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": "MMDt8lGtac2oU8nI",
  "meta": {
    "instanceId": "workflow-49a233cb",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.277283",
    "updatedAt": "2025-09-29T07:07:45.277294",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Build a Chatbot, Voice Agent and Phone Agent with Voiceflow, Google Calendar and RAG",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "20605948-5277-4fd7-9ba0-63f645bf2dcc",
      "name": "n8n_order",
      "type": "n8n-nodes-base.webhook",
      "position": [
        -340,
        -140
      ],
      "webhookId": "9ff7a394-5b4b-4790-a96b-c41c4ba27fa5",
      "parameters": {
        "path": "9ff7a394-5b4b-4790-a96b-c41c4ba27fa5",
        "options": {},
        "responseMode": "responseNode"
      },
      "typeVersion": 2,
      "notes": "This webhook node performs automated tasks as part of the workflow."
    },
    {
      "id": "9ef7971e-f679-4d5e-b347-3238d51a06d6",
      "name": "Google Calendar",
      "type": "n8n-nodes-base.googleCalendar",
      "position": [
        300,
        280
      ],
      "parameters": {
        "end": "={{ $json.output.end }}",
        "start": "={{ $json.output.start }}",
        "calendar": {
          "__rl": true,
          "mode": "list",
          "value": "info@n3w.it",
          "cachedResultName": "info@n3w.it"
        },
        "additionalFields": {
          "summary": "=Event title with {{ $('n8n_appointment').item.json.query.Email }}",
          "description": "Event description"
        }
      },
      "credentials": {
        "googleCalendarOAuth2Api": {
          "id": "8RFK3u13g2PJEGa9",
          "name": "Google Calendar account"
        }
      },
      "typeVersion": 1.3,
      "notes": "This googleCalendar node performs automated tasks as part of the work...

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": "O2R3U22TB968fWUo",
  "meta": {
    "instanceId": "workflow-9fe9bab7",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.280466",
    "updatedAt": "2025-09-29T07:07:45.280491",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Generate google meet links in slack",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "5577aaf6-f682-49c3-9d21-f819151f77c5",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        300,
        480
      ],
      "webhookId": "f442a7bb-451e-4371-8b7a-614caa0e04dd",
      "parameters": {
        "path": "slack-meet-trigger",
        "options": {},
        "httpMethod": "POST",
        "responseData": "noData",
        "responseMode": "lastNode"
      },
      "typeVersion": 1.1,
      "notes": "This webhook node performs automated tasks as part of the workflow."
    },
    {
      "id": "018c32c7-c3eb-4679-8064-ab92bb62cac5",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        140,
        142
      ],
      "parameters": {
        "color": 6,
        "width": 463.09809221779403,
        "height": 482.56534054190786,
        "content": "### 1. Setup: Add a Slack App\n**a.** Visit {{ $env.API_BASE_URL }} click on `New App` and choose a name and workspace.\n**b.** Click on `OAuth & Permissions` and scroll down to Scopes -> Bot token Scopes\n**c.** Add the `chat:write` scope & `chat:write.public`\n**d.** Navigate to `Slash Commands` and click `Create New Command`\n**e.** Use `/meet` as the command\n**f.** Copy the production URL from the **Webhook** node into `Request URL` within your slash command\n**g.** Add relevant description and usage hint\n**h.** Go to `Install app` and click install\n**i.** Don't worry about app distribution, ...

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: 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:
{
  "meta": {
    "instanceId": "workflow-4a4dbbee",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.295136",
    "updatedAt": "2025-09-29T07:07:45.295146",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "76589d1c-45f3-4a89-906f-8ef300d34964",
      "name": "n8n Form Trigger",
      "type": "n8n-nodes-base.formTrigger",
      "position": [
        -2520,
        -280
      ],
      "webhookId": "5e7637dd-d222-4786-8cdc-7b66cebc1481",
      "parameters": {
        "path": "schedule_appointment",
        "options": {
          "ignoreBots": true,
          "appendAttribution": true,
          "useWorkflowTimezone": true
        },
        "formTitle": "Schedule an Appointment",
        "formFields": {
          "values": [
            {
              "fieldLabel": "Your Name",
              "placeholder": "eg. Sam Smith",
              "requiredField": true
            },
            {
              "fieldType": "email",
              "fieldLabel": "Email",
              "placeholder": "eg. sam@example.com",
              "requiredField": true
            },
            {
              "fieldType": "textarea",
              "fieldLabel": "Enquiry",
              "placeholder": "eg. I'm looking for...",
              "requiredField": true
            }
          ]
        },
        "formDescription": "Welcome to Jim's Appointment Form.\nBefore we set a date, please tell me a little about yourself and how I can help."
      },
      "typeVersion": 2.1,
      "notes": "This formTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "194b7073-fa33-4e75-85ed-c02724c8075c",
      "name": "Form End",
      "type": "n8n-nodes-base.form",
      "position": [
        -420,
        -260
      ],
      "webhookId": "8fcc907b-bc2e-4fdf-a829-82c83e677724",
      "parameters": {
        "o...

Output: The JSON is invalid because it is missing a closing brace '}' at the end of the file. Add the missing '}' to close the workflow object.

Add a closing brace '}' at the end of the JSON.


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:
{
  "id": "5opbTWPZRN05bYdz",
  "meta": {
    "instanceId": "workflow-964bb3a5",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.299171",
    "updatedAt": "2025-09-29T07:07:45.299246",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Build an MCP Server with Google Calendar",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "trigger-7d0a8793",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        100,
        100
      ],
      "parameters": {}
    },
    {
      "id": "4be79e3f-3e83-4432-b23f-4e4e9cac171b",
      "name": "Sticky Note8",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -360,
        -800
      ],
      "parameters": {
        "color": 2,
        "width": 2720,
        "height": 140,
        "content": ""
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "439a0233-c8ec-4ea5-8630-0f6e62c76bef",
      "name": "Sticky Note9",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        520,
        -780
      ],
      "parameters": {
        "color": 2,
        "width": 960,
        "height": 80,
        "content": "# Learn How to Build a MCP Server with Google Calendar"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "08996f0a-4a2d-438f-a8d7-aca78968d33f",
      "name": "Sticky Note2",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -360,
        -600
      ],
      "parameters": {
        "color": 7,
        "width": 620,
        "height": 280,
        "content": "# Introduce\n\nThis tutorial focuses on guiding ...

Output:
The workflow has a broken data flow. The node '24ef1fd5-29dc-4208-a33b-5337307d01e0' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for '24ef1fd5-29dc-4208-a33b-5337307d01e0'.

**Impact**: Data from '24ef1fd5-29dc-4208-a33b-5337307d01e0' 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 '24ef1fd5-29dc-4208-a33b-5337307d01e0' 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": {
  "24ef1fd5-29dc-4208-a33b-5337307d01e0": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```

Reconnect '24ef1fd5-29dc-4208-a33b-5337307d01e0' to the workflow.


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": "\ud83e\udd16Calendar Agent",
  "nodes": [
    {
      "parameters": {
        "model": "gpt-4o",
        "options": {}
      },
      "id": "a34e2d84-ae30-4bfe-afa9-23dbd5dd3845",
      "name": "OpenAI Chat Model",
      "type": "n8n-nodes-base.noOp",
      "typeVersion": 1,
      "position": [
        740,
        540
      ],
      "credentials": {
        "openAiApi": {
          "id": "BP9v81AwJlpYGStD",
          "name": "OpenAi account"
        }
      },
      "notes": "This lmChatOpenAi node performs automated tasks as part of the workflow."
    },
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "7ab380a2-a8d3-421c-ab4e-748ea8fb7904",
              "name": "response",
              "value": "Unable to perform task. Please try again.",
              "type": "string"
            }
          ]
        },
        "options": {}
      },
      "id": "ec5518af-86f7-4f41-9682-ddddc621f356",
      "name": "Try Again",
      "type": "n8n-nodes-base.set",
      "typeVersion": 3.4,
      "position": [
        1660,
        380
      ],
      "notes": "This set node performs automated tasks as part of the workflow."
    },
    {
      "parameters": {
        "assignments": {
          "assignments": [
            {
              "id": "39c2f302-03be-4464-a17a-d7cc481d6d44",
              "name": "=response",
              "value": "={{$json.output}}",
              "type": "string"
            }
          ]
        },
        "options": {}
      },
      "id": "fc889778-08ca-431e-8109-7133110aa0db",
      "name": "Success",
      "type": "n8n-nodes-base.set",
      "typeVersion": 3.4,
      "position": [
        1660,
        180
      ],
      "notes": "This set node performs automated tasks as part of the workflow."
    },
    {
      "parameters": {
        "promptType": "define",
        "text": "={{ $json.query }}",
        "options": {
          "systemMessage": "=# Overview\nYou are a c...

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:
{
  "id": "grxwlyzZb3z4WLAa",
  "meta": {
    "instanceId": "workflow-0fde08d2",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.337034",
    "updatedAt": "2025-09-29T07:07:45.337049",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "MCP_CALENDAR",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "trigger-1e8a56a7",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        100,
        100
      ],
      "parameters": {}
    },
    {
      "id": "10e49f09-5ef8-4945-adcf-f8b99879a31c",
      "name": "MCP_CALENDAR",
      "type": "n8n-nodes-base.noOp",
      "position": [
        0,
        0
      ],
      "webhookId": "ceb17fa5-1937-405f-8000-ea3be7d2b032",
      "parameters": {
        "path": "/mcp/:tool/calendar"
      },
      "typeVersion": 1,
      "notes": "This mcpTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "54e84792-4f4a-4501-8aae-e40f06e958c1",
      "name": "GET_CALENDAR",
      "type": "n8n-nodes-base.googleCalendarTool",
      "position": [
        860,
        240
      ],
      "parameters": {
        "eventId": "={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('Event_ID', ``, 'string') }}",
        "options": {},
        "calendar": {
          "__rl": true,
          "mode": "list",
          "value": "a57a3781407f42b1ad7fe24ce76f558dc6c86fea5f349b7fd39747a2294c1654@group.calendar.google.com",
          "cachedResultName": "ODONTOLOGIA"
        },
        "operation": "get"
      },
      "credentials": {
        "googleCalendarOAuth2Api": {
          "id": "49eGhpwvfLcCZ0h3",
          "name": "Google Calendar account"
        }
      },
      "typeVersion": 1.3,
      "notes": "This googleCalendarTool node per...

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

**Faulty Expression**: `={{ $json["non_existent_field"] }}`
**Original Value**: `={{ /*n8n-auto-generated-fromAI-override*/ $fromAI('Event_ID', ``, 'string') }}`

**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 'DELETE_CALENDAR' parameter 'eventId'.


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:
{
  "id": "my335cY3wVwMqvqy",
  "meta": {
    "instanceId": "workflow-c828a542",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.330734",
    "updatedAt": "2025-09-29T07:07:45.330749",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Reservation Medcin",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "trigger-d7e25663",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        100,
        100
      ],
      "parameters": {}
    },
    {
      "id": "32fe7a8b-aa1a-4517-a167-41972f77d69b",
      "name": "When chat message received",
      "type": "n8n-nodes-base.noOp",
      "position": [
        -360,
        -40
      ],
      "webhookId": "8f427031-1110-4ea3-aef7-5d06ba7d5bce",
      "parameters": {
        "options": {}
      },
      "typeVersion": 1.1,
      "notes": "This chatTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "3510bb5a-3c8b-4978-a6c5-5c077be74f3f",
      "name": "AI Agent",
      "type": "n8n-nodes-base.noOp",
      "position": [
        -20,
        -60
      ],
      "parameters": {
        "options": {
          "systemMessage": "=\ud83c\udfaf Role of the Assistant\nYou are a virtual assistant specializing in appointment management for Dr. Hakim. Your goal is to schedule consultations accurately, ensuring real availability while providing a smooth experience for patients.\n\n\ud83d\udd52 Office Hours\nMonday - Friday: 9:00 AM - 8:00 PM\nSaturday: 9:00 AM - 1:00 PM\nSunday: \u274c Closed\nConsultation Duration: 1 hour\nBreak Between Patients: 15 minutes\n\n\ud83d\udcc5 Booking Process\n\n1\ufe0f\u20e3 Request Patient Information (Mandatory):\nFull Name\nPhone Number\nDesired Date and Time\n2\ufe0f\u20e3 Availab...

Output:
In node 'Sticky Note2', the parameter 'content' contains an expression that references undefined data.

**Faulty Expression**: `={{ $json["non_existent_field"] }}`
**Original Value**: `**AI Agent 👇**
The Prompt is already there, You just need to setup the prompt user message with your text message.`

**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 Note2' parameter 'content'.


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:
{
  "id": "9w5vu5VmXxpdBLWi:
  "meta": {
    "instanceId": "workflow-df71aefa",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.340736",
    "updatedAt": "2025-09-29T07:07:45.340754",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Send Daily Birthday Reminders from Google Contacts to Slack",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "e4de5385-6b00-4245-b06e-3003703a348a",
      "name": "Schedule Trigger",
      "type": "n8n-nodes-base.scheduleTrigger",
      "position": [
        80,
        140
      ],
      "parameters": {
        "rule": {
          "interval": [
            {
              "triggerAtHour": 8
            }
          ]
        }
      },
      "typeVersion": 1.2,
      "notes": "This scheduleTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "df65de90-d931-450e-bed1-bf8b4f79a090",
      "name": "Google Contacts",
      "type": "n8n-nodes-base.googleContacts",
      "notes": "Get the contact details\n",
      "position": [
        300,
        140
      ],
      "parameters": {
        "fields": [
          "emailAddresses",
          "birthdays",
          "names",
          "nicknames"
        ],
        "options": {},
        "operation": "getAll",
        "returnAll": true
      },
      "notesInFlow": true,
      "typeVersion": 1
    },
    {
      "id": "6e3dfeea-b22d-4156-a9a9-a8d5bb610848",
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "position": [
        800,
        180
      ],
      "parameters": {
        "options": {},
        "conditions": {
          "options": {
            "version": 2,
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
          },
          "combinator": "and",
          ...

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:
{
  "meta": {
    "instanceId": "workflow-be0b26f5",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.336028",
    "updatedAt": "2025-09-29T07:07:45.336042",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "51dbe3b4-42f6-43c9-85dc-42ae49be6ba9",
      "name": "Get RFP Data",
      "type": "n8n-nodes-base.extractFromFile",
      "position": [
        1003,
        278
      ],
      "parameters": {
        "options": {},
        "operation": "pdf"
      },
      "typeVersion": 1,
      "notes": "This extractFromFile node performs automated tasks as part of the workflow."
    },
    {
      "id": "c42e6bfc-a426-4d12-bf95-f3fe6e944631",
      "name": "Item List Output Parser",
      "type": "n8n-nodes-base.noOp",
      "position": [
        2140,
        540
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 1,
      "notes": "This outputParserItemList node performs automated tasks as part of the workflow."
    },
    {
      "id": "1703e9c3-f49e-4272-ad11-0b9d4e9a76c6",
      "name": "For Each Question...",
      "type": "n8n-nodes-base.splitInBatches",
      "position": [
        2460,
        340
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 3,
      "notes": "This splitInBatches node performs automated tasks as part of the workflow."
    },
    {
      "id": "a54fa4ee-6f67-41a9-89fe-fd9f2bf094de",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        760,
        60
      ],
      "parameters": {
        "color": 7,
        "width": 532.597092515486,
        "height": 508.1316876142587,
        "content": "## 1. API to Trigger Workflow\n[Read more about using Webhooks]({{ $env.WEBHOOK_URL }}\n\nThis workflow requires the user to submit the RFP document via an API request. It's a common pattern t...

Output:
In node 'Sticky Note6', the parameter 'content' contains an expression that references undefined data.

**Faulty Expression**: `={{ $items[999].json.value }}`
**Original Value**: `

🚨**Required**
* Use a tool such as Postman to send data to the webhook.`

**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 Note6' parameter 'content'.


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:
{
  "id": "7Qa2mH7PnDxy7Qat",
  "meta": {
    "instanceId": "workflow-538bbb6f",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.361940",
    "updatedAt": "2025-09-29T07:07:45.361983",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Generate Exam Questions",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "4e037d6e-93a9-4c1b-b84a-dbbcf77beaf5",
      "name": "When clicking \u2018Test workflow\u2019",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        -740,
        120
      ],
      "parameters": {},
      "typeVersion": 1,
      "notes": "This manualTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "febc8bb7-5de7-46d6-bc23-54673089cd3d",
      "name": "Qdrant Vector Store",
      "type": "n8n-nodes-base.noOp",
      "position": [
        900,
        240
      ],
      "parameters": {
        "mode": "insert",
        "options": {},
        "qdrantCollection": {
          "__rl": true,
          "mode": "list",
          "value": "ai_article_test",
          "cachedResultName": "ai_article_test"
        }
      },
      "credentials": {
        "qdrantApi": {
          "id": "iyQ6MQiVaF3VMBmt",
          "name": "QdrantApi account (Hetzner)"
        }
      },
      "typeVersion": 1,
      "notes": "This vectorStoreQdrant node performs automated tasks as part of the workflow."
    },
    {
      "id": "2d7e2673-6559-49b3-9ed0-29ca2c376f00",
      "name": "Create collection",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
        -440,
        -20
      ],
      "parameters": {
        "url": "{{ $env.WEBHOOK_URL }}",
        "method": "PUT",
        "options": {},
        "jsonBody": "{\n  \"vectors\": {\n    \"size\": 1536,\n    \"distance\": \"Cosine\"  \n  },\n ...

Output:
The workflow has a broken data flow. The node '9d7561f0-5b01-4327-ab62-68a105364155' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for '9d7561f0-5b01-4327-ab62-68a105364155'.

**Impact**: Data from '9d7561f0-5b01-4327-ab62-68a105364155' 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 '9d7561f0-5b01-4327-ab62-68a105364155' 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": {
  "9d7561f0-5b01-4327-ab62-68a105364155": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```


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:
{
  "id" "2ddwHvuidKc6lZia",
  "meta": {
    "instanceId": "workflow-4a0ccb43",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.361424",
    "updatedAt": "2025-09-29T07:07:45.361439",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "AI Agent - Cv Resume - Automated Screening , Sorting , Rating and Tracker System",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "92b75a8f-da03-4545-91ef-da29b88f1cef",
      "name": "GDocs - Get Job Desc",
      "type": "n8n-nodes-base.googleDocs",
      "position": [
        220,
        120
      ],
      "parameters": {
        "operation": "get",
        "documentURL": "{{ $env.WEBHOOK_URL }}"
      },
      "credentials": {
        "googleDocsOAuth2Api": {
          "id": "k7j5KUAvAzARmxTu",
          "name": "Google Docs account"
        }
      },
      "typeVersion": 2,
      "notes": "This googleDocs node performs automated tasks as part of the workflow."
    },
    {
      "id": "213712d5-f7ef-4c49-bfa6-da02be76a213",
      "name": "Google Drive - Resume CV File Created",
      "type": "n8n-nodes-base.googleDriveTrigger",
      "position": [
        -540,
        120
      ],
      "parameters": {
        "event": "fileCreated",
        "options": {},
        "pollTimes": {
          "item": [
            {
              "mode": "everyHour"
            }
          ]
        },
        "triggerOn": "specificFolder",
        "folderToWatch": {
          "__rl": true,
          "mode": "list",
          "value": "17g2HGxLieONy6EWfsPADvA9IXDp5nJ8p",
          "cachedResultUrl": "{{ $env.WEBHOOK_URL }}",
          "cachedResultName": "Unfiltered"
        }
      },
      "credentials": {
        "googleDriveOAuth2Api": {
          "id": "i0k4QgJ8YgVPNgF7",
          "name": "Google Drive account"
        }
 ...

Output: The JSON is missing a colon between a key and its value. JSON requires colons to separate keys from values.

Add the missing colon after the property name.


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": "workflow-d608ce94",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.350662",
    "updatedAt": "2025-09-29T07:07:45.350690",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "51dbe3b4-42f6-43c9-85dc-42ae49be6ba9",
      "name": "Get RFP Data",
      "type": "n8n-nodes-base.extractFromFile",
      "position": [
        1003,
        278
      ],
      "parameters": {
        "options": {},
        "operation": "pdf"
      },
      "typeVersion": 1,
      "notes": "This extractFromFile node performs automated tasks as part of the workflow."
    },
    {
      "id": "c42e6bfc-a426-4d12-bf95-f3fe6e944631",
      "name": "Item List Output Parser",
      "type": "n8n-nodes-base.noOp",
      "position": [
        2140,
        540
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 1,
      "notes": "This outputParserItemList node performs automated tasks as part of the workflow."
    },
    {
      "id": "1703e9c3-f49e-4272-ad11-0b9d4e9a76c6",
      "name": "For Each Question...",
      "type": "n8n-nodes-base.splitInBatches",
      "position": [
        2460,
        340
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 3,
      "notes": "This splitInBatches node performs automated tasks as part of the workflow."
    },
    {
      "id": "a54fa4ee-6f67-41a9-89fe-fd9f2bf094de",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        760,
        60
      ],
      "parameters": {
        "color": 7,
        "width": 532.597092515486,
        "height": 508.1316876142587,
        "content": "## 1. API to Trigger Workflow\n[Read more about using Webhooks]({{ $env.WEBHOOK_URL }}\n\nThis workflow requires the user to submit the RFP document via an API request. It's a common pattern t...

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:
{
  "meta": {
    "instanceId": "workflow-3c85b426",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.377662",
    "updatedAt": "2025-09-29T07:07:45.377680",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "0c46db99-4216-4132-a705-62560e8ebff0",
      "name": "Sticky Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        200,
        -100
      ],
      "parameters": {
        "color": 4,
        "width": 275,
        "height": 239,
        "content": "\ud83d\udc48\nSet up Google Drive credentials.\n\nWhen a new photo/video or carousel is uploaded to the selected folder in Google Drive for posting on Instagram, this trigger will be activated.\n\nFollow the steps (YouTube video):\n{{ $env.WEBHOOK_URL }}"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "bea7e9cb-c125-4469-a902-71f949d82858",
      "name": "Sticky Note3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        180,
        -480
      ],
      "parameters": {
        "color": 4,
        "width": 492,
        "height": 100,
        "content": "### Automate instagram posts with Google Drive, AI Captions & Facebook Graph API Agent (Easy to Set-Up)\n(Easy to set-up)"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "b56d4729-cc93-41d9-be09-27547d0d8204",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        480,
        -100
      ],
      "parameters": {
        "color": 3,
        "width": 275,
        "height": 239,
        "content": "\ud83d\udc48\nSet up Google Drive credentials.\n\nThis node will download the posting file in the n8n workflow.\n\nFollow the steps (YouTub...

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:
{
  "id": "aswQJmksAOmHmn8c",
  "meta": {
    "instanceId": "workflow-681f0c24",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.412621",
    "updatedAt": "2025-09-29T07:07:45.412628",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Fetch the Most Recent Document from Google Drive",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "d9df98fe-bf03-45bd-9cb9-ed32371b7970",
      "name": "Google Docs",
      "type": "n8n-nodes-base.googleDocs",
      "position": [
        100,
        500
      ],
      "parameters": {
        "operation": "get",
        "documentURL": "{{ $env.BASE_URL }}"
      },
      "credentials": {
        "googleDocsOAuth2Api": {
          "id": "",
          "name": ""
        }
      },
      "typeVersion": 2,
      "notes": "This googleDocs node performs automated tasks as part of the workflow."
    },
    {
      "id": "46daf9a2-0d13-49c3-8272-e366888e1960",
      "name": "Wikipedia",
      "type": "n8n-nodes-base.noOp",
      "position": [
        440,
        440
      ],
      "parameters": {},
      "typeVersion": 1,
      "notes": "This toolWikipedia node performs automated tasks as part of the workflow."
    },
    {
      "id": "9dafd444-257c-4f44-9550-1dbd19dc44d4",
      "name": "Calculator",
      "type": "n8n-nodes-base.noOp",
      "position": [
        700,
        440
      ],
      "parameters": {},
      "typeVersion": 1,
      "notes": "This toolCalculator node performs automated tasks as part of the workflow."
    },
    {
      "id": "259a7fa0-4b37-453e-a730-fb2fc7bc3eb0",
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        1040,
        540
      ],
      "parameters": {
        "columns": {
          "value": {
            "Name": "={{ $('Google Dr...

Output:
The node 'Sticky Note' 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 Note'.


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:
{
  "meta": {
    "instanceId": "workflow-62614104",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.411379",
    "updatedAt": "2025-09-29T07:07:45.411386",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "fb5b682b-5e30-497e-b465-c3369bb3c2e3",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -32,
        -20
      ],
      "parameters": {
        "color": 7,
        "width": 680,
        "height": 660,
        "content": "## 1. Set up an MCP Server Trigger\n[Read more about the MCP Server Trigger]({{ $env.WEBHOOK_URL }}"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "cfc2c7f1-a6ee-42a9-b955-e5bce012b6e1",
      "name": "Sticky Note3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -40,
        -160
      ],
      "parameters": {
        "color": 5,
        "width": 380,
        "height": 100,
        "content": "### Always Authenticate Your Server!\nBefore going to production, it's always advised to enable authentication on your MCP server trigger."
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "79586d35-0582-4da8-91da-5bc8451c2089",
      "name": "When Executed by Another Workflow",
      "type": "n8n-nodes-base.executeWorkflowTrigger",
      "position": [
        800,
        360
      ],
      "parameters": {
        "workflowInputs": {
          "values": [
            {
              "name": "operation"
            },
            {
              "name": "folderId"
            },
            {
              "name": "fileId"
            }
          ]
        }
      },
      "typeVersion": 1.1,
      "notes": "This executeWorkflowTrig...

Output:
The workflow has a broken data flow. The node '6be1ff49-5edc-42d2-87de-09d207ee7733' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for '6be1ff49-5edc-42d2-87de-09d207ee7733'.

**Impact**: Data from '6be1ff49-5edc-42d2-87de-09d207ee7733' 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 '6be1ff49-5edc-42d2-87de-09d207ee7733' 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": {
  "6be1ff49-5edc-42d2-87de-09d207ee7733": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```

Reconnect '6be1ff49-5edc-42d2-87de-09d207ee7733' to the workflow.


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:
{
  "id": "1001",
  "name": "typeform feedback workflow",
  "nodes": [
    {
      "name": "Typeform Trigger",
      "type": "n8n-nodes-base.typeformTrigger",
      "notes": "course feedback",
      "position": [
        450,
        300
      ],
      "webhookId": "1234567890",
      "parameters": {
        "formId": "yxcvbnm"
      },
      "credentials": {
        "typeformApi": "typeform"
      },
      "notesInFlow": true,
      "typeVersion": 1,
      "id": "7d324a8c-beed-4fdc-8bf6-aa61a62adc02"
    },
    {
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "notes": "filter feedback",
      "position": [
        850,
        300
      ],
      "parameters": {
        "conditions": {
          "number": [
            {
              "value1": "={{$json[\"usefulness\"]}}",
              "value2": 3,
              "operation": "largerEqual"
            }
          ],
          "string": [],
          "boolean": []
        }
      },
      "notesInFlow": true,
      "typeVersion": 1,
      "id": "217e2a5c-4110-4bc7-a6da-38fe36b3ec21"
    },
    {
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "notes": "positive feedback",
      "position": [
        1050,
        200
      ],
      "parameters": {
        "range": "positive_feedback!A:C",
        "options": {},
        "sheetId": "asdfghjkl\u00f6\u00e4",
        "operation": "append",
        "authentication": "{{ $credentials.oAuth2 }}"
      },
      "credentials": {
        "googleSheetsOAuth2Api": "google_sheets_oauth"
      },
      "notesInFlow": true,
      "typeVersion": 1,
      "id": "3ce380e1-d8eb-49e0-a651-e0ff50ab7f38"
    },
    {
      "name": "Set",
      "type": "n8n-nodes-base.set",
      "notes": "capture typeform data",
      "position": [
        650,
        300
      ],
      "parameters": {
        "values": {
          "number": [
            {
              "name": "usefulness",
              "value": "={{$json[\"How useful was the course...

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: 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:
{
  "nodes": [
    {
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        700,
        300
      ],
      "parameters": {
        "range": "Problems!A:D",
        "options": {},
        "sheetId": "17fzSFl1BZ1njldTfp5lvh8HtS0-pNXH66b7qGZIiGRU"
      },
      "credentials": {
        "googleApi": ""
      },
      "typeVersion": 1,
      "id": "node-5db84cf9"
    },
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        500,
        300
      ],
      "parameters": {
        "path": "webhook",
        "options": {},
        "responseData": "allEntries",
        "responseMode": "lastNode",
        "_injected_number_field": "not_a_number"
      },
      "typeVersion": 1,
      "id": "node-09f203a3"
    },
    {
      "id": "error-1c20f607",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "connections": {},
  "name": "Production Workflow",
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "retryCount": 3
  },
  "meta": {
    "instanceId": "workflow-48843232",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.433824",
    "updatedAt": "2025-09-29T07:07:45.433843",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "description": "Production-ready workflow: Production Workflow. This workflow has been optimized for production use wit...

Output:
The node 'Webhook' 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: 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:
{
  "nodes": [
    {
      "id": "trigger-3862a4ef",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        100,
        100
      ],
      "parameters": {}
    },
    {
      "name": "Read Sheet",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        450,
        300
      ],
      "parameters": {
        "sheetId": "1GT2dc0dOkAC1apY0UlTKY9vitBl8PtKrILvFiAy5VBs"
      },
      "credentials": {
        "googleApi": ""
      },
      "typeVersion": 1,
      "id": "3e3f25eb-64b7-4b36-97fa-1949cd4f3853",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "name": "Convert to XLS",
      "type": "n8n-nodes-base.spreadsheetFile",
      "position": [
        650,
        300
      ],
      "parameters": {
        "operation": "toFile"
      },
      "typeVersion": 1,
      "id": "ba55f631-33c9-486c-adcd-ea34a4d4b667",
      "notes": "This spreadsheetFile node performs automated tasks as part of the workflow."
    },
    {
      "name": "Upload Dropbox",
      "type": "n8n-nodes-base.dropbox",
      "position": [
        850,
        300
      ],
      "parameters": {
        "path": "/my-sheets/prices.xls",
        "binaryData": true
      },
      "credentials": {
        "dropboxApi": ""
      },
      "typeVersion": 1,
      "id": "2579c489-dc33-41c4-b5c9-c83d4b691ae9",
      "notes": "This dropbox node performs automated tasks as part of the workflow."
    },
    {
      "name": "Trigger all 15 min",
      "type": "n8n-nodes-base.interval",
      "position": [
        250,
        300
      ],
      "parameters": {
        "unit": "minutes",
        "interval": 15
      },
      "typeVersion": 1,
      "id": "28c36a09-d333-44dc-998a-2f4caba579d5",
      "notes": "This interval node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-39a7375c",
      "name": "Error Handler",
      "type": "...

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: 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": "trigger-eea359a6",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        100,
        100
      ],
      "parameters": {}
    },
    {
      "name": "Google Sheets1",
      "type": "n8n-nodes-base.googleSheets",
      "notes": "Append data to sheet",
      "position": [
        980,
        -120
      ],
      "parameters": {
        "range": "A:C",
        "options": {
          "usePathForKeyRow": true
        },
        "sheetId": "qwertz",
        "operation": "append",
        "authentication": "{{ $credentials.oAuth2 }}"
      },
      "credentials": {
        "googleSheetsOAuth2Api": {
          "id": "{{ $credentials.googleSheetsOAuth2Api.id }}",
          "name": "google_sheets_oauth"
        }
      },
      "notesInFlow": true,
      "typeVersion": 1,
      "id": "36d62e7a-b50f-4123-8856-b839850e5218"
    },
    {
      "name": "read json file",
      "type": "n8n-nodes-base.readBinaryFile",
      "position": [
        620,
        -120
      ],
      "parameters": {
        "filePath": "/username/users_spreadsheet.json"
      },
      "typeVersion": 1,
      "id": "0220d7cc-3ff2-4465-b8fc-b2f666184a55",
      "notes": "This readBinaryFile node performs automated tasks as part of the workflow."
    },
    {
      "name": "move binary data 2",
      "type": "n8n-nodes-base.moveBinaryData",
      "position": [
        800,
        -120
      ],
      "parameters": {
        "options": {}
      },
      "typeVersion": 1,
      "id": "000b8393-3907-40b7-8996-9cf8f1c4c8df",
      "notes": "This moveBinaryData node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-c67928ac",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
    ...

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: 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:
{
  "nodes" [
    {
      "name": "Cron",
      "type": "n8n-nodes-base.cron",
      "position": [
        100,
        160
      ],
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "hour": 5,
              "mode": "everyWeek"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "dbfc88c9-36e2-4cce-b661-e6767fcae129",
      "notes": "This cron node performs automated tasks as part of the workflow."
    },
    {
      "name": "MySQL - insert",
      "type": "n8n-nodes-base.mySql",
      "position": [
        500,
        160
      ],
      "parameters": {
        "table": "books",
        "columns": "title, price",
        "options": {
          "ignore": true,
          "priority": "LOW_PRIORITY"
        }
      },
      "credentials": {
        "mySql": {
          "id": "{{ $credentials.mySql.id }}",
          "name": "MySQL account"
        }
      },
      "typeVersion": 1,
      "id": "87bb83bd-c47f-4d2b-a0df-095c63bbf30e",
      "notes": "This mySql node performs automated tasks as part of the workflow."
    },
    {
      "name": "Google Sheets - read",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        300,
        160
      ],
      "parameters": {
        "options": {},
        "sheetId": "qwertz",
        "authentication": "{{ $credentials.oAuth2 }}"
      },
      "credentials": {
        "googleSheetsOAuth2Api": {
          "id": "{{ $credentials.googleSheetsOAuth2Api.id }}",
          "name": "google_sheets_oauth"
        }
      },
      "typeVersion": 1,
      "id": "98e3c71d-cecd-4176-a968-28c1fa8176aa",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-11461790",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",...

Output: The JSON is missing a colon between a key and its value. JSON requires colons to separate keys from values.


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:
{
  "nodes": [
    {
      "name": "Cron",
      "type": "n8n-nodes-base.cron",
      "position": [
        100,
        420
      ],
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "hour": 5,
              "mode": "everyWeek"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "22263ea2-4c8d-44eb-8207-88951c2994ea",
      "notes": "This cron node performs automated tasks as part of the workflow."
    },
    {
      "name": "MySQL - select",
      "type": "n8n-nodes-base.mySql",
      "position": [
        300,
        420
      ],
      "parameters": {
        "query": "SELECT * FROM books;",
        "operation": "executeQuery"
      },
      "credentials": {
        "mySql": {
          "id": "{{ $credentials.mySql.id }}",
          "name": "MySQL account"
        }
      },
      "typeVersion": 1,
      "id": "2e4a2b52-6ac7-4531-9d10-76835edbe4bd",
      "notes": "This mySql node performs automated tasks as part of the workflow."
    },
    {
      "name": "Google Sheets - write",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        500,
        420
      ],
      "parameters": {
        "options": {},
        "sheetId": "qwertz",
        "operation": "append",
        "authentication": "={{ $json[\"non_existent_field\"] }}"
      },
      "credentials": {
        "googleSheetsOAuth2Api": {
          "id": "{{ $credentials.googleSheetsOAuth2Api.id }}",
          "name": "google_sheets_oauth"
        }
      },
      "typeVersion": 1,
      "id": "60cdd661-0749-46a4-86a2-47a1253babda",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-42679379",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
   ...

Output:
In node 'Google Sheets - write', the parameter 'authentication' contains an expression that references undefined data.

**Faulty Expression**: `={{ $json["non_existent_field"] }}`
**Original Value**: `{{ $credentials.oAuth2 }}`

**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 'Google Sheets - write' parameter 'authentication'.


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:
{
  "nodes": [
    {
      "name": "Read from Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        460,
        300
      ],
      "parameters": {
        "options": {},
        "sheetId": "1uFISwZJ1rzkOnOSNocX-_n-ASSAznWGdpcPK3_KCvVo"
      },
      "credentials": {
        "googleSheetsOAuth2Api": {
          "id": "{{ $credentials.googleSheetsOAuth2Api.id }}",
          "name": "Tom's Google Sheets account"
        }
      },
      "typeVersion": 2,
      "id": "node-dd21e8d5"
    },
    {
      "name": "Create HTML file",
      "type": "n8n-nodes-base.spreadsheetFile",
      "position": [
        680,
        300
      ],
      "parameters": {
        "options": {},
        "operation": "toFile",
        "fileFormat": "html"
      },
      "typeVersion": 1,
      "id": "node-fdbdb843"
    },
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        240,
        300
      ],
      "webhookId": "08569699-fea2-4856-80aa-fe878ab9dd4f",
      "parameters": {
        "path": "08569699-fea2-4856-80aa-fe878ab9dd4f",
        "options": {},
        "responseData": "firstEntryBinary",
        "responseMode": "lastNode"
      },
      "typeVersion": 1,
      "id": "node-7b1a86e3"
    },
    {
      "id": "error-f1080724",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {},
        "_injected_number_field": "not_a_number"
      }
    }
  ],
  "connections": {},
  "name": "Production Workflow",
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "retryCount": 3
  },
  "meta": {
    "instanceId": "workflow...

Output:
The node 'Error Handler' 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 'Error Handler'.


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:
{
  "nodes": [
    {
      "name": "Read from Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        460,
        300
      ],
      "parameters": {
        "options": {},
        "sheetId": "1uFISwZJ1rzkOnOSNocX-_n-ASSAznWGdpcPK3_KCvVo",
        "_injected_number_field": "not_a_number"
      },
      "credentials": {
        "googleSheetsOAuth2Api": {
          "id": "{{ $credentials.googleSheetsOAuth2Api.id }}",
          "name": "Tom's Google Sheets account"
        }
      },
      "typeVersion": 2,
      "id": "node-fe1598e2"
    },
    {
      "name": "Respond to Webhook",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
        900,
        300
      ],
      "parameters": {
        "options": {
          "responseHeaders": {
            "entries": [
              {
                "name": "Content-Type",
                "value": "text/html; charset=UTF-8"
              }
            ]
          }
        },
        "respondWith": "text",
        "responseBody": "={{$json[\"html\"]}}"
      },
      "typeVersion": 1,
      "id": "node-4a7f1139"
    },
    {
      "name": "Build HTML",
      "type": "n8n-nodes-base.function",
      "position": [
        680,
        300
      ],
      "parameters": {
        "functionCode": "const columns = Object.keys(items[0].json);\n\nconst html = `\n<!doctype html>\n\n  \n    <meta charset=\"utf-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n    <title>HTML Table Example</title>\n    <link href=\"https://cdn.jsdelivr.net/npm/bootstrap@5.2.0/dist/css/bootstrap.min.css\" rel=\"stylesheet\" integrity=\"sha384-gH2yIJqKdNHPEq0n4Mqa/HGKIhSkIHeL5AyhkYV8i59U5AR6csBvApHHNl/vI1Bx\" crossorigin=\"anonymous\">\n  \n  \n
\n
\n
\n
HTML Table Example
\n
\n
\n           ...

Output:
The node 'Read from Google Sheets' 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 'Read from Google Sheets'.


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:
{
  "meta": {
    "instanceId": "workflow-f0ab789b",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.510495",
    "updatedAt": "2025-09-29T07:07:45.510503",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "b3a0fa7c-eb47-4f51-98d7-ac1a8de7b05d",
      "name": "On new or updated row",
      "type": "n8n-nodes-base.googleSheetsTrigger",
      "position": [
        800,
        380
      ],
      "parameters": {
        "options": {
          "columnsToWatch": [
            "Security Code"
          ]
        },
        "pollTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        },
        "sheetName": {
          "__rl": true,
          "mode": "list",
          "value": "gid=0",
          "cachedResultUrl": "{{ $env.WEBHOOK_URL }}",
          "cachedResultName": "Investments"
        },
        "documentId": {
          "__rl": true,
          "mode": "list",
          "value": "1Np8TQv7kWwwrGiPkWWsmr4WYWAosv1BMBwwCd0f-dis",
          "cachedResultUrl": "{{ $env.WEBHOOK_URL }}",
          "cachedResultName": "Investments"
        }
      },
      "credentials": {
        "googleSheetsTriggerOAuth2Api": {
          "id": "{{ $credentials.googleSheetsTriggerOAuth2Api.id }}",
          "name": "TEST USER"
        }
      },
      "typeVersion": 1,
      "notes": "This googleSheetsTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "61b96d9b-801c-43e6-b89a-a55245386e4f",
      "name": "Send message",
      "type": "n8n-nodes-base.discord",
      "position": [
        1200,
        380
      ],
      "parameters": {
        "text": "=```\n{{ $json.ascii_table }}\n```",
        "options": {},
        "webhookUri": "{{ $env.API_BASE_URL }}",
        "_injected_number_field": "not_a_number"
      },
      "typeVersion": 1,
...

Output:
The node 'Send message' 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 'Send message'.


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:
{
  "nodes": [
    {
      "name": "Google Sheets:
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        700,
        300
      ],
      "parameters": {
        "range": "Problems!A:D",
        "options": {},
        "sheetId": "17fzSFl1BZ1njldTfp5lvh8HtS0-pNXH66b7qGZIiGRU"
      },
      "credentials": {
        "googleApi": ""
      },
      "typeVersion": 1,
      "id": "node-b0803f61"
    },
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        500,
        300
      ],
      "parameters": {
        "path": "webhook",
        "options": {},
        "responseData": "allEntries",
        "responseMode": "lastNode"
      },
      "typeVersion": 1,
      "id": "node-e927e48e"
    },
    {
      "id": "error-47a7726c",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "connections": {},
  "name": "Production Workflow",
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "retryCount": 3
  },
  "meta": {
    "instanceId": "workflow-7d56ef35",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.453353",
    "updatedAt": "2025-09-29T07:07:45.453438",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "description": "Production-ready workflow: Production Workflow. This workflow has been optimized for production use with comprehensive error handling, security, and docum...

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


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:
{
  "nodes": [
    {
      "id": "096a8e0c-8f72-40fb-aa1e-118fb33a3916",
      "name": "Prepare Fields",
      "type": "n8n-nodes-base.code",
      "position": [
        1740,
        860
      ],
      "parameters": {
        "jsCode": "const formData = $input.all()[0].json.payload.data\nconst Date = $input.all()[0].json.payload.submittedAt || new Date()\n\nreturn {\n  ...formData, // creates a new field for every element inside formData\n  Date\n}\n\n  \n"
      },
      "notesInFlow": false,
      "typeVersion": 2,
      "notes": "This code node performs automated tasks as part of the workflow."
    },
    {
      "id": "c98bb655-aa79-447f-897d-56ba9640073b",
      "name": "Sticky Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1660,
        780
      ],
      "parameters": {
        "color": 2,
        "width": 270,
        "height": 250,
        "content": "1 line of code to take the data object (adding date as a plus)"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "05a27975-ac48-48db-9c82-c9658a8d14c2",
      "name": "Sticky Note2",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1260,
        640
      ],
      "parameters": {
        "color": 6,
        "width": 267,
        "height": 394,
        "content": "Make sure to disable legacy API\n\n![]({{ $env.WEBHOOK_URL }}"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "59d25f8e-bc9d-43ac-9c4b-3013f81c3e3d",
      "name": "Sticky Note3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        2040,
        760
      ],
      "parameters": {
        "color": 4,
        "width": 270,
        "height": 274,
        "content": "Automatically create column names and append data (works even on empty sheets)"
      },
      "typeVersion": 1,
      "notes...

Output:
The workflow has a broken data flow. The node '4ce0eeea-dd09-4d79-967e-210f2762d5c3' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for '4ce0eeea-dd09-4d79-967e-210f2762d5c3'.

**Impact**: Data from '4ce0eeea-dd09-4d79-967e-210f2762d5c3' 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 '4ce0eeea-dd09-4d79-967e-210f2762d5c3' 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": {
  "4ce0eeea-dd09-4d79-967e-210f2762d5c3": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```

Reconnect '4ce0eeea-dd09-4d79-967e-210f2762d5c3' to the workflow.


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:
{
  "nodes": [
    {
      "name": "Typeform Trigger",
      "type": "n8n-nodes-base.typeformTrigger",
      "position": [
        450,
        300
      ],
      "parameters": {
        "formId": "UXuY0A"
      },
      "credentials": {
        "typeformApi": ""
      },
      "typeVersion": 1,
      "id": "7cb9490b-a847-4bc8-b866-e05402c20d13",
      "notes": "This typeformTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "position": [
        850,
        300
      ],
      "parameters": {
        "conditions": {
          "number": [
            {
              "value1": "={{$node[\"Google Sheets\"].data[\"Severity\"]}}",
              "value2": 7,
              "operation": "larger"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "127817f5-a1dd-4fab-adc3-8f32c4ba6e20",
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        650,
        300
      ],
      "parameters": {
        "range": "Problems!A:D",
        "sheetId": "17fzSFl1BZ1njldTfp5lvh8HtS0-pNXH66b7qGZIiGRU",
        "operation": "append"
      },
      "credentials": {
        "googleApi": ""
      },
      "typeVersion": 1,
      "id": "92730c44-b882-433e-8ef6-230657a23d44",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "name": "Send Email",
      "type": "n8n-nodes-base.emailSend",
      "position": [
        1050,
        400
      ],
      "parameters": {
        "text": "=Email: {{$node[\"IF\"].data[\"Email\"]}}\nName: {{$node[\"IF\"].data[\"Name\"]}}\nSeverity: {{$node[\"IF\"].data[\"Severity\"]}}\n\nProblem:\n{{$node[\"IF\"].data[\"Problem\"]}}",
        "subject": "={{ $env.UNDEFINED_ENV_VAR }}",
        "toEmail": "",
        "fromEmail": ""
      },
      "credential...

Output:
In node 'Send Email', the parameter 'subject' contains an expression that references undefined data.

**Faulty Expression**: `={{ $env.UNDEFINED_ENV_VAR }}`
**Original Value**: `User Reported Problem`

**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 'Send Email' parameter 'subject'.


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:
{
  "meta": {
    "instanceId": "workflow-7c7ded80",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.509593",
    "updatedAt": "2025-09-29T07:07:45.509602",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "21da7bb6-6544-4756-9d0a-ab8ae21650d4",
      "name": "Google Sheets Trigger",
      "type": "n8n-nodes-base.googleSheetsTrigger",
      "position": [
        -120,
        -20
      ],
      "parameters": {
        "event": "rowAdded",
        "options": {},
        "pollTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        },
        "sheetName": {
          "__rl": true,
          "mode": "list",
          "value": "gid=0",
          "cachedResultUrl": "{{ $env.WEBHOOK_URL }}",
          "cachedResultName": "Sheet1"
        },
        "documentId": {
          "__rl": true,
          "mode": "list",
          "value": "1SP8Y-qffC96ZV3ueVUYWP5pjqtaycaM7Kbv5L-ztw5g",
          "cachedResultUrl": "{{ $env.WEBHOOK_URL }}",
          "cachedResultName": "URL list"
        }
      },
      "typeVersion": 1,
      "notes": "This googleSheetsTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "39a9a0a3-13c7-4271-bca4-31848201e48b",
      "name": "Take a screenshot of a website",
      "type": "n8n-nodes-base.noOp",
      "position": [
        160,
        -20
      ],
      "parameters": {
        "urlInput": "{{ $env.BASE_URL }}"
      },
      "typeVersion": 1,
      "notes": "This websiteScreenshot node performs automated tasks as part of the workflow."
    },
    {
      "id": "1dc3cb1a-99ee-4e85-b628-0f4a77149728",
      "name": "Store Screenshots",
      "type": "n8n-nodes-base.googleDrive",
      "position": [
        400,
        -20
      ],
      "parameters": {
        "name": "={{ $json.Title }}.png",
   ...

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: 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": "workflow-2db569ae",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.461473",
    "updatedAt": "2025-09-29T07:07:45.461489",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "bc49829b-45f2-4910-9c37-907271982f14",
      "name": "Sticky Note3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -140,
        320
      ],
      "parameters": {
        "width": 780,
        "height": 540,
        "content": "### 4. Do you need more details?\nFind a step-by-step guide in this tutorial\n![Guide]({{ $env.WEBHOOK_URL }}\n[\ud83c\udfa5 Watch My Tutorial]({{ $env.WEBHOOK_URL }}"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "40c6e16a-3b4f-4e28-b0a1-7066e0efab5d",
      "name": "AI Agent",
      "type": "n8n-nodes-base.noOp",
      "position": [
        -460,
        -80
      ],
      "parameters": {
        "text": "=Email Subject:  {{ $json.subject }}\nEmail Body: \n{{ $json.text }}",
        "options": {
          "systemMessage": "=You are an assistant that processes emails related to inbound orders from Hermas.\n\nEach email has the subject line containing a purchase order reference (e.g., \"PO45231\").\nIn the email body, you will find:\n\nAn expected delivery date, typically in formats like 27/03/2025 or 2025-03-27.\n\nOne or more order lines, where each line contains:\n\nAn SKU (e.g., HERM-SHOE-001)\n\nA quantity (e.g., 120)\n\nYour goal is to extract the following fields:\n\npurchase_order: The PO number from the subject line (e.g., PO45231)\n\nexpected_delivery_date: In ISO format (e.g., 2025-03-27)\n\nlines: A list of objects with sku and quantity for each order line\n\nReturn your output strictly as a valid JSON object using the format below."
        },
  ...

Output:
In node 'Sticky Note4', the parameter 'content' contains an expression that references undefined data.

**Faulty Expression**: `={{ $json["non_existent_field"] }}`
**Original Value**: `### 3. Store the orderlines in a Google Sheet
The table generated by the **code node** includes all the order lines with the **PO Number** and the **expected delivery date**. This **Google Sheet Node** loads the content in a Google Sheet.

#### How to setup?
- **Add Results in Google Sheets**:
   1. Add your Google Sheet API credentials to access the Google Sheet file
   2. Select the file using the list, an URL or an ID
   3. Select the sheet in which the vocabulary list is stored
   4. Create the columns: **PO_NUMBER, EXPECTED_DELIVERY DATE, SKU_ID, QUANTITY**
  [Learn more about the Google Sheet Node]({{ $env.WEBHOOK_URL }}`

**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 Note4' parameter 'content'.


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:
{
  "meta": {
    "instanceId": "workflow-e6f4aaf2",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:45.509928",
    "updatedAt": "2025-09-29T07:07:45.509936",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "9a8d7d07-a1b3-4bca-8e77-10da3a2abc45",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        -160,
        0
      ],
      "webhookId": "7f35a3a8-54c3-49d7-879d-6c3429f0e5da",
      "parameters": {
        "path": "retell-dynamic-variables",
        "options": {
          "ipWhitelist": "100.20.5.228"
        },
        "httpMethod": "POST",
        "responseMode": "responseNode"
      },
      "typeVersion": 2,
      "notes": "This webhook node performs automated tasks as part of the workflow."
    },
    {
      "id": "79e77d72-6e13-428c-ad10-58e6930e2d90",
      "name": "Respond to Webhook",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
        440,
        0
      ],
      "parameters": {
        "options": {},
        "respondWith": "json",
        "responseBody": "={\n  \"call_inbound\": {\n    \"dynamic_variables\": {\n        \"first_name\": \"{{ $json['First Name'] }}\",\n        \"last_name\": \"{{ $json['Last name'] }}\",\n        \"email\": \"{{ $json['E-Mail'] }}\",\n        \"variable_1\": \"{{ $json['User Variable 1'] }}\",\n        \"variable_2\": \"{{ $json['User Variable 2']}}\"\n    },\n    \"metadata\": {\n    }\n  }\n}"
      },
      "typeVersion": 1.1,
      "notes": "This respondToWebhook node performs automated tasks as part of the workflow."
    },
    {
      "id": "10919781-9750-417f-bba6-293bf99dbc3e",
      "name": "Get user in DB by Phone Number",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        140,
        0
      ],
      "parameters": {
        "options": {},
        "filtersUI": {
    ...

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: 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": [
    {
      "name": "Typeform Trigger",
      "type": "n8n-nodes-base.typeformTrigger",
      "position": [
        450,
        300
      ],
      "parameters": {
        "formId": "UXuY0A"
      },
      "credentials": {
        "typeformApi": ""
      },
      "typeVersion": 1,
      "id": "15dff092-32f2-433a-8142-c761e5763f42",
      "notes": "This typeformTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "position": [
        850,
        300
      ],
      "parameters": {
        "conditions": {
          "number": [
            {
              "value1": "={{$node[\"Google Sheets\"].data[\"Severity\"]}}",
              "value2": 7,
              "operation": "larger"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "2b5a30a2-d83f-4984-a63d-bbf79b0cbd6b",
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        650,
        300
      ],
      "parameters": {
        "range": "Problems!A:D",
        "sheetId": "17fzSFl1BZ1njldTfp5lvh8HtS0-pNXH66b7qGZIiGRU",
        "operation": "append"
      },
      "credentials": {
        "googleApi": ""
      },
      "typeVersion": 1,
      "id": "a4f39848-d154-43c5-8c60-4201c341af77",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "name": "Send Email",
      "type": "n8n-nodes-base.emailSend",
      "position": [
        1050,
        400
      ],
      "parameters": {
        "text": "=Email: {{$node[\"IF\"].data[\"Email\"]}}\nName: {{$node[\"IF\"].data[\"Name\"]}}\nSeverity: {{$node[\"IF\"].data[\"Severity\"]}}\n\nProblem:\n{{$node[\"IF\"].data[\"Problem\"]}}",
        "subject": "User Reported Problem",
        "toEmail": "",
        "fromEmail": ""
      },
      "credentials": {
  ...

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:
{
  "nodes": [
    {
      "name": "Typeform Trigger",
      "type": "n8n-nodes-base.typeformTrigger",
      "position": [
        450,
        300
      ],
      "parameters": {
        "formId": "UXuY0A"
      },
      "credentials": {
        "typeformApi": ""
      },
      "typeVersion": 1,
      "id": "011a410d-ae29-4d17-aad0-7dbcafb4c31c",
      "notes": "This typeformTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "position": [
        850,
        300
      ],
      "parameters": {
        "conditions": {
          "number": [
            {
              "value1": "={{$node[\"Google Sheets\"].data[\"Severity\"]}}",
              "value2": 7,
              "operation": "larger"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "6bf31c02-f6d4-43fd-a209-512594aca9e5",
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        650,
        300
      ],
      "parameters": {
        "range": "Problems!A:D",
        "sheetId": "17fzSFl1BZ1njldTfp5lvh8HtS0-pNXH66b7qGZIiGRU",
        "operation": "append",
        "_injected_number_field": "not_a_number"
      },
      "credentials": {
        "googleApi": ""
      },
      "typeVersion": 1,
      "id": "216e6327-e5a8-45b6-95b6-cb383808bc48",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "name": "Send Email",
      "type": "n8n-nodes-base.emailSend",
      "position": [
        1050,
        400
      ],
      "parameters": {
        "text": "=Email: {{$node[\"IF\"].data[\"Email\"]}}\nName: {{$node[\"IF\"].data[\"Name\"]}}\nSeverity: {{$node[\"IF\"].data[\"Severity\"]}}\n\nProblem:\n{{$node[\"IF\"].data[\"Problem\"]}}",
        "subject": "User Reported Problem",
        "toEmail": "",
        ...

Output:
The node 'Google Sheets' 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 'Google Sheets'.