Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Expression Reference Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "meta": {
    "instanceId": "408f9fb9940c3cb18ffdef0e0150fe342d6e655c3a9fac21f0f644e8bedabcd9"
  },
  "nodes": [
    {
      "id": "201ef455-2d65-4563-8ec1-318211b1fa6a",
      "name": "Get Message Contents",
      "type": "n8n-nodes-base.gmail",
      "position": [
        2080,
        500
      ],
      "webhookId": "fa1d496f-17fa-4e50-bae9-84ca85ed4502",
      "parameters": {
        "simple": false,
        "options": {},
        "messageId": "={{ $json.id }}",
        "operation": "get"
      },
      "credentials": {
        "gmailOAuth2": {
          "id": "Sf5Gfl9NiFTNXFWb",
          "name": "Gmail account"
        }
      },
      "typeVersion": 2.1
    },
    {
      "id": "ded010af-e977-4c47-87dd-8221d601af74",
      "name": "Simplify Emails",
      "type": "n8n-nodes-base.set",
      "position": [
        2240,
        500
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "2006c806-42db-4457-84c2-35f59ed39018",
              "name": "date",
              "type": "string",
              "value": "={{ $json.date }}"
            },
            {
              "id": "872278d2-b97c-45ba-a9d3-162f154fe7dc",
              "name": "subject",
              "type": "string",
              "value": "={{ $json.subject }}"
            },
            {
              "id": "282f03e9-1d0f-4a17-b9ed-75b44171d4ee",
              "name": "text",
              "type": "string",
              "value": "={{ $json.text }}"
            },
            {
              "id": "9421776c-ff53-4490-b0e1-1e610534ba25",
              "name": "from",
              "type": "string",
              "value": "={{ $json.from.value[0].name }} ({{ $json.from.value[0].address }})"
            },
            {
              "id": "3b6716e8-5582-4da3-ae9d-e8dd1afad530",
              "name": "to",
              "type": "string",
              "value": "={{ $json.to.value[0].name }} ({{ $json.to.value[0]...

Output:
In node 'Sticky Note9', the parameter 'content' contains an expression that references undefined data.

**Faulty Expression**: `={{ $node.NonExistentNode.json.data }}`
**Original Value**: `## 3.5: Extract LinkedIn Profile & Recent Activity
[Learn more about the HTML node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.html)

Once we have our scraped LinkedIn profile, it's just a simple case of parsing and extracting the relevant sections from the page.
For the purpose of our workflow, we'll only need the "About" and "Activity" sections which we'll pull out of the page using a series of HTML nodes. Feel free to extract other sections to suit your needs! Once extracted, we'll combine the about and activities data in preparation of sending it to our LLM.`

**Root Cause**: The expression references a field, node, or variable that doesn't exist in the data flow.

**Debugging Steps**:
1. Check the output of previous nodes to verify available fields
2. Use the Expression Editor to test expressions interactively
3. Add a Set node before this one to inspect available data
4. Use optional chaining for potentially undefined fields: `$json.field?.subfield`

**Best Practice**: Always validate data availability before using expressions.

Fix the expression in 'Sticky Note9' parameter 'content'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Expression Reference Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "meta": {
    "instanceId": "408f9fb9940c3cb18ffdef0e0150fe342d6e655c3a9fac21f0f644e8bedabcd9"
  },
  "nodes": [
    {
      "id": "77ee6494-4898-47dc-81d9-35daf6f0beea",
      "name": "WhatsApp Trigger",
      "type": "n8n-nodes-base.whatsAppTrigger",
      "position": [
        1360,
        -280
      ],
      "webhookId": "aaa71f03-f7af-4d18-8d9a-0afb86f1b554",
      "parameters": {
        "updates": [
          "messages"
        ]
      },
      "credentials": {
        "whatsAppTriggerApi": {
          "id": "H3uYNtpeczKMqtYm",
          "name": "WhatsApp OAuth account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "57210e27-1f89-465a-98cc-43f890a4bf58",
      "name": "OpenAI Chat Model",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        1960,
        -200
      ],
      "parameters": {
        "model": "gpt-4o-2024-08-06",
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "id": "8gccIjcuf3gvaoEr",
          "name": "OpenAi account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "e1053235-0ade-4e36-9ad2-8b29c78fced8",
      "name": "Window Buffer Memory",
      "type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
      "position": [
        2080,
        -200
      ],
      "parameters": {
        "sessionKey": "=whatsapp-75-{{ $json.messages[0].from }}",
        "sessionIdType": "customKey"
      },
      "typeVersion": 1.2
    },
    {
      "id": "69f1b78b-7c93-4713-863a-27e04809996f",
      "name": "Vector Store Tool",
      "type": "@n8n/n8n-nodes-langchain.toolVectorStore",
      "position": [
        2200,
        -200
      ],
      "parameters": {
        "name": "query_product_brochure",
        "description": "Call this tool to query the product brochure. Valid for the year 2024."
      },
      "typeVersion": 1
    },
    {
      "id": "170e8f7d-7e14-48dd-9f80-5352cc411fc1",
      "name": "Embeddings OpenAI",
      "type": "@n8n/n8...

Output:
In node 'Sticky Note8', the parameter 'content' contains an expression that references undefined data.

**Faulty Expression**: `={{ $env.UNDEFINED_ENV_VAR }}`
**Original Value**: `### You only have to run this part once!
Run this step to populate our product catalogue vector. Run again if you want to update the vector store with a new version.`

**Root Cause**: The expression references a field, node, or variable that doesn't exist in the data flow.

**Debugging Steps**:
1. Check the output of previous nodes to verify available fields
2. Use the Expression Editor to test expressions interactively
3. Add a Set node before this one to inspect available data
4. Use optional chaining for potentially undefined fields: `$json.field?.subfield`

**Best Practice**: Always validate data availability before using expressions.

Fix the expression in 'Sticky Note8' parameter 'content'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Missing Credentials

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "id": "APCp9GPNjUSFPSfJ",
  "meta": {
    "instanceId": "a4bfc93e975ca233ac45ed7c9227d84cf5a2329310525917adaf3312e10d5462",
    "templateCredsSetupCompleted": true
  },
  "name": "Business WhatsApp AI RAG Chatbot",
  "tags": [],
  "nodes": [
    {
      "id": "2c5b2dd1-c63f-4bc9-909e-5f4b2a385d01",
      "name": "Respond to Webhook",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
        1020,
        1040
      ],
      "parameters": {
        "options": {},
        "respondWith": "text",
        "responseBody": "={{ $json.query['hub.challenge'] }}"
      },
      "typeVersion": 1.1
    },
    {
      "id": "cc230fcd-f88c-40d4-8835-ac9dc6228b18",
      "name": "AI Agent",
      "type": "@n8n/n8n-nodes-langchain.agent",
      "position": [
        1560,
        1380
      ],
      "parameters": {
        "text": "={{ $('Respond').item.json.body.entry[0].changes[0].value.messages[0].text.body }}",
        "agent": "conversationalAgent",
        "options": {
          "systemMessage": "You are an AI-powered assistant for an electronics store. Your primary goal is to assist customers by providing accurate and helpful information about products, troubleshooting tips, and general support. Use the provided knowledge base (retrieved documents) to answer questions with precision and professionalism.\n\n**Guidelines**:\n1. **Product Information**:\n - Provide detailed descriptions of products, including specifications, features, and compatibility.\n - Highlight key selling points and differences between similar products.\n - Mention availability, pricing, and promotions if applicable.\n\n2. **Technical Support**:\n - Offer step-by-step troubleshooting guides for common issues.\n - Suggest solutions for setup, installation, or configuration problems.\n - If the issue is complex, recommend contacting the store\u2019s support team for further assistance.\n\n3. **Customer Service**:\n - Respond politely and professionally to all inquiries.\n - If a ques...

Output:
The node 'Refresh collection' (type: n8n-nodes-base.httpRequest) requires credentials but the 'credentials' configuration is missing.

**Root Cause**: The credentials object was not defined for this node.

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "httpHeaderAuth": {
    "id": "qhny6r5ql9wwotpn",
    "name": "Qdrant API (Hetzner)"
  }
}
```

**Best Practice**: Always verify credentials are properly configured before deploying workflows. Use n8n's credential management system to store sensitive data securely.

Add credentials configuration to the 'Refresh collection' node.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "meta": {
    "instanceId": "408f9fb9940c3cb18ffdef0e0150fe342d6e655c3a9fac21f0f644e8bedabcd9"
  },
  "nodes": [
    {
      "id": "38ffe41a-ecdf-4bb4-bd55-51998abab0f5",
      "name": "WhatsApp Trigger",
      "type": "n8n-nodes-base.whatsAppTrigger",
      "position": [
        220,
        300
      ],
      "webhookId": "0b1b3a9b-2f6a-4f5a-8385-6365d96f4802",
      "parameters": {
        "updates": [
          "messages"
        ]
      },
      "credentials": {
        "whatsAppTriggerApi": {
          "id": "H3uYNtpeczKMqtYm",
          "name": "WhatsApp OAuth account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "a35ac268-eff0-46cd-ac4e-c9b047a3f893",
      "name": "Get Audio URL",
      "type": "n8n-nodes-base.whatsApp",
      "position": [
        1020,
        -160
      ],
      "parameters": {
        "resource": "media",
        "operation": "mediaUrlGet",
        "mediaGetId": "={{ $json.audio.id }}",
        "requestOptions": {}
      },
      "credentials": {
        "whatsAppApi": {
          "id": "9SFJPeqrpChOkAmw",
          "name": "WhatsApp account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "a3be543c-949c-4443-bf82-e0d00419ae23",
      "name": "Get Video URL",
      "type": "n8n-nodes-base.whatsApp",
      "position": [
        1020,
        200
      ],
      "parameters": {
        "resource": "media",
        "operation": "mediaUrlGet",
        "mediaGetId": "={{ $json.video.id }}",
        "requestOptions": {}
      },
      "credentials": {
        "whatsAppApi": {
          "id": "9SFJPeqrpChOkAmw",
          "name": "WhatsApp account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "dd3cd0e7-0d1e-40cf-8120-aba0d1646d6d",
      "name": "Get Image URL",
      "type": "n8n-nodes-base.whatsApp",
      "position": [
        1020,
        540
      ],
      "parameters": {
        "resource": "media",
        "operation": "mediaUrlGet",
        "mediaGetId": "={{ $json.imag...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.

Add validation for empty or null input data.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Data Type Mismatch

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "id": "caaf1WFANPKAikiH",
  "meta": {
    "instanceId": "558d88703fb65b2d0e44613bc35916258b0f0bf983c5d4730c00c424b77ca36a",
    "templateCredsSetupCompleted": true
  },
  "name": "Auto categorize wordpress template",
  "tags": [],
  "nodes": [
    {
      "id": "2017403c-7496-48f8-a487-8a017c7adfe3",
      "name": "When clicking \u2018Test workflow\u2019",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        680,
        320
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "82ff288f-4234-4192-9046-33e5ffee5264",
      "name": "Wordpress",
      "type": "n8n-nodes-base.wordpress",
      "position": [
        1500,
        320
      ],
      "parameters": {
        "postId": "={{ $('Get All Wordpress Posts').item.json.id }}",
        "operation": "update",
        "updateFields": {
          "categories": "={{ $json.output }}"
        }
      },
      "credentials": {
        "wordpressApi": {
          "id": "lGWPwxTdfPDDbFjj",
          "name": "Rumjahn.com wordpress"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "521deb22-62dd-4b5f-8b9a-aab9777821da",
      "name": "Sticky Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        620,
        -100
      ],
      "parameters": {
        "width": 504.88636363636317,
        "content": "## How to Auto-Categorize 82 Blog Posts in 2 Minutes using A.I. (No Coding Required)\n\n\ud83d\udca1 Read the [case study here](https://rumjahn.com/how-to-use-a-i-to-categorize-wordpress-posts-and-streamline-your-content-organization-process/).\n\n\ud83d\udcfa Watch the [youtube tutorial here](https://www.youtube.com/watch?v=IvQioioVqhw)\n\n"
      },
      "typeVersion": 1
    },
    {
      "id": "4090d827-f8cd-47ef-ad4f-654ee58216f6",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        860,
        180
      ],
      "parameters": {
        "color": 3,
        "width": 188.14814814814804,...

Output:
The node 'Get All Wordpress Posts' has a data type mismatch in its parameters.

**Issue**: A field expected a number but received a string value.

**Common Causes**:
1. Expression returns string instead of number
2. JSON parsing preserves string types for numeric values
3. Upstream node outputs different data types than expected

**Solutions**:

1. **Type Conversion in Expression**:
```javascript
// Convert string to number
{ parseInt($json.stringValue) }
{ parseFloat($json.decimalString) }
{ Number($json.value) }
```

2. **Use Code Node for Transformation**:
```javascript
return items.map(item => {
  item.json.numericField = Number(item.json.stringField);
  return item;
});
```

3. **Validate Data Types**:
- Use IF node to check types before processing
- Add error handling for invalid types

**Best Practice**: Always validate and transform data types explicitly when passing data between nodes.

Fix data type conversion in 'Get All Wordpress Posts'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "id": "siXUnQhJpCJ9rHzu",
  "meta": {
    "instanceId": "a9f3b18652ddc96459b459de4fa8fa33252fb820a9e5a1593074f3580352864a",
    "templateCredsSetupCompleted": true
  },
  "name": "Auto-Tag Blog Posts in WordPress with AI",
  "tags": [
    {
      "id": "ijuVOmJpw5mCrzQX",
      "name": "marketing",
      "createdAt": "2025-01-28T16:42:03.029Z",
      "updatedAt": "2025-01-28T16:42:03.029Z"
    }
  ],
  "nodes": [
    {
      "id": "0561d80b-f360-4a8e-930d-49b778833991",
      "name": "OpenAI Chat Model",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        3260,
        480
      ],
      "parameters": {
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "id": "yWpagxp5s8o3dlBp",
          "name": "OpenAi account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "d71aec64-299c-4258-8eb4-95821d15b758",
      "name": "Auto-fixing Output Parser",
      "type": "@n8n/n8n-nodes-langchain.outputParserAutofixing",
      "position": [
        3460,
        540
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "1468a001-ca7b-4726-ae31-02b28d78b07e",
      "name": "OpenAI Chat Model1",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        3360,
        680
      ],
      "parameters": {
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "id": "yWpagxp5s8o3dlBp",
          "name": "OpenAi account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "bb4221ad-94d7-4543-850f-87b83735d2a6",
      "name": "Structured Output Parser",
      "type": "@n8n/n8n-nodes-langchain.outputParserStructured",
      "position": [
        3560,
        760
      ],
      "parameters": {
        "jsonSchemaExample": "{\n\t\"tags\": [\"Germany\", \"Technology\", \"Workflow Automation\"]\n}"
      },
      "typeVersion": 1.2
    },
    {
      "id": "2380c4ea-d804-45b2-8341-417afa2ae21f",
      "name": ...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "nodes": [
    {
      "id": "d3159589-dbb7-4cca-91f5-09e8b2e4cba8",
      "name": "When clicking \u2018Test workflow\u2019",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        240,
        500
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "b4b42b3f-ef30-4fc8-829d-59f8974c4168",
      "name": "OpenAI Chat Model",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        2180,
        700
      ],
      "parameters": {
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "id": "8gccIjcuf3gvaoEr",
          "name": "OpenAi account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "032c3012-ed8d-44eb-94f0-35790f4b616f",
      "name": "OpenAI Chat Model1",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        2980,
        460
      ],
      "parameters": {
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "id": "8gccIjcuf3gvaoEr",
          "name": "OpenAi account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "bf922785-7e8f-4f93-bfff-813c16d93278",
      "name": "OpenAI Chat Model2",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        2020,
        520
      ],
      "parameters": {
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "id": "8gccIjcuf3gvaoEr",
          "name": "OpenAi account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "d8d4b26f-270f-4b39-a4cd-a6e4361da591",
      "name": "Extract Voice Characteristics",
      "type": "@n8n/n8n-nodes-langchain.informationExtractor",
      "position": [
        2160,
        540
      ],
      "parameters": {
        "text": "=### Analyse the given content\n\n{{ $json.data.map(item => item.replace(/\\n/g, '')).join('\\n---\\n') }}",
        "options": {
          "systemPromptTemplate": "You help identify and...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "id": "p5bfwpcRy6LK33Io",
  "meta": {
    "instanceId": "a4bfc93e975ca233ac45ed7c9227d84cf5a2329310525917adaf3312e10d5462",
    "templateCredsSetupCompleted": true
  },
  "name": "Automate Content Generator for WordPress with DeepSeek R1",
  "tags": [],
  "nodes": [
    {
      "id": "c4a6995f-7769-4b77-80ca-1e6bccef77c1",
      "name": "When clicking \u2018Test workflow\u2019",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        -20,
        200
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "c76b1458-5130-41e7-b2f2-1cfe22eab536",
      "name": "Get Ideas",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        200,
        200
      ],
      "parameters": {
        "options": {},
        "sheetName": {
          "__rl": true,
          "mode": "id",
          "value": "=Sheet1"
        },
        "documentId": {
          "__rl": true,
          "mode": "id",
          "value": "YOURDOCUMENT"
        }
      },
      "credentials": {
        "googleSheetsOAuth2Api": {
          "id": "JYR6a64Qecd6t8Hb",
          "name": "Google Sheets account"
        }
      },
      "typeVersion": 4.5
    },
    {
      "id": "8d17a640-3e15-42e9-9481-e3291d395ccd",
      "name": "Set your prompt",
      "type": "n8n-nodes-base.set",
      "position": [
        420,
        200
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "3e8d2523-66aa-46fe-adcc-39dc78b9161e",
              "name": "prompt",
              "type": "string",
              "value": "={{ $json.PROMPT }}"
            }
          ]
        }
      },
      "typeVersion": 3.4
    },
    {
      "id": "4f0e9065-b331-49ed-acd9-77c7c43e89a5",
      "name": "Create post on Wordpress",
      "type": "n8n-nodes-base.wordpress",
      "position": [
        0,
        500
      ],
      "parameters": {
        "title": "={{ $json.message.content }}",
     ...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Data Type Mismatch

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "id": "o8iTqIh2sVvnuWz5",
  "meta": {
    "instanceId": "b9faf72fe0d7c3be94b3ebff0778790b50b135c336412d28fd4fca2cbbf8d1f5"
  },
  "name": "RAG & GenAI App With WordPress Content",
  "tags": [],
  "nodes": [
    {
      "id": "c3738490-ed39-4774-b337-bf5ee99d0c72",
      "name": "When clicking \u2018Test workflow\u2019",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        500,
        940
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "3ab719bd-3652-433f-a597-9cd28f8cfcea",
      "name": "Embeddings OpenAI",
      "type": "@n8n/n8n-nodes-langchain.embeddingsOpenAi",
      "position": [
        2580,
        1320
      ],
      "parameters": {
        "model": "text-embedding-3-small",
        "options": {}
      },
      "typeVersion": 1
    },
    {
      "id": "e8639569-2091-44de-a84d-c3fc3ce54de4",
      "name": "Default Data Loader",
      "type": "@n8n/n8n-nodes-langchain.documentDefaultDataLoader",
      "position": [
        2800,
        1260
      ],
      "parameters": {
        "options": {
          "metadata": {
            "metadataValues": [
              {
                "name": "title",
                "value": "={{ $json.title }}"
              },
              {
                "name": "url",
                "value": "={{ $json.url }}"
              },
              {
                "name": "content_type",
                "value": "={{ $json.content_type }}"
              },
              {
                "name": "publication_date",
                "value": "={{ $json.publication_date }}"
              },
              {
                "name": "modification_date",
                "value": "={{ $json.modification_date }}"
              },
              {
                "name": "id",
                "value": "={{ $json.id }}"
              }
            ]
          }
        },
        "jsonData": "={{ $json.data }}",
        "jsonMode": "expressionData"
      },
      "typeVersion": 1
...

Output:
The node 'Supabase Vector Store' has a data type mismatch in its parameters.

**Issue**: A field expected a number but received a string value.

**Common Causes**:
1. Expression returns string instead of number
2. JSON parsing preserves string types for numeric values
3. Upstream node outputs different data types than expected

**Solutions**:

1. **Type Conversion in Expression**:
```javascript
// Convert string to number
{ parseInt($json.stringValue) }
{ parseFloat($json.decimalString) }
{ Number($json.value) }
```

2. **Use Code Node for Transformation**:
```javascript
return items.map(item => {
  item.json.numericField = Number(item.json.stringField);
  return item;
});
```

3. **Validate Data Types**:
- Use IF node to check types before processing
- Add error handling for invalid types

**Best Practice**: Always validate and transform data types explicitly when passing data between nodes.

Fix data type conversion in 'Supabase Vector Store'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Missing Credentials

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "id": "mKGMYXJottl0PDtM",
  "meta": {
    "instanceId": "cb484ba7b742928a2048bf8829668bed5b5ad9787579adea888f05980292a4a7"
  },
  "name": "Write a WordPress post with AI (starting from a few keywords)",
  "tags": [],
  "nodes": [
    {
      "id": "a4f19a81-6101-48c2-9560-9cf231bc240b",
      "name": "Form",
      "type": "n8n-nodes-base.formTrigger",
      "position": [
        -580,
        320
      ],
      "webhookId": "4b937814-e829-4df7-aaba-31192babf7e1",
      "parameters": {
        "path": "create-wordpress-post",
        "formTitle": "Create a WordPress post with AI",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Keywords (comma-separated)",
              "requiredField": true
            },
            {
              "fieldType": "dropdown",
              "fieldLabel": "Number of chapters",
              "fieldOptions": {
                "values": [
                  {
                    "option": "1"
                  },
                  {
                    "option": "2"
                  },
                  {
                    "option": "3"
                  },
                  {
                    "option": "4"
                  },
                  {
                    "option": "5"
                  },
                  {
                    "option": "6"
                  },
                  {
                    "option": "7"
                  },
                  {
                    "option": "8"
                  },
                  {
                    "option": "9"
                  },
                  {
                    "option": "10"
                  }
                ]
              },
              "requiredField": true
            },
            {
              "fieldType": "number",
              "fieldLabel": "Max words count",
              "requiredField": true
            }
          ]
        },
        "responseMode": "responseNode",
        "formDescription": "Fi...

Output:
The node 'Set image ID for the post' (type: n8n-nodes-base.httpRequest) requires credentials but the 'credentials' configuration is missing.

**Root Cause**: The credentials object was not defined for this node.

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "wordpressApi": {
    "id": "xxxxxxxxxxx",
    "name": "WordPress Credentials"
  }
}
```

**Best Practice**: Always verify credentials are properly configured before deploying workflows. Use n8n's credential management system to store sensitive data securely.

Add credentials configuration to the 'Set image ID for the post' node.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "AI Overview Analyzer",
  "nodes": [
    {
      "parameters": {
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.chatTrigger",
      "typeVersion": 1.3,
      "position": [
        0,
        0
      ],
      "id": "72ac6c8d-a373-4d71-849a-75ed6716b9b1",
      "name": "When chat message received",
      "webhookId": "715bcc67-a6b6-4334-8141-83c123f35917"
    },
    {
      "parameters": {
        "contextWindowLength": 10
      },
      "type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
      "typeVersion": 1.3,
      "position": [
        304,
        240
      ],
      "id": "f16346fd-e166-4d5e-973e-0db4412d20e6",
      "name": "Simple Memory"
    },
    {
      "parameters": {
        "model": {
          "__rl": true,
          "value": "gpt-4.1",
          "mode": "list",
          "cachedResultName": "gpt-4.1"
        },
        "options": {
          "temperature": 0
        }
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "typeVersion": 1.2,
      "position": [
        144,
        240
      ],
      "id": "7887d008-b881-4387-91cb-cd824bbd553f",
      "name": "GPT-4.1",
      "credentials": {
        "openAiApi": {
          "id": "RAj3VxCHt0rIwBTk",
          "name": "OpenAI"
        }
      }
    },
    {
      "parameters": {
        "description": "Call this tool to get the AI Overview from Google.",
        "workflowId": {
          "__rl": true,
          "value": "4ViOjawp2E5PbJsu",
          "mode": "list",
          "cachedResultName": "Analyze AI Overview"
        },
        "workflowInputs": {
          "mappingMode": "defineBelow",
          "value": {
            "gl": "={{ $fromAI('country') }}",
            "q": "={{ $fromAI('query') }}",
            "location": "={{ $fromAI('location') }}",
            "hl": "={{ $fromAI('host_language') }}"
          },
          "matchingColumns": [],
          "schema": [
            {
              "id": "gl",
              "displayName": "gl",...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Expression Reference Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Analyze AI Overview",
  "nodes": [
    {
      "parameters": {
        "workflowInputs": {
          "values": [
            {
              "name": "gl"
            },
            {
              "name": "q"
            },
            {
              "name": "location"
            },
            {
              "name": "hl"
            }
          ]
        }
      },
      "type": "n8n-nodes-base.executeWorkflowTrigger",
      "typeVersion": 1.1,
      "position": [
        -624,
        320
      ],
      "id": "1fadcfb7-077e-43f2-810c-27be1c0f6575",
      "name": "When Executed by Another Workflow"
    },
    {
      "parameters": {
        "url": "https://serpapi.com/search",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "serpApi",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "gl",
              "value": "={{ $json.gl }}"
            },
            {
              "name": "q",
              "value": "={{ $json.q }}"
            },
            {
              "name": "location",
              "value": "={{ $json.location }}"
            },
            {
              "name": "hl",
              "value": "={{ $json.hl }}"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -400,
        320
      ],
      "id": "a66d8866-4e88-4216-8de2-d78bda030c61",
      "name": "GET SERP Results",
      "retryOnFail": true,
      "waitBetweenTries": 5000,
      "credentials": {
        "serpApi": {
          "id": "ip84lDL75JMRWLKs",
          "name": "SerpAPI Account"
        }
      }
    },
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "d8cbb599-3ec7-446b-be55-9f48e21b4d11",
              "name": "=serpapi_link",
              "value": "={{ $json.ai_overview.serpapi_link }}...

Output:
In node 'Merge Results', the parameter 'combineBy' contains an expression that references undefined data.

**Faulty Expression**: `={{ $json["non_existent_field"] }}`
**Original Value**: `combineAll`

**Root Cause**: The expression references a field, node, or variable that doesn't exist in the data flow.

**Debugging Steps**:
1. Check the output of previous nodes to verify available fields
2. Use the Expression Editor to test expressions interactively
3. Add a Set node before this one to inspect available data
4. Use optional chaining for potentially undefined fields: `$json.field?.subfield`

**Best Practice**: Always validate data availability before using expressions.

Fix the expression in 'Merge Results' parameter 'combineBy'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Rate Limiting Risk

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "AI Overview Optimizer",
  "nodes": [
    {
      "parameters": {
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.chatTrigger",
      "typeVersion": 1.3,
      "position": [
        0,
        0
      ],
      "id": "5bd86f24-dc44-422b-af64-9d48f2e75b97",
      "name": "When chat message received",
      "webhookId": "0ee028e9-419a-413a-a3f5-43ad95498ffa"
    },
    {
      "parameters": {
        "contextWindowLength": 10
      },
      "type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
      "typeVersion": 1.3,
      "position": [
        192,
        240
      ],
      "id": "8224aa60-4aaf-4157-9367-4b9bfd7bc5d4",
      "name": "Simple Memory"
    },
    {
      "parameters": {
        "model": {
          "__rl": true,
          "value": "gpt-4.1",
          "mode": "list",
          "cachedResultName": "gpt-4.1"
        },
        "options": {
          "temperature": 0
        }
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "typeVersion": 1.2,
      "position": [
        32,
        240
      ],
      "id": "a3c53901-3ffd-4bf9-849a-e525d8c6cb3c",
      "name": "GPT-4.1",
      "credentials": {
        "openAiApi": {
          "id": "RAj3VxCHt0rIwBTk",
          "name": "OpenAI"
        }
      }
    },
    {
      "parameters": {
        "description": "Call this tool to get the AI Overview from Google.",
        "workflowId": {
          "__rl": true,
          "value": "4ViOjawp2E5PbJsu",
          "mode": "list",
          "cachedResultName": "Analyze AI Overview"
        },
        "workflowInputs": {
          "mappingMode": "defineBelow",
          "value": {
            "gl": "={{ $fromAI('country') }}",
            "q": "={{ $fromAI('query') }}",
            "location": "={{ $fromAI('location') }}",
            "hl": "={{ $fromAI('host_language') }}"
          },
          "matchingColumns": [],
          "schema": [
            {
              "id": "gl",
              "displayName": "gl",...

Output:
This workflow may encounter rate limiting issues when processing large batches of data.

**Common Rate Limit Errors**:
- HTTP 429 Too Many Requests
- HTTP 503 Service Unavailable
- API-specific rate limit messages

**Root Cause**: The workflow makes too many API requests in a short time period without delays.

**Solutions**:

1. **Add Wait Nodes**: Insert a Wait node between API calls
```json
{
  "parameters": {"amount": 1, "unit": "seconds"},
  "name": "Rate Limit Delay",
  "type": "n8n-nodes-base.wait"
}
```

2. **Enable Retry on Fail**:
```json
"retryOnFail": true,
"maxTries": 3,
"waitBetweenTries": 5000
```

3. **Use Batch Processing**: Split items into smaller batches with delays

4. **Implement Exponential Backoff**: Increase wait times with each retry

**Best Practice**: Always check API documentation for rate limits and implement appropriate throttling.

Add rate limiting protection with Wait nodes and retry logic.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Disconnected Node

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Analyze AI Overview",
  "nodes": [
    {
      "parameters": {
        "workflowInputs": {
          "values": [
            {
              "name": "gl"
            },
            {
              "name": "q"
            },
            {
              "name": "location"
            },
            {
              "name": "hl"
            }
          ]
        }
      },
      "type": "n8n-nodes-base.executeWorkflowTrigger",
      "typeVersion": 1.1,
      "position": [
        -624,
        320
      ],
      "id": "1fadcfb7-077e-43f2-810c-27be1c0f6575",
      "name": "When Executed by Another Workflow"
    },
    {
      "parameters": {
        "url": "https://serpapi.com/search",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "serpApi",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "gl",
              "value": "={{ $json.gl }}"
            },
            {
              "name": "q",
              "value": "={{ $json.q }}"
            },
            {
              "name": "location",
              "value": "={{ $json.location }}"
            },
            {
              "name": "hl",
              "value": "={{ $json.hl }}"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -400,
        320
      ],
      "id": "a66d8866-4e88-4216-8de2-d78bda030c61",
      "name": "GET SERP Results",
      "retryOnFail": true,
      "waitBetweenTries": 5000,
      "credentials": {
        "serpApi": {
          "id": "ip84lDL75JMRWLKs",
          "name": "SerpAPI Account"
        }
      }
    },
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "d8cbb599-3ec7-446b-be55-9f48e21b4d11",
              "name": "=serpapi_link",
              "value": "={{ $json.ai_overview.serpapi_link }}...

Output:
The workflow has a broken data flow. The node 'Get AI Overview Content' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for 'Get AI Overview Content'.

**Impact**: Data from 'Get AI Overview Content' will not flow to any downstream nodes, effectively stopping the workflow at this point.

**Solution**:
1. Open the workflow in the n8n editor
2. Draw a connection from 'Get AI Overview Content' to the next node in the flow
3. Verify the connection appears in the connections object

**Programmatic Fix**: Add the connection back to the workflow JSON:
```json
"connections": {
  "Get AI Overview Content": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```

Reconnect 'Get AI Overview Content' to the workflow.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Timeout Configuration

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Tool - Serper Crawl URL",
  "nodes": [
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "7320f474-4ba6-47b7-9ce7-82529cbb12ff",
              "name": "title",
              "value": "={{ $json.metadata.title }}",
              "type": "string"
            },
            {
              "id": "a047ca1d-04e0-493b-9d88-eddc4ec4478c",
              "name": "description",
              "value": "={{ $json.metadata.description }}",
              "type": "string"
            },
            {
              "id": "607f18e4-364c-4594-8821-3800b28d3c9b",
              "name": "markdown",
              "value": "={{ $json.markdown }}",
              "type": "string"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.set",
      "typeVersion": 3.4,
      "position": [
        288,
        0
      ],
      "id": "635191a6-85dc-439d-8616-ceabb5294a71",
      "name": "Get Metadata"
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://scrape.serper.dev",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "url",
              "value": "={{ $json.url }}"
            },
            {
              "name": "includeMarkdown",
              "value": "true"
            }
          ]
        },
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        64,
        0
      ],
      "id": "b53e65c6-0b22-4b89-b718-32143058205e",
      "name": "Serper",
      "credentials": {
        "httpHeaderAuth"...

Output:
This workflow may experience timeout issues with long-running API requests.

**Symptoms**:
- Execution hangs indefinitely
- Connection timeout errors
- ETIMEDOUT or ESOCKETTIMEDOUT errors

**Root Cause**: No timeout configured for HTTP requests, or external services are slow.

**Solutions**:

1. **Set Appropriate Timeouts**:
```json
"options": {
  "timeout": 30000  // 30 seconds
}
```

2. **Add Error Handling**:
- Use Error Trigger node to catch timeout errors
- Implement fallback logic for failed requests

3. **Use Async Patterns**:
- For long operations, use webhook callbacks
- Implement polling patterns instead of waiting

4. **Configure Node Settings**:
```json
"retryOnFail": true,
"maxTries": 3,
"waitBetweenTries": 2000,
"continueOnFail": true
```

**Best Practice**: Set reasonable timeouts (10-30 seconds) and always have error handling for external API calls.

Configure appropriate timeouts and error handling for HTTP requests.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Data Type Mismatch

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Product - Google Search Console API Examples",
  "nodes": [
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        -1000,
        200
      ],
      "id": "5d1adc86-fe51-412e-8aea-cbaf4e9cf708",
      "name": "When clicking \u2018Test workflow\u2019"
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://searchconsole.googleapis.com/v1/urlInspection/index:inspect",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "googleOAuth2Api",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "{\n  \"inspectionUrl\": \"https://your-domain.com/slug/\",\n  \"siteUrl\": \"https://your-domain.com/\"\n}",
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -400,
        340
      ],
      "id": "561fd96f-17af-45d5-90ac-a8f14e833d35",
      "name": "Inspect URL",
      "credentials": {
        "googleOAuth2Api": {
          "id": "R0UFaLH10cOpcIL4",
          "name": "Google account"
        }
      }
    },
    {
      "parameters": {
        "content": "## Inspect URLs",
        "height": 240,
        "width": 260
      },
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        -460,
        260
      ],
      "id": "48d24e88-5869-4d91-b3a4-97ecad871d4c",
      "name": "Sticky Note"
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://searchconsole.googleapis.com/webmasters/v3/sites/sc-domain:your-domain.com/searchAnalytics/query",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "googleOAuth2Api",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "{\n  \"startDate\": \"2025-02-26\",\n  \"endDate\": \"2025-03-26\",\n  \"dimensions\": [\"device\"],\n  \"rowLimit\": 5000\n}",
        "options": {}
     ...

Output:
The node 'Sticky Note4' has a data type mismatch in its parameters.

**Issue**: A field expected a number but received a string value.

**Common Causes**:
1. Expression returns string instead of number
2. JSON parsing preserves string types for numeric values
3. Upstream node outputs different data types than expected

**Solutions**:

1. **Type Conversion in Expression**:
```javascript
// Convert string to number
{ parseInt($json.stringValue) }
{ parseFloat($json.decimalString) }
{ Number($json.value) }
```

2. **Use Code Node for Transformation**:
```javascript
return items.map(item => {
  item.json.numericField = Number(item.json.stringField);
  return item;
});
```

3. **Validate Data Types**:
- Use IF node to check types before processing
- Add error handling for invalid types

**Best Practice**: Always validate and transform data types explicitly when passing data between nodes.

Fix data type conversion in 'Sticky Note4'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Data-driven SEO Optimization",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Form",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Link",
              "requiredField": true
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.2,
      "position": [
        -500,
        280
      ],
      "id": "ba0f4b1f-40be-4c8b-86a8-b880960224d4",
      "name": "On form submission",
      "webhookId": "c0791596-ada8-407c-9669-f54396d88940"
    },
    {
      "parameters": {
        "method": "POST",
        "url": "http://crawl4ai:11235/crawl",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendBody": true,
        "bodyParameters": {
          "parameters": [
            {
              "name": "urls",
              "value": "={{ $json.Link }}"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -280,
        60
      ],
      "id": "1b6e074c-b5f3-4fd2-a6c0-b0d2d1f9275d",
      "name": "get_article_content"
    },
    {
      "parameters": {},
      "type": "n8n-nodes-base.wait",
      "typeVersion": 1.1,
      "position": [
        -80,
        60
      ],
      "id": "435d5eb7-f2a2-4b2e-ad27-712e7fd304b7",
      "name": "5_sec",
      "webhookId": "ac0bb2e9-a1f8-47df-823b-074a0e825f6c"
    },
    {
      "parameters": {
        "url": "=http://crawl4ai:11235/task/{{ $json.task_id }}",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        60,
        60
      ],
      "id": "5f582f3d-616d-433b-9b62-d1c646dea679",
      "name": "get_status"
    },
    {
      "parameters": {
        "condit...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "keyword_rank_tracker_google_sheets",
  "nodes": [
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        260,
        820
      ],
      "id": "8acb9df9-dae5-41ec-b899-0cfb7c3853ea",
      "name": "When clicking \u2018Test workflow\u2019"
    },
    {
      "parameters": {
        "documentId": {
          "__rl": true,
          "value": "1AJRIe-IROQGRtqlBqeiyVP5ayjSlfOMC_nFDGwwLULU",
          "mode": "list",
          "cachedResultName": "tracked_keywords",
          "cachedResultUrl": "https://docs.google.com/spreadsheets/d/1AJRIe-IROQGRtqlBqeiyVP5ayjSlfOMC_nFDGwwLULU/edit?usp=drivesdk"
        },
        "sheetName": {
          "__rl": true,
          "value": "={{ $json.domain }}",
          "mode": "name"
        },
        "options": {}
      },
      "type": "n8n-nodes-base.googleSheets",
      "typeVersion": 4.5,
      "position": [
        1340,
        280
      ],
      "id": "86f7ea65-9942-4886-9516-21553ac7a460",
      "name": "Get Tracked Keywords"
    },
    {
      "parameters": {
        "jsCode": "return [{\n  json: {\n    keywordString: $input.all().map(item => `'${item.json.keywords}'`).join(', ')\n  }\n}];"
      },
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        1580,
        280
      ],
      "id": "3ca647b4-2613-4b31-b1da-9724911380ca",
      "name": "Code"
    },
    {
      "parameters": {
        "projectId": {
          "__rl": true,
          "value": "automations-451008",
          "mode": "list",
          "cachedResultName": "automations",
          "cachedResultUrl": "https://console.cloud.google.com/bigquery?project=automations-451008"
        },
        "sqlQuery": "WITH daily_metrics AS (\n  SELECT \n    data_date as date,\n    query as keyword,\n    url,\n    device,\n    SUM(clicks) as clicks,\n    SUM(impressions) as impressions,\n    ROUND(AVG(sum_position / impressions), 1) as position,\n    ROUND...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Timeout Configuration

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Landing Page Analyzer",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Landing Page Analyzer",
        "formFields": {
          "values": [
            {
              "fieldLabel": "URL",
              "requiredField": true
            },
            {
              "fieldLabel": "Email",
              "fieldType": "email",
              "requiredField": true
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.3,
      "position": [
        -304,
        -112
      ],
      "id": "bc0c4d73-ee5d-4dd0-8d0a-e0bfb62d020f",
      "name": "On form submission",
      "webhookId": "750d8a3a-997e-49ae-bd76-010ee665cde9"
    },
    {
      "parameters": {
        "url": "={{ $('Get Meta Data').item.json.page.screenshot }}",
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        1168,
        -112
      ],
      "id": "013c4177-ab7b-4ae5-a5db-90ba050a074d",
      "name": "Download Image"
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://api.firecrawl.dev/v2/scrape",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendBody": true,
        "specifyBody": "json",
        "jsonBody": "={\n  \"url\": \"{{ $json.URL }}\",\n  \"onlyMainContent\": false,\n  \"parsers\": [\n    \"pdf\"\n  ],\n  \"formats\": [\n    \"markdown\",\n    {\n      \"type\": \"screenshot\",\n      \"fullPage\": true\n    }\n  ]\n} ",
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -80,
        -112
      ],
      "id": "3c0939d8-89a4-4598-a106-4a3322112260",
      "name": "Crawl Site",
      "credentials": {
        "httpHeaderAuth": {
          "id": "r3zPXXitwsV4wBHf",
          "name": "Firecrawl"
        }
      }
    },
    {
      "parameters": {
  ...

Output:
This workflow may experience timeout issues with long-running API requests.

**Symptoms**:
- Execution hangs indefinitely
- Connection timeout errors
- ETIMEDOUT or ESOCKETTIMEDOUT errors

**Root Cause**: No timeout configured for HTTP requests, or external services are slow.

**Solutions**:

1. **Set Appropriate Timeouts**:
```json
"options": {
  "timeout": 30000  // 30 seconds
}
```

2. **Add Error Handling**:
- Use Error Trigger node to catch timeout errors
- Implement fallback logic for failed requests

3. **Use Async Patterns**:
- For long operations, use webhook callbacks
- Implement polling patterns instead of waiting

4. **Configure Node Settings**:
```json
"retryOnFail": true,
"maxTries": 3,
"waitBetweenTries": 2000,
"continueOnFail": true
```

**Best Practice**: Set reasonable timeouts (10-30 seconds) and always have error handling for external API calls.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Timeout Configuration

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Mailing List Analysis",
  "nodes": [
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        -60,
        0
      ],
      "id": "37c270cd-3e5d-4ef6-8763-29d71cc8131c",
      "name": "When clicking \u2018Test workflow\u2019"
    },
    {
      "parameters": {
        "operation": "getAll",
        "returnAll": true,
        "filters": {}
      },
      "type": "n8n-nodes-base.mailerLite",
      "typeVersion": 2,
      "position": [
        160,
        0
      ],
      "id": "92f3c50f-1189-4d9f-a40b-09aed968c940",
      "name": "Get All Subscribers",
      "credentials": {
        "mailerLiteApi": {
          "id": "",
          "name": "MailerLite account"
        }
      }
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "bdcb77d5-0ca8-4fde-a9f2-c2ec41b7bf2a",
              "leftValue": "={{ $json.status }}",
              "rightValue": "active",
              "operator": {
                "type": "string",
                "operation": "equals"
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "type": "n8n-nodes-base.filter",
      "typeVersion": 2.2,
      "position": [
        380,
        0
      ],
      "id": "be6e055a-570e-4b45-b460-147a235f7f51",
      "name": "Filter Active Subscribers"
    },
    {
      "parameters": {
        "fieldsToAggregate": {
          "fieldToAggregate": [
            {
              "fieldToAggregate": "email"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.aggregate",
      "typeVersion": 1,
      "position": [
        600,
        0
      ],
      "id": "f7ff85f8-6a5d-4429-aeff-e13683783ae0",
 ...

Output:
This workflow may experience timeout issues with long-running API requests.

**Symptoms**:
- Execution hangs indefinitely
- Connection timeout errors
- ETIMEDOUT or ESOCKETTIMEDOUT errors

**Root Cause**: No timeout configured for HTTP requests, or external services are slow.

**Solutions**:

1. **Set Appropriate Timeouts**:
```json
"options": {
  "timeout": 30000  // 30 seconds
}
```

2. **Add Error Handling**:
- Use Error Trigger node to catch timeout errors
- Implement fallback logic for failed requests

3. **Use Async Patterns**:
- For long operations, use webhook callbacks
- Implement polling patterns instead of waiting

4. **Configure Node Settings**:
```json
"retryOnFail": true,
"maxTries": 3,
"waitBetweenTries": 2000,
"continueOnFail": true
```

**Best Practice**: Set reasonable timeouts (10-30 seconds) and always have error handling for external API calls.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Syntax Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Report Examples Demo"
  "nodes": [
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        -100,
        100
      ],
      "id": "0b4e2c14-3b21-4463-b1a8-44a8f6fd20ed",
      "name": "When clicking \u2018Execute workflow\u2019"
    },
    {
      "parameters": {
        "mode": "raw",
        "jsonOutput": "{\n  \"title\": \"SEO Report July\",\n  \"filename\": \"seo_report\",\n  \"content\": {\n    \"website\": \"example-store.com\",\n    \"analysis_date\": \"2025-07-31\",\n    \"overall_score\": 78,\n    \"critical_issues\": [\n      \"Missing meta descriptions on 15 pages\",\n      \"Slow page load times (average 4.2 seconds)\",\n      \"Broken internal links found\"\n    ],\n    \"technical_seo\": {\n      \"page_speed\": {\n        \"desktop_score\": 65,\n        \"mobile_score\": 42,\n        \"recommendations\": [\n          \"Optimize images (reduce file sizes by 60%)\",\n          \"Enable browser caching\",\n          \"Minify CSS and JavaScript files\"\n        ]\n      },\n      \"crawlability\": {\n        \"status\": \"Good\",\n        \"sitemap_url\": \"https://example-store.com/sitemap.xml\",\n        \"robots_txt\": \"Present and properly configured\",\n        \"issues\": []\n      }\n    },\n    \"content_analysis\": {\n      \"keyword_optimization\": {\n        \"primary_keywords\": [\"organic skincare\", \"natural beauty products\", \"eco-friendly cosmetics\"],\n        \"keyword_density\": \"2.3%\",\n        \"missing_keywords\": [\"sustainable beauty\", \"cruelty-free products\"]\n      },\n      \"content_quality\": {\n        \"readability_score\": 82,\n        \"average_word_count\": 450,\n        \"duplicate_content\": \"3 pages with similar content detected\"\n      }\n    },\n    \"recommendations\": {\n      \"high_priority\": [\n        \"Add meta descriptions to all product pages\",\n        \"Implement image compression to improve load times\",\n    ...

Output: The JSON is invalid because a comma is missing between properties. JSON requires commas to separate object properties and array elements.

Add the missing comma between object properties.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Disconnected Node

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Tools - Report Generator",
  "nodes": [
    {
      "parameters": {
        "operation": "toBinary",
        "sourceProperty": "base64",
        "options": {
          "fileName": "={{$('Start').item.json.filename + \".html\"}}",
          "mimeType": "={{ $json.mimetype }}"
        }
      },
      "type": "n8n-nodes-base.convertToFile",
      "typeVersion": 1.1,
      "position": [
        1000,
        -80
      ],
      "id": "6041b412-c030-4e83-86ab-3e8b68988398",
      "name": "convert_to_html_file"
    },
    {
      "parameters": {
        "jsCode": "return [\n  {\n    json: {\n      base64: Buffer.from($input.all()[0].json.html).toString('base64'),\n      mimetype: \"text/html\"\n    }\n  }\n];\n"
      },
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        780,
        -80
      ],
      "id": "04d67343-1344-48ca-a599-918e5b7688d9",
      "name": "convert_to_base64"
    },
    {
      "parameters": {
        "model": {
          "__rl": true,
          "mode": "list",
          "value": "gpt-4.1-mini"
        },
        "options": {
          "temperature": 0
        }
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "typeVersion": 1.2,
      "position": [
        -80,
        120
      ],
      "id": "fb451a32-3a49-4247-91f7-2f52db48d040",
      "name": "OpenAI Chat Model",
      "credentials": {
        "openAiApi": {
          "id": "RAj3VxCHt0rIwBTk",
          "name": "OpenAI"
        }
      }
    },
    {
      "parameters": {
        "promptType": "define",
        "text": "=Convert the following JSON data to HTML format:\n\n{{ JSON.stringify($json.content) }}\n# TRANSFORMATION REQUIREMENTS\n\n**Structure Conversion:**\n- Transform each JSON key into a semantic HTML section with appropriate heading level\n- Maintain logical hierarchy: top-level keys become h2, nested keys become h3, etc.\n- Preserve the original data organization and relationships\n\n**Content Formatting:**\n- T...

Output:
The workflow has a broken data flow. The node 'Start' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for 'Start'.

**Impact**: Data from 'Start' will not flow to any downstream nodes, effectively stopping the workflow at this point.

**Solution**:
1. Open the workflow in the n8n editor
2. Draw a connection from 'Start' to the next node in the flow
3. Verify the connection appears in the connections object

**Programmatic Fix**: Add the connection back to the workflow JSON:
```json
"connections": {
  "Start": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Expression Reference Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "SEO Data Analyst",
  "nodes": [
    {
      "parameters": {
        "options": {}
      },
      "type": "@n8n/n8n-nodes-langchain.chatTrigger",
      "typeVersion": 1.1,
      "position": [
        80,
        0
      ],
      "id": "e68f379c-160b-40e1-99ca-26eb326961a8",
      "name": "When chat message received",
      "webhookId": "78186b53-b072-4a0f-aaed-a585fe9e1b45"
    },
    {
      "parameters": {
        "contextWindowLength": 10
      },
      "type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
      "typeVersion": 1.3,
      "position": [
        480,
        220
      ],
      "id": "01365ff6-8b71-4e2b-8f41-1b4e11bdf3bc",
      "name": "Simple Memory"
    },
    {
      "parameters": {
        "model": {
          "__rl": true,
          "value": "gpt-4.1-mini",
          "mode": "list",
          "cachedResultName": "gpt-4.1-mini"
        },
        "options": {
          "temperature": 0
        }
      },
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "typeVersion": 1.2,
      "position": [
        320,
        220
      ],
      "id": "f117fbdb-6cc7-40e8-a9cb-a15815449599",
      "name": "OpenAI Chat Model",
      "credentials": {
        "openAiApi": {
          "id": "RAj3VxCHt0rIwBTk",
          "name": "OpenAI"
        }
      }
    },
    {
      "parameters": {
        "projectId": {
          "__rl": true,
          "value": "automations-451008",
          "mode": "list",
          "cachedResultName": "automations",
          "cachedResultUrl": ""
        },
        "sqlQuery": "{{ $fromAI('sql_statement') }}",
        "options": {
          "returnAsNumbers": true
        }
      },
      "type": "n8n-nodes-base.googleBigQueryTool",
      "typeVersion": 2.1,
      "position": [
        660,
        220
      ],
      "id": "6d8fb936-0f44-4896-a00d-6beb80007152",
      "name": "Execute BigQuery Statements",
      "credentials": {
        "googleBigQueryOAuth2Api": {
          "id": "9x33JaSI9N1JQ0NB",
          ...

Output:
In node 'SEO Data Analyst', the parameter 'text' contains an expression that references undefined data.

**Faulty Expression**: `={{ $items[999].json.value }}`
**Original Value**: `=Always execute the BigQuery SQL Query to get the correct data from the databases. Please anwswer then the following questions:
{{ $json.chatInput }}`

**Root Cause**: The expression references a field, node, or variable that doesn't exist in the data flow.

**Debugging Steps**:
1. Check the output of previous nodes to verify available fields
2. Use the Expression Editor to test expressions interactively
3. Add a Set node before this one to inspect available data
4. Use optional chaining for potentially undefined fields: `$json.field?.subfield`

**Best Practice**: Always validate data availability before using expressions.

Fix the expression in 'SEO Data Analyst' parameter 'text'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Data Type Mismatch

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Tool - Serper Crawl URL",
  "nodes": [
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "7320f474-4ba6-47b7-9ce7-82529cbb12ff",
              "name": "title",
              "value": "={{ $json.metadata.title }}",
              "type": "string"
            },
            {
              "id": "a047ca1d-04e0-493b-9d88-eddc4ec4478c",
              "name": "description",
              "value": "={{ $json.metadata.description }}",
              "type": "string"
            },
            {
              "id": "607f18e4-364c-4594-8821-3800b28d3c9b",
              "name": "markdown",
              "value": "={{ $json.markdown }}",
              "type": "string"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.set",
      "typeVersion": 3.4,
      "position": [
        280,
        0
      ],
      "id": "635191a6-85dc-439d-8616-ceabb5294a71",
      "name": "Get Metadata"
    },
    {
      "parameters": {
        "method": "POST",
        "url": "https://scrape.serper.dev",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "url",
              "value": "={{ $json.query }}"
            },
            {
              "name": "includeMarkdown",
              "value": "true"
            }
          ]
        },
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "options": {},
        "_injected_number_field": "not_a_number"
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        60,
        0
      ],
      "id": "b53e65c6-0b22-4b89-b718-32143058205e",
      "name": "Serp...

Output:
The node 'Serper' has a data type mismatch in its parameters.

**Issue**: A field expected a number but received a string value.

**Common Causes**:
1. Expression returns string instead of number
2. JSON parsing preserves string types for numeric values
3. Upstream node outputs different data types than expected

**Solutions**:

1. **Type Conversion in Expression**:
```javascript
// Convert string to number
{ parseInt($json.stringValue) }
{ parseFloat($json.decimalString) }
{ Number($json.value) }
```

2. **Use Code Node for Transformation**:
```javascript
return items.map(item => {
  item.json.numericField = Number(item.json.stringField);
  return item;
});
```

3. **Validate Data Types**:
- Use IF node to check types before processing
- Add error handling for invalid types

**Best Practice**: Always validate and transform data types explicitly when passing data between nodes.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Expression Reference Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Tool - Website Agent",
  "nodes": [
    {
      "parameters": {
        "promptType": "define",
        "text": "={{ $json.query }}",
        "options": {
          "systemMessage": "=### System Prompt for n8n AI Agent: Website Analyzer\n\nYou are an AI Agent designed to analyze web pages.  \nWhen the user says something similiar to, \"analyze the following page\" and provides a URL, follow these steps:\n\n1. **Scrape the web page at the provided URL using the available Tool.**\n2. **Extract and return the following information:**\n   - **Title:** The main title of the page.\n   - **Description:** The meta description or a brief summary if no meta description is available.\n   - **Summary:** A concise summary of the main content of the page.\n   - **N-gram Analysis:**  \n     - **Guidelines for N-gram Analysis:**\n       - Only analyze the main textual content of the page (ignore navigation, ads, and boilerplate).\n       - Remove all common stop words (such as \"the\", \"and\", \"is\", etc.) from the analysis.\n       - Normalize text by converting to lowercase and removing punctuation.\n       - For each n-gram type, list the top 10 most frequent items.\n       - Present results as lists, ordered by frequency (most frequent first).\n       - For bigrams and trigrams, do not include n-grams that contain only stop words.\n       - If the page has very little text, return as many n-grams as possible and note the limitation.\n\n     - **Unigram:** List of the most frequent single words (excluding stop words).\n     - **Bigram:** List of the most frequent two-word combinations (excluding those with only stop words).\n     - **Trigram:** List of the most frequent three-word combinations (excluding those with only stop words).\n\n**Output your results in a clear, structured format.**  \nIf any information is missing or cannot be found, state this explicitly.\n\n---\n\n#### Example Output\n\n**Title:** [Page Title]  \n**Description:** [Meta Description or bri...

Output:
In node 'Call Serper', the parameter 'description' contains an expression that references undefined data.

**Faulty Expression**: `={{ $json.deeply.nested.undefined.path }}`
**Original Value**: `Call this tool to scrape websites by providing a URL and return the prepared data.`

**Root Cause**: The expression references a field, node, or variable that doesn't exist in the data flow.

**Debugging Steps**:
1. Check the output of previous nodes to verify available fields
2. Use the Expression Editor to test expressions interactively
3. Add a Set node before this one to inspect available data
4. Use optional chaining for potentially undefined fields: `$json.field?.subfield`

**Best Practice**: Always validate data availability before using expressions.

Fix the expression in 'Call Serper' parameter 'description'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Rate Limiting Risk

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "SERP Analysis Template",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Keyword Research Form",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Focus Keyword",
              "requiredField": true
            },
            {
              "fieldLabel": "Country",
              "fieldType": "dropdown",
              "fieldOptions": {
                "values": [
                  {
                    "option": "de"
                  },
                  {
                    "option": "us"
                  },
                  {}
                ]
              }
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.2,
      "position": [
        -880,
        940
      ],
      "id": "b93168f8-109d-4014-9ec8-661086b9c4ad",
      "name": "On form submission",
      "webhookId": "92522c0f-d6a1-4d0d-aff7-eb5db34ee8e0"
    },
    {
      "parameters": {
        "url": "https://serpapi.com/search",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "serpApi",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "q",
              "value": "={{ $json['Focus Keyword'] }}"
            },
            {
              "name": "gl",
              "value": "={{ $json.Country }}"
            },
            {
              "name": "device",
              "value": "DESKTOP"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -660,
        1040
      ],
      "id": "67331a54-782c-4e11-a3c8-5441d65ded74",
      "name": "get_desktop_serp_results"
    },
    {
      "parameters": {
        "url": "https://serpapi.com/search",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "serpApi",
        "...

Output:
This workflow may encounter rate limiting issues when processing large batches of data.

**Common Rate Limit Errors**:
- HTTP 429 Too Many Requests
- HTTP 503 Service Unavailable
- API-specific rate limit messages

**Root Cause**: The workflow makes too many API requests in a short time period without delays.

**Solutions**:

1. **Add Wait Nodes**: Insert a Wait node between API calls
```json
{
  "parameters": {"amount": 1, "unit": "seconds"},
  "name": "Rate Limit Delay",
  "type": "n8n-nodes-base.wait"
}
```

2. **Enable Retry on Fail**:
```json
"retryOnFail": true,
"maxTries": 3,
"waitBetweenTries": 5000
```

3. **Use Batch Processing**: Split items into smaller batches with delays

4. **Implement Exponential Backoff**: Increase wait times with each retry

**Best Practice**: Always check API documentation for rate limits and implement appropriate throttling.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Rate Limiting Risk

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Product - SERP Analysis (SerpAPI + Crawl4AI)",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Keyword Research Form",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Focus Keyword",
              "requiredField": true
            },
            {
              "fieldLabel": "Country",
              "fieldType": "dropdown",
              "fieldOptions": {
                "values": [
                  {
                    "option": "de"
                  },
                  {
                    "option": "us"
                  },
                  {}
                ]
              }
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.2,
      "position": [
        -880,
        940
      ],
      "id": "ab9130ad-2ebe-457b-a442-277e406dfd0b",
      "name": "On form submission",
      "webhookId": "9180df6f-cf6d-4d11-941e-db5659923b24"
    },
    {
      "parameters": {
        "url": "https://serpapi.com/search",
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "serpApi",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "q",
              "value": "={{ $json['Focus Keyword'] }}"
            },
            {
              "name": "gl",
              "value": "={{ $json.Country }}"
            },
            {
              "name": "device",
              "value": "DESKTOP"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [
        -660,
        1040
      ],
      "id": "d14ba2d7-7120-4ad5-9f2a-0e6b1b5f5998",
      "name": "get_desktop_serp_results",
      "credentials": {
        "serpApi": {
          "id": "ip84lDL75JMRWLKs",
          "name": "SerpAPI Account"
        }
      }
    },
    {
      "paramet...

Output:
This workflow may encounter rate limiting issues when processing large batches of data.

**Common Rate Limit Errors**:
- HTTP 429 Too Many Requests
- HTTP 503 Service Unavailable
- API-specific rate limit messages

**Root Cause**: The workflow makes too many API requests in a short time period without delays.

**Solutions**:

1. **Add Wait Nodes**: Insert a Wait node between API calls
```json
{
  "parameters": {"amount": 1, "unit": "seconds"},
  "name": "Rate Limit Delay",
  "type": "n8n-nodes-base.wait"
}
```

2. **Enable Retry on Fail**:
```json
"retryOnFail": true,
"maxTries": 3,
"waitBetweenTries": 5000
```

3. **Use Batch Processing**: Split items into smaller batches with delays

4. **Implement Exponential Backoff**: Increase wait times with each retry

**Best Practice**: Always check API documentation for rate limits and implement appropriate throttling.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Data Type Mismatch

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Template - SERP Analysis (Serper)",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Keyword Research Form",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Focus Keyword",
              "requiredField": true
            },
            {
              "fieldLabel": "Country",
              "fieldType": "dropdown",
              "fieldOptions": {
                "values": [
                  {
                    "option": "de"
                  },
                  {
                    "option": "us"
                  }
                ]
              }
            },
            {
              "fieldLabel": "hl",
              "fieldType": "dropdown",
              "fieldOptions": {
                "values": [
                  {
                    "option": "de"
                  },
                  {
                    "option": "en"
                  }
                ]
              }
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.2,
      "position": [
        -1340,
        1080
      ],
      "id": "349ba094-8f87-4bcb-83f1-d286e7b96f76",
      "name": "On form submission",
      "webhookId": "688891c0-8e2b-49f6-beb1-ad881f0412cd"
    },
    {
      "parameters": {
        "url": "https://google.serper.dev/search",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "q",
              "value": "={{ $json['Focus Keyword']}}"
            },
            {
              "name": "gl",
              "value": "={{ $json.Country }}"
            },
            {
              "name": "device",
              "value": "mobile"
            },
            {
              "name": "exclude",
              "value": "[\"video\", \"image\", \"news\", \"places\...

Output:
The node 'get_queries' has a data type mismatch in its parameters.

**Issue**: A field expected a number but received a string value.

**Common Causes**:
1. Expression returns string instead of number
2. JSON parsing preserves string types for numeric values
3. Upstream node outputs different data types than expected

**Solutions**:

1. **Type Conversion in Expression**:
```javascript
// Convert string to number
{ parseInt($json.stringValue) }
{ parseFloat($json.decimalString) }
{ Number($json.value) }
```

2. **Use Code Node for Transformation**:
```javascript
return items.map(item => {
  item.json.numericField = Number(item.json.stringField);
  return item;
});
```

3. **Validate Data Types**:
- Use IF node to check types before processing
- Add error handling for invalid types

**Best Practice**: Always validate and transform data types explicitly when passing data between nodes.

Fix data type conversion in 'get_queries'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Disconnected Node

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Product - SERP Analysis (Serper & Crawl4AI)",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Keyword Research Form",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Focus Keyword",
              "requiredField": true
            },
            {
              "fieldLabel": "Country",
              "fieldType": "dropdown",
              "fieldOptions": {
                "values": [
                  {
                    "option": "de"
                  },
                  {
                    "option": "us"
                  },
                  {}
                ]
              }
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.2,
      "position": [
        -1340,
        1080
      ],
      "id": "d841d3e0-650d-49e7-abba-d5f4186d2312",
      "name": "On form submission",
      "webhookId": "d361eaea-6612-4e11-8f2b-45bdaf5326d6"
    },
    {
      "parameters": {
        "url": "https://google.serper.dev/search",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "q",
              "value": "={{ $json['Focus Keyword']}}"
            },
            {
              "name": "gl",
              "value": "={{ $json.Country }}"
            },
            {
              "name": "device",
              "value": "mobile"
            },
            {
              "name": "exclude",
              "value": "[\"video\", \"image\", \"news\", \"places\"]"
            }
          ]
        },
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-ba...

Output:
The workflow has a broken data flow. The node 'get_urls_to_crawl' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for 'get_urls_to_crawl'.

**Impact**: Data from 'get_urls_to_crawl' will not flow to any downstream nodes, effectively stopping the workflow at this point.

**Solution**:
1. Open the workflow in the n8n editor
2. Draw a connection from 'get_urls_to_crawl' to the next node in the flow
3. Verify the connection appears in the connections object

**Programmatic Fix**: Add the connection back to the workflow JSON:
```json
"connections": {
  "get_urls_to_crawl": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```

Reconnect 'get_urls_to_crawl' to the workflow.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Syntax Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Product - SERP Analysis (Serper + Firecrawl):
  "nodes": [
    {
      "parameters": {
        "formTitle": "Keyword Research Form",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Focus Keyword",
              "requiredField": true
            },
            {
              "fieldLabel": "Country",
              "fieldType": "dropdown",
              "fieldOptions": {
                "values": [
                  {
                    "option": "de"
                  },
                  {
                    "option": "us"
                  },
                  {}
                ]
              }
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.2,
      "position": [
        -1180,
        800
      ],
      "id": "5ecb2019-83f7-44bd-9db9-31e23d8d14a1",
      "name": "On form submission",
      "webhookId": "d361eaea-6612-4e11-8f2b-45bdaf5326d6"
    },
    {
      "parameters": {
        "url": "https://google.serper.dev/search",
        "authentication": "genericCredentialType",
        "genericAuthType": "httpHeaderAuth",
        "sendQuery": true,
        "queryParameters": {
          "parameters": [
            {
              "name": "q",
              "value": "={{ $json['Focus Keyword']}}"
            },
            {
              "name": "gl",
              "value": "={{ $json.Country }}"
            },
            {
              "name": "device",
              "value": "mobile"
            },
            {
              "name": "exclude",
              "value": "[\"video\", \"image\", \"news\", \"places\"]"
            }
          ]
        },
        "sendHeaders": true,
        "headerParameters": {
          "parameters": [
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-bas...

Output: The JSON contains an unclosed string. All string values must be enclosed in double quotes.

Add the missing closing quote to complete the string.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Expression Reference Error

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Commodity Price Tracker",
  "nodes": [
    {
      "parameters": {
        "content": "## Commodity Price Tracker",
        "height": 520,
        "width": 1100
      },
      "id": "240bb73f-5a0c-4672-a36d-98daf070734b",
      "name": "Sticky",
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        -500,
        -250
      ]
    },
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "commodity_price_tracker"
      },
      "id": "c23087f3-5dcd-45fe-a5f7-51cc99d3e7e1",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 1,
      "position": [
        -300,
        0
      ]
    },
    {
      "parameters": {
        "chunkSize": 400,
        "chunkOverlap": 40
      },
      "id": "013d0864-5f21-4cb8-8867-0c0e4445483a",
      "name": "Splitter",
      "type": "@n8n/n8n-nodes-langchain.textSplitterCharacterTextSplitter",
      "typeVersion": 1,
      "position": [
        -100,
        0
      ]
    },
    {
      "parameters": {
        "model": "default"
      },
      "id": "db0e2610-9e2f-4435-b166-81d3532dd10e",
      "name": "Embeddings",
      "type": "@n8n/n8n-nodes-langchain.embeddingsCohere",
      "typeVersion": 1,
      "position": [
        100,
        0
      ],
      "credentials": {
        "cohereApi": {
          "id": "COHERE_API",
          "name": "Cohere"
        }
      }
    },
    {
      "parameters": {
        "mode": "insert",
        "indexName": "commodity_price_tracker"
      },
      "id": "2b3496e2-4feb-4dbc-8a5f-b1ececb2f844",
      "name": "Insert",
      "type": "@n8n/n8n-nodes-langchain.vectorStoreRedis",
      "typeVersion": 1,
      "position": [
        300,
        0
      ],
      "credentials": {
        "redisApi": {
          "id": "REDIS_API",
          "name": "Redis account"
        }
      }
    },
    {
      "parameters": {
        "indexName": "commodity_price_tracker"
      },
      "id": "edbac296-9e6e-4152...

Output:
In node 'Agent', the parameter 'text' contains an expression that references undefined data.

**Faulty Expression**: `={{ $env.UNDEFINED_ENV_VAR }}`
**Original Value**: `={{ $json }}`

**Root Cause**: The expression references a field, node, or variable that doesn't exist in the data flow.

**Debugging Steps**:
1. Check the output of previous nodes to verify available fields
2. Use the Expression Editor to test expressions interactively
3. Add a Set node before this one to inspect available data
4. Use optional chaining for potentially undefined fields: `$json.field?.subfield`

**Best Practice**: Always validate data availability before using expressions.

Fix the expression in 'Agent' parameter 'text'.


Instruction:
Debug this n8n workflow. It has the following issue:
Error Type: Empty Input Handling

Please analyze the workflow JSON and explain:
1. What is wrong
2. Why it's causing problems
3. How to fix it

Workflow JSON:
{
  "name": "Crop Yield Predictor",
  "nodes": [
    {
      "parameters": {
        "content": "## Crop Yield Predictor",
        "height": 520,
        "width": 1100
      },
      "id": "f3362646-7c46-4e50-a664-66be86a30320",
      "name": "Sticky",
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        -500,
        -250
      ]
    },
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "crop_yield_predictor"
      },
      "id": "189bb6ad-a417-41f6-bf7a-0e3ddda212f0",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 1,
      "position": [
        -300,
        0
      ]
    },
    {
      "parameters": {
        "chunkSize": 400,
        "chunkOverlap": 40
      },
      "id": "30e55839-628c-4aa3-80d2-3c5a7ca26f46",
      "name": "Splitter",
      "type": "@n8n/n8n-nodes-langchain.textSplitterCharacterTextSplitter",
      "typeVersion": 1,
      "position": [
        -100,
        0
      ]
    },
    {
      "parameters": {
        "model": "default"
      },
      "id": "43e8ef2b-0af0-43f4-84f1-e72771c32adb",
      "name": "Embeddings",
      "type": "@n8n/n8n-nodes-langchain.embeddingsHuggingFace",
      "typeVersion": 1,
      "position": [
        100,
        0
      ],
      "credentials": {
        "huggingFaceApi": {
          "id": "HF_API",
          "name": "HuggingFace"
        }
      }
    },
    {
      "parameters": {
        "mode": "insert",
        "indexName": "crop_yield_predictor"
      },
      "id": "fa3aa105-97d5-48f0-9596-2c79447b9eea",
      "name": "Insert",
      "type": "@n8n/n8n-nodes-langchain.vectorStoreSupabase",
      "typeVersion": 1,
      "position": [
        300,
        0
      ],
      "credentials": {
        "supabaseApi": {
          "id": "SUPABASE_API",
          "name": "Supabase account"
        }
      }
    },
    {
      "parameters": {
        "indexName": "crop_yield_predictor"
      },
      "id": "aee3d47b-9...

Output:
This workflow may fail when receiving empty or null input data.

**Common Error Messages**:
- "Cannot read property 'x' of undefined"
- "No items to process"
- "Input data is empty"

**Root Cause**: The workflow doesn't handle cases where:
- Trigger receives no data
- Previous node returns empty array
- API returns null or empty response

**Solutions**:

1. **Add IF Node for Empty Check**:
```json
{
  "parameters": {
    "conditions": {
      "number": [{
        "value1": "={{ $json.length }}",
        "operation": "larger",
        "value2": 0
      }]
    }
  },
  "name": "Check Not Empty",
  "type": "n8n-nodes-base.if"
}
```

2. **Use Default Values**:
```javascript
{{ $json.field ?? "default_value" }}
{{ $json.items || [] }}
```

3. **Add Set Node with Defaults**:
- Create a Set node that provides default values
- Place it early in the workflow

4. **Implement No Match Output**:
- Many nodes have "No Match" outputs
- Use these to handle empty cases gracefully

**Best Practice**: Always validate input data and provide sensible defaults for optional fields.