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:
{
  "id": "zlHbtHIcCZ9enKwg",
  "meta": {
    "instanceId": "workflow-ef0f9c8a",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.783163",
    "updatedAt": "2025-09-29T07:07:50.783178",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "v1 helper - Find params with affected expressions",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "b3dd44ca-960f-4689-9545-30a05dc0441e",
      "name": "When clicking \"Execute Workflow\"",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        580,
        320
      ],
      "parameters": {},
      "typeVersion": 1,
      "notes": "This manualTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "96db239d-05b6-4e1d-b101-e66c2a9708f6",
      "name": "n8n",
      "type": "n8n-nodes-base.n8n",
      "position": [
        800,
        320
      ],
      "parameters": {
        "filters": {
          "activeWorkflows": true
        }
      },
      "credentials": {
        "n8nApi": {
          "id": "hcJ2iZYYgs54eCaT",
          "name": "n8n account"
        }
      },
      "typeVersion": 1,
      "notes": "This n8n node performs automated tasks as part of the workflow."
    },
    {
      "id": "b2286f6b-ba37-433c-b22a-95032bc25b6e",
      "name": "Find params with affected expressions",
      "type": "n8n-nodes-base.code",
      "position": [
        1040,
        320
      ],
      "parameters": {
        "jsCode": "const AFFECTED_EXTENSIONS = ['beginningOf', 'endOfMonth', 'minus', 'plus'];\n\nconst isExpression = (value) => typeof value === 'string' && value.startsWith('={{');\n\nconst containsAny = (str, substrings) => {\n  for (const substring of substrings) {\n    if (str.includes(substring)) return true;\n  }\n  \n  return false;\n}\n\nconst isAffected =...

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: 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": "LMMle9xFHQxXUWQy",
  "meta": {
    "instanceId": "workflow-14b750ac",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.833239",
    "updatedAt": "2025-09-29T07:07:50.833257",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Airtable markdown to html",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "ae8fad3b-7108-4a7a-a6d6-13e249c41ad7",
      "name": "Check if it's 1 record or all records - Airtable",
      "type": "n8n-nodes-base.if",
      "position": [
        1460,
        760
      ],
      "parameters": {
        "options": {},
        "conditions": {
          "options": {
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
          },
          "combinator": "and",
          "conditions": [
            {
              "id": "985d1b48-78d1-4cd8-bd89-c4c2cb8f1e94",
              "operator": {
                "type": "string",
                "operation": "exists",
                "singleValue": true
              },
              "leftValue": "={{ $json.query.recordId }}",
              "rightValue": "all"
            }
          ]
        }
      },
      "typeVersion": 2,
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "id": "c2a99d03-3570-4956-8e1e-06d6d72af7cd",
      "name": "Get single record from airtable",
      "type": "n8n-nodes-base.airtable",
      "position": [
        1660,
        740
      ],
      "parameters": {
        "id": "={{ $json.query.recordId }}",
        "base": {
          "__rl": true,
          "mode": "list",
          "value": "appk2iZaWQLO3Tqvx",
          "cachedResultUrl": "{{ $env.WEBHOOK_URL }}",
          "cachedResultName": "360Creators"
        },
        "table": {
          "__rl": tr...

Output:
The workflow has a broken data flow. The node '5cffbbdb-936c-4aa9-8e2d-9b8868f7db03' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for '5cffbbdb-936c-4aa9-8e2d-9b8868f7db03'.

**Impact**: Data from '5cffbbdb-936c-4aa9-8e2d-9b8868f7db03' 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 '5cffbbdb-936c-4aa9-8e2d-9b8868f7db03' 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": {
  "5cffbbdb-936c-4aa9-8e2d-9b8868f7db03": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```

Reconnect '5cffbbdb-936c-4aa9-8e2d-9b8868f7db03' 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:
{
  "id": "9",
  "name": "Coffee Bot (Matrix)",
  "nodes": [
    {
      "name": "Greetings",
      "type": "n8n-nodes-base.matrix",
      "position": [
        670,
        240
      ],
      "parameters": {
        "text": "\ud83d\udc4b Happy Monday Groups for this week's virtual coffee are:",
        "roomId": "Enter your Room ID"
      },
      "credentials": {
        "matrixApi": "Matrix Creds"
      },
      "typeVersion": 1,
      "id": "59dd59af-bed8-41ed-aa22-d271096565c1",
      "notes": "This matrix node performs automated tasks as part of the workflow."
    },
    {
      "name": "Employees in coffee chat channel",
      "type": "n8n-nodes-base.matrix",
      "position": [
        880,
        240
      ],
      "parameters": {
        "roomId": "Enter your Room ID",
        "filters": {
          "membership": ""
        },
        "resource": "roomMember"
      },
      "credentials": {
        "matrixApi": "Enter Your Matrix Credentials"
      },
      "typeVersion": 1,
      "id": "2ba21034-eea2-44ed-aa64-8001b870c35c",
      "notes": "This matrix node performs automated tasks as part of the workflow."
    },
    {
      "name": "Weekly trigger on monday1",
      "type": "n8n-nodes-base.cron",
      "position": [
        480,
        240
      ],
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "hour": 10,
              "mode": "everyWeek"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "02391d9a-7d26-42a5-bf9c-596663867e1b",
      "notes": "This cron node performs automated tasks as part of the workflow."
    },
    {
      "name": "Divide into groups",
      "type": "n8n-nodes-base.function",
      "notes": "This still needs to be reconfigured to grab the information from the second Matrix node. Have an issue with the ",
      "position": [
        1090,
        240
      ],
      "parameters": {
        "functionCode": "={{ $json[\"non_existent_field\"] }}"
      },
 ...

Output:
In node 'Divide into groups', the parameter 'functionCode' contains an expression that references undefined data.

**Faulty Expression**: `={{ $json["non_existent_field"] }}`
**Original Value**: `const ideal_group_size = 3;
let groups = [];
let data_as_array = [];
let newItems = [];

// Take all the users and add them to an array
for (let j = 0; j < items.length; j++) {
  data_as_array.push({username: items[j].json.user_id});
}

// Fisher-Yates (aka Knuth) Shuffle
function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex;

  // While there remain elements to shuffle...
  while (0 !== currentIndex) {

    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;

    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  return array;
}

// Randomize the sequence of names in the array
data_as_array = shuffle(data_as_array);

// Create groups of ideal group size (3)
for (let i = 0; i < data_as_array.length; i += ideal_group_size) {
  groups.push(data_as_array.slice(i, i + ideal_group_size));
}

// Make sure that no group has just one person. If it does, take
// one from previous group and add it to that group
for (let k = 0; k < groups.length; k++) {
  if (groups[k].length === 1) {
    groups[k].push(groups[k-1].shift());
  }
}

for (let l = 0; l < groups.length; l++) {
    newItems.push({json: {groupsUsername: groups[l].map(a=> a.username)}})
}

return newItems;
`

**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 'Divide into groups' parameter 'functionCode'.


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": [
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        650,
        200
      ],
      "parameters": {
        "message": "={{$json[\"contact\"][\"firstName\"]}} from {{$json[\"contact\"][\"company\"]}} has replied back to your campaign.",
        "channelId": "qx9yo1i9z3bg5qcy5a1oxnh69c",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "d389717b-5f3a-4a82-8f16-e02570231950",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "name": "Emelia Trigger",
      "type": "n8n-nodes-base.emeliaTrigger",
      "position": [
        450,
        200
      ],
      "webhookId": "f53bc370-a8cb-4748-8f81-be7ae9b94972",
      "parameters": {
        "events": [
          "replied"
        ],
        "campaignId": "6054d068b374b64365740101"
      },
      "credentials": {
        "emeliaApi": "Emelia API Credentials"
      },
      "typeVersion": 1,
      "id": "ebeb78b1-b7e3-48db-ae97-5d420a4d59e5",
      "notes": "This emeliaTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-3be24b33",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    },
    {
      "parameters": {
        "url": "https://api.example.com/data",
        "method": "GET",
        "options": {}
      },
      "name": "HTTP Request",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
        450,
        300
      ]
    }
  ],
  "connections": {},
  "name": "Mattermost Workflow",
  "description": "Automated workflow: Mattermost Workflow. This workflow processes data and performs automated tasks.",
  "setti...

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: Missing Credentials

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        650,
        200
      ],
      "parameters": {
        "message": "={{$json[\"contact\"][\"firstName\"]}} from {{$json[\"contact\"][\"company\"]}} has replied back to your campaign.",
        "channelId": "qx9yo1i9z3bg5qcy5a1oxnh69c",
        "attachments": [],
        "otherOptions": {}
      },
      "typeVersion": 1,
      "id": "12911f1d-90a8-42d1-be65-adc0a1dd978f",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "name": "Emelia Trigger",
      "type": "n8n-nodes-base.emeliaTrigger",
      "position": [
        450,
        200
      ],
      "webhookId": "f53bc370-a8cb-4748-8f81-be7ae9b94972",
      "parameters": {
        "events": [
          "replied"
        ],
        "campaignId": "6054d068b374b64365740101"
      },
      "credentials": {
        "emeliaApi": "Emelia API Credentials"
      },
      "typeVersion": 1,
      "id": "b3a426c6-bc05-4cbb-9142-0e7a7544f5fd",
      "notes": "This emeliaTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-167e662e",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "connections": {},
  "name": "Mattermost Workflow",
  "description": "Automated workflow: Mattermost Workflow. This workflow processes data and performs automated tasks.",
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "retryCount": 3,
    "retryDelay": 1000
  },
  "meta": {
    "instanceId": "workflow-2bcb736a",...

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

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "mattermostApi": "Mattermost Credentials"
}
```

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

Add credentials configuration to the 'Mattermost' node.


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:
{
  "nodes": [
    {
      "name": "n8n Trigger",
      "type": "n8n-nodes-base.n8nTrigger",
      "position": [
        450,
        200
      ],
      "parameters": {
        "events": [
          "init"
        ]
      },
      "typeVersion": 1,
      "id": "ff23cad0-e0cd-441d-aeaa-71e6b8f435c3",
      "notes": "This n8nTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        650,
        200
      ],
      "parameters": {
        "message": "=Your n8n instance started at {{$json[\"timestamp\"]}}",
        "channelId": "toyi3uoycf8rirtm7d5jm15sso",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "fe7738e5-56b8-4d21-9283-fedf397b7bd0",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-4871e24f",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "connections": {},
  "name": "N8Ntrigger Workflow",
  "description": "Automated workflow: N8Ntrigger Workflow. This workflow processes data and performs automated tasks.",
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "retryCount": 3,
    "retryDelay": 1000
  },
  "meta": {
    "instanceId": "workflow-10102cfe",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.857107",
    "updatedAt": "2025-09-29T07:07:50.857118",
    "owner": "n8n-user",
    "license": "MIT",
    "cate...

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: Missing Credentials

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        490,
        460
      ],
      "webhookId": "c0345765-4488-4ac8-a9da-02f647dd2b90",
      "parameters": {
        "path": "c0345765-4488-4ac8-a9da-02f647dd2b90",
        "options": {}
      },
      "typeVersion": 1,
      "id": "node-609fdde7"
    },
    {
      "name": "Set",
      "type": "n8n-nodes-base.set",
      "position": [
        690,
        460
      ],
      "parameters": {
        "values": {
          "string": [
            {
              "name": "Message",
              "value": "Hello!"
            }
          ]
        },
        "options": {},
        "keepOnlySet": true
      },
      "typeVersion": 1,
      "id": "node-d069e07a"
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        690,
        610
      ],
      "parameters": {
        "message": "=The workflow {{$workflow.name}}, was updated.",
        "channelId": "toyi3uoycf8rirtm7d5jm15sso",
        "attachments": [],
        "otherOptions": {}
      },
      "typeVersion": 1,
      "id": "node-0f0a289f"
    },
    {
      "name": "Workflow Trigger",
      "type": "n8n-nodes-base.workflowTrigger",
      "position": [
        490,
        610
      ],
      "parameters": {
        "events": [
          "update"
        ]
      },
      "typeVersion": 1,
      "id": "node-a1110729"
    },
    {
      "id": "error-8259e0cf",
      "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",
    "executi...

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

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "mattermostApi": "Mattermost Credentials"
}
```

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


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": [
    {
      "name": "Notion Trigger",
      "type": "n8n-nodes-base.notionTrigger",
      "position": [
        270,
        350
      ],
      "parameters": {
        "event": "pageAddedToDatabase",
        "pollTimes": {
          "item": [
            {
              "mode": "everyHour"
            }
          ]
        },
        "databaseId": "6ea34c0d-67e8-4614-ad5c-68c665a34763"
      },
      "credentials": {
        "notionApi": ""
      },
      "typeVersion": 1,
      "id": "77521945-4205-4070-bf13-caa28a4bf877",
      "notes": "This notionTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "position": [
        470,
        350
      ],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "={{$json[\"Team\"]}}",
              "value2": "Marketing"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "fb9311b5-9206-46c3-8f18-90eeb1b31135",
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        670,
        250
      ],
      "parameters": {
        "message": "=New meeting notes were added.\nAgenda: {{$json[\"Agenda\"]}}\nDate: {{$json[\"Date\"][\"start\"]}}\nLink: {{ $env.WEBHOOK_URL }}{{$json[\"id\"].replace(/-/g,'')}}",
        "channelId": "64cae1bh6pggtcupfd4ztwby4r",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": ""
      },
      "typeVersion": 1,
      "id": "f2ef0c27-9bae-4224-b735-be78d91cadb0",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "name": "NoOp",
      "type": "n8n-nodes-base.noOp",
      "position": [
        668,
        495
      ],
      "parameters": {},
      "typeVersion": 1,
      "id": ...

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:
{
  "id": "188",
  "name": "Send a message on Mattermost when an order is created in WooCommerce",
  "nodes": [
    {
      "name": "WooCommerce Trigger",
      "type": "n8n-nodes-base.wooCommerceTrigger",
      "position": [
        550,
        260
      ],
      "webhookId": "84960a7c-cb69-4dfb-a5ed-aac12e0efbf8",
      "parameters": {
        "event": "={{ $node.NonExistentNode.json.data }}"
      },
      "credentials": {
        "wooCommerceApi": "woocommerce"
      },
      "typeVersion": 1,
      "id": "86bfe8a2-c555-4067-ad52-e796d675dda3",
      "notes": "This wooCommerceTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        750,
        260
      ],
      "parameters": {
        "message": "={{$node[\"WooCommerce Trigger\"].json[\"billing\"][\"first_name\"]}} bought {{$node[\"WooCommerce Trigger\"].json[\"line_items\"][0][\"name\"]}}!",
        "channelId": "pj1p95ebei8g3ro5p84kxxuuio",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "e062f8d3-68f9-40c6-8fd0-63a28dc60966",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-138d9d8f",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "active": false,
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "retryCount": 3,
    "retryDelay": 1000
  },
  "connections": {},
  "des...

Output:
In node 'WooCommerce Trigger', the parameter 'event' contains an expression that references undefined data.

**Faulty Expression**: `={{ $node.NonExistentNode.json.data }}`
**Original Value**: `order.created`

**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 'WooCommerce Trigger' parameter 'event'.


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" "18",
  "name": "Gender Inclusive Language",
  "nodes": [
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        150,
        450
      ],
      "parameters": {
        "path": "webhook",
        "options": {},
        "httpMethod": "POST"
      },
      "typeVersion": 1,
      "id": "node-30548f96"
    },
    {
      "name": "Mattermost1",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        550,
        300
      ],
      "parameters": {
        "message": "May I suggest \"folks\" or \u201cy'all\u201d? We use gender inclusive language here. \ud83d\ude04",
        "channelId": "={{$node[\"Webhook\"].json[\"body\"][\"channel_id\"]}}",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "n8n Mattermost - Bot"
      },
      "typeVersion": 1,
      "id": "node-c149e4c9"
    },
    {
      "name": "IF",
      "type": "n8n-nodes-base.if",
      "position": [
        340,
        450
      ],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "={{$node[\"Webhook\"].json[\"body\"][\"text\"]}}",
              "value2": "guys",
              "operation": "contains"
            },
            {
              "value1": "={{$node[\"Webhook\"].json[\"body\"][\"text\"]}}",
              "value2": "Guys",
              "operation": "contains"
            },
            {
              "value1": "={{$node[\"Webhook\"].json[\"body\"][\"text\"]}}",
              "value2": "bros",
              "operation": "contains"
            },
            {
              "value1": "={{$node[\"Webhook\"].json[\"body\"][\"text\"]}}",
              "value2": "Bros",
              "operation": "contains"
            },
            {
              "value1": "={{$node[\"Webhook\"].json[\"body\"][\"text\"]}}",
              "value2": "dudes",
              "operation": "contains"
            },
            {
           ...

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: 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:
{
  "id": "1",
  "name": "Twitter notifications",
  "nodes": [
    {
      "name": "Twitter",
      "type": "n8n-nodes-base.twitter",
      "position": [
        610,
        260
      ],
      "parameters": {
        "operation": "search",
        "searchText": "n8n_io",
        "additionalFields": {
          "resultType": "recent"
        }
      },
      "credentials": {
        "twitterOAuth1Api": "Twitter"
      },
      "typeVersion": 1,
      "id": "67d6959e-44e9-486e-9552-e441eb9df205",
      "notes": "This twitter node performs automated tasks as part of the workflow."
    },
    {
      "name": "Cron",
      "type": "n8n-nodes-base.cron",
      "position": [
        410,
        260
      ],
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "9df9c0d6-56c0-463f-b063-9a88870f4654",
      "notes": "This cron node performs automated tasks as part of the workflow."
    },
    {
      "name": "Function",
      "type": "n8n-nodes-base.function",
      "position": [
        940,
        260
      ],
      "parameters": {
        "functionCode": "const new_items = [];\nconst data = this.getWorkflowStaticData('node');\n\ndata.ids = data.ids || [];\n\nfor (var i=0; i<items.length; i++) {\n  if (data.ids.includes(items[i].json.id)) {\n    break;\n  } else {\n    new_items.push({json: {id: items[i].json.id, url: items[i].json.url, tweet: items[i].json.tweet, username: items[i].json.username, photo: items[i].json.photo, name: items[i].json.name, color: items[i].json.color}});\n  }\n}\n\ndata.ids = items.map(item => item.json.id)\nreturn new_items;\n"
      },
      "typeVersion": 1,
      "id": "d531361a-0925-4cff-b0f9-03dcb100d2c2",
      "notes": "This function node performs automated tasks as part of the workflow."
    },
    {
      "name": "Set",
      "type": "n8n-nodes-base.set",
      "position": [
        780,
   ...

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: Missing Credentials

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        450,
        300
      ],
      "webhookId": "213324b6-b84d-42f9-af3b-42804cc71cd1",
      "parameters": {
        "path": "213324b6-b84d-42f9-af3b-42804cc71cd1",
        "options": {},
        "httpMethod": "POST"
      },
      "typeVersion": 1,
      "id": "node-fcad6e6a"
    },
    {
      "name": "PagerDuty",
      "type": "n8n-nodes-base.pagerDuty",
      "position": [
        650,
        300
      ],
      "parameters": {
        "email": "n8ndocsburner@gmail.com",
        "operation": "update",
        "incidentId": "={{$json[\"body\"][\"context\"][\"pagerduty_incident\"]}}",
        "updateFields": {
          "status": "acknowledged"
        }
      },
      "credentials": {
        "pagerDutyApi": "PagerDuty Credentials"
      },
      "typeVersion": 1,
      "id": "node-1faba484"
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        850,
        300
      ],
      "parameters": {
        "message": "\ud83d\udcaa\ud83c\udffc Incident status has been changed to Acknowledged on PagerDuty.",
        "channelId": "={{$node[\"Webhook\"].json[\"body\"][\"channel_id\"]}}",
        "attachments": [],
        "otherOptions": {}
      },
      "typeVersion": 1,
      "id": "node-00a74c00"
    },
    {
      "id": "error-c944d399",
      "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,
...

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

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "mattermostApi": "Mattermost Credentials"
}
```

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


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": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        1050,
        200
      ],
      "parameters": {
        "message": "\ud83d\udcaa This issue got closed in PagerDuty and Jira.",
        "channelId": "={{$node[\"Webhook\"].json[\"body\"][\"channel_id\"]}}",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "node-bef6ea0b"
    },
    {
      "name": "Mattermost1",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        1050,
        400
      ],
      "parameters": {
        "message": "=\ud83c\udf89 The incident ({{$node[\"PagerDuty\"].json[\"summary\"]}}) was resolved by the lovely folks in the on-call team!",
        "channelId": "k1h3du9r9byyfg7sys8ib6p3ey",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "node-e7b6ffe2"
    },
    {
      "name": "Jira",
      "type": "n8n-nodes-base.jira",
      "position": [
        850,
        300
      ],
      "parameters": {
        "issueKey": "={{$node[\"Webhook\"].json[\"body\"][\"context\"][\"jira_key\"]}}",
        "operation": "update",
        "updateFields": {
          "statusId": "31"
        }
      },
      "credentials": {
        "jiraSoftwareCloudApi": "jira"
      },
      "typeVersion": 1,
      "id": "node-ab144dc7"
    },
    {
      "name": "PagerDuty",
      "type": "n8n-nodes-base.pagerDuty",
      "position": [
        650,
        300
      ],
      "parameters": {
        "email": "n8ndocsburner@gmail.com",
        "operation": "update",
        "incidentId": "={{$json[\"body\"][\"context\"][\"pagerduty_incident\"]}}",
        "updateFields": {
          "status": "resolved"
        }
      },
      "credentials": {
        "pagerDutyApi": "PagerDuty Cred...

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: Missing Credentials

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "Twilio",
      "type": "n8n-nodes-base.twilio",
      "position": [
        900,
        300
      ],
      "parameters": {
        "message": "=The workflow named '{{$node[\"Error Trigger\"].json[\"workflow\"][\"name\"]}}' with the ID {{$node[\"Error Trigger\"].json[\"workflow\"][\"id\"]}} has encountered an error."
      },
      "credentials": {
        "twilioApi": "Twilio"
      },
      "typeVersion": 1,
      "id": "39d55a2f-dfa5-4f5b-abc2-1bb6c6ae47b1",
      "notes": "This twilio node performs automated tasks as part of the workflow."
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        650,
        300
      ],
      "parameters": {
        "message": "=The workflow named '{{$json[\"workflow\"][\"name\"]}}' with the ID {{$json[\"workflow\"][\"id\"]}} has encountered an error. The last node that was executed was {{$json[\"execution\"][\"lastNodeExecuted\"]}}.",
        "attachments": [],
        "otherOptions": {}
      },
      "typeVersion": 1,
      "id": "9fff33e1-61f8-42ed-966a-e06c55c5dbf2",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "name": "Error Trigger",
      "type": "n8n-nodes-base.errorTrigger",
      "position": [
        450,
        300
      ],
      "parameters": {},
      "typeVersion": 1,
      "id": "966c7e6c-f675-4833-ab5c-32d85383e7f5",
      "notes": "This errorTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-c242eb54",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "connections": {},
  "name": "Twilio Workflow",
  "description": "Automated workflow: Twilio Workflow. This workflow processes data and performs automat...

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

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "mattermostApi": "Mattermost"
}
```

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


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:
{
  "nodes": [
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        590,
        400
      ],
      "webhookId": "822cce61-ff5f-4cea-b8ba-1822651786e3",
      "parameters": {
        "path": "822cce61-ff5f-4cea-b8ba-1822651786e3",
        "options": {},
        "httpMethod": "POST"
      },
      "typeVersion": 1,
      "id": "node-ed71ce56"
    },
    {
      "name": "Set",
      "type": "n8n-nodes-base.set",
      "position": [
        780,
        400
      ],
      "parameters": {
        "values": {
          "string": [
            {
              "name": "amudhan",
              "value": "n8n-rocks"
            }
          ]
        },
        "options": {},
        "keepOnlySet": true
      },
      "typeVersion": 1,
      "id": "node-56445161"
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        990,
        400
      ],
      "parameters": {
        "message": "=Join me in a video call:",
        "channelId": "={{$node[\"Webhook\"].json[\"body\"][\"channel_id\"]}}",
        "attachments": [
          {
            "title": "=https://whereby.com/{{$json[$node[\"Webhook\"].json[\"body\"][\"user_name\"]]}}",
            "title_link": "=https://whereby.com/{{$json[$node[\"Webhook\"].json[\"body\"][\"user_name\"]]}}"
          }
        ],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "mm_creds"
      },
      "typeVersion": 1,
      "id": "node-2ed66b71"
    },
    {
      "id": "error-94886904",
      "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": "workflowsFrom...

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": "Cron",
      "type": "n8n-nodes-base.cron",
      "position": [
        450,
        300
      ],
      "parameters": {
        "triggerTimes": {
          "item": [
            {
              "mode": "custom",
              "cronExpression": "0 0 17 28 9 *"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "9f33199b-30d3-4b12-a499-7521fda65865",
      "notes": "This cron node performs automated tasks as part of the workflow."
    },
    {
      "name": "Google Sheets",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        650,
        300
      ],
      "parameters": {
        "range": "Sessions!A:D",
        "options": {},
        "sheetId": "1nlnsTQKGgQZN-Rtd07K9bn0ROm0aFBC2O4kzM2YaTBI",
        "authentication": "{{ $credentials.oAuth2 }}"
      },
      "credentials": {
        "googleSheetsOAuth2Api": "n8ndocsburner-googlesheets"
      },
      "typeVersion": 1,
      "id": "514db0ea-e2b4-4cb6-944c-58290f629f95",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        850,
        300
      ],
      "parameters": {
        "message": "= Hey @channel, we hope you had a great time at **{{$node[\"Google Sheets\"].json[\"Session\"]}}**.\nLet us know how we did by sharing your feedback with us on the link below!",
        "channelId": "={{$node[\"Google Sheets\"].json[\"Mattermost Channel ID\"]}}",
        "attachments": [
          {
            "title": "=Feedback Form - {{$node[\"Google Sheets\"].json[\"Session\"]}}",
            "title_link": "={{$node[\"Google Sheets\"].json[\"Feedback Form Link\"]}}"
          }
        ],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "mm_failedmachine"
      },
      "typeVersion": 1,
      "id": "2cf7a30c-6c5a-40d3-9488-19d54bfb4859",
      "notes": "This ma...

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:
{
  "nodes": [
    {
      "id": "trigger-2690b6f5",
      "name": "Manual Trigger",
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        100,
        100
      ],
      "parameters": {}
    },
    {
      "name": "Send message",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        910,
        260
      ],
      "parameters": {
        "message": "=New information was added to your Google Sheet.\nID: {{$json[\"id\"]}}\nName: {{$json[\"name\"]}}\nEmail: {{$json[\"email\"]}}",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "36772d01-6ba3-4599-898b-0fa8df6b42be",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "name": "Check if new data",
      "type": "n8n-nodes-base.function",
      "position": [
        710,
        260
      ],
      "parameters": {
        "functionCode": "const new_items = [];\n// Get static data stored with the workflow\n\nconst data = this.getWorkflowStaticData(\"node\");\ndata.ids = data.ids || [];\nfor (let i = items.length - 1; i >= 0; i--) {\n\n// Check if data is already present\n  if (data.ids.includes(items[i].json.ID)) {\n    break;\n  } else {\n\n// if new data then add it to an array\n    new_items.push({\n      json: {\n        id: items[i].json.ID,\n        name: items[i].json.Name,\n        email: items[i].json.Email\n      },\n    });\n  }\n}\ndata.ids = items.map((item) => item.json.ID);\n\n// return new items\nreturn new_items;\n"
      },
      "typeVersion": 1,
      "id": "529de974-e926-4b46-a56f-18eeaa1be74a",
      "notes": "This function node performs automated tasks as part of the workflow."
    },
    {
      "name": "Read data",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        510,
        260
      ],
      "parameters": {
        "options": {...

Output: The JSON is invalid because there is a trailing comma before a closing brace. Remove the extra comma.

Remove the trailing comma before the closing brace.


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

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        810,
        300
      ],
      "parameters": {
        "message": "=You got new feedback with a score of {{$json[\"SentimentScore\"][\"Negative\"]}}. Here is what it says:{{$node[\"Typeform Trigger\"].json[\"What did you think about the event?\"]}}",
        "channelId": "h7cxrd1cefr13x689enzyw7xhc",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "94e8ec7d-fc35-4ac3-a29c-3eea8cfac968",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "name": "NoOp",
      "type": "n8n-nodes-base.noOp",
      "position": [
        800,
        500
      ],
      "parameters": {},
      "typeVersion": 1,
      "id": "90452677-03ac-41f8-90b6-99110ba4505e",
      "notes": "This noOp node performs automated tasks as part of the workflow."
    },
    {
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "position": [
        600,
        400
      ],
      "parameters": {
        "conditions": {
          "number": [],
          "string": [
            {
              "value1": "={{$json[\"Sentiment\"]}}",
              "value2": "NEGATIVE"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "4b2e025e-e03a-4505-a368-3591ada4d0fb",
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "name": "AWS Comprehend",
      "type": "n8n-nodes-base.awsComprehend",
      "position": [
        400,
        400
      ],
      "parameters": {
        "text": "={{$json[\"What did you think about the event?\"]}}",
        "operation": "detectSentiment"
      },
      "credentials": {
        "aws": "AWS Comprehend Credentials"
      },
      "typeVersion": 1,
      "id": "c53aae5d-d666-44da-b5dd-d1f5a4ee4db7",
...

Output:
The node 'Typeform Trigger' (type: n8n-nodes-base.typeformTrigger) requires credentials but the 'credentials' configuration is missing.

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "typeformApi": "typeform"
}
```

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

Add credentials configuration to the 'Typeform Trigger' node.


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

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "Lemlist Trigger",
      "type": "n8n-nodes-base.lemlistTrigger",
      "position": [
        410,
        160
      ],
      "webhookId": "e1e29f99-7222-488a-826f-5af50ffe7505",
      "parameters": {
        "event": "emailsReplied",
        "options": {
          "campaignId": "cam_H5pYEryq6mRKBiy5v"
        }
      },
      "typeVersion": 1,
      "id": "4b6fc9f9-fb7d-429b-af60-3a7421f9402c",
      "notes": "This lemlistTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        610,
        160
      ],
      "parameters": {
        "message": "={{$json[\"firstName\"]}} has replied back to your {{$json[\"campaignName\"]}}. Below is the reply:\n> {{$json[\"text\"]}}",
        "channelId": "qx9yo1i9z3bg5qcy5a1oxnh69c",
        "attachments": [],
        "otherOptions": {}
      },
      "credentials": {
        "mattermostApi": "Mattermost Credentials"
      },
      "typeVersion": 1,
      "id": "7f6120aa-9905-4455-98eb-0a8e18f0e999",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-c27f4119",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "connections": {},
  "name": "Lemlisttrigger Workflow",
  "description": "Automated workflow: Lemlisttrigger Workflow. This workflow processes data and performs automated tasks.",
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "retryCount": 3,
    "retryDelay": 1000
  },
  "meta": {
  ...

Output:
The node 'Lemlist Trigger' (type: n8n-nodes-base.lemlistTrigger) requires credentials but the 'credentials' configuration is missing.

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "lemlistApi": "Lemlist API Credentials"
}
```

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

Add credentials configuration to the 'Lemlist Trigger' node.


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

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "Mattermost",
      "type": "n8n-nodes-base.mattermost",
      "position": [
        810,
        300
      ],
      "parameters": {
        "message": "=You got new feedback with a score of {{$json[\"SentimentScore\"][\"Negative\"]}}. Here is what it says:{{$node[\"Typeform Trigger\"].json[\"What did you think about the event?\"]}}",
        "channelId": "h7cxrd1cefr13x689enzyw7xhc",
        "attachments": [],
        "otherOptions": {}
      },
      "typeVersion": 1,
      "id": "6299aca6-a6f9-4edb-9552-d32c79c95d2b",
      "notes": "This mattermost node performs automated tasks as part of the workflow."
    },
    {
      "name": "NoOp",
      "type": "n8n-nodes-base.noOp",
      "position": [
        800,
        500
      ],
      "parameters": {},
      "typeVersion": 1,
      "id": "3279da3c-b927-4523-b10a-3664bbc514bc",
      "notes": "This noOp node performs automated tasks as part of the workflow."
    },
    {
      "name": "If Node",
      "type": "n8n-nodes-base.if",
      "position": [
        600,
        400
      ],
      "parameters": {
        "conditions": {
          "number": [],
          "string": [
            {
              "value1": "={{$json[\"Sentiment\"]}}",
              "value2": "NEGATIVE"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "1ed7495b-955c-4763-8d5e-7082254661d6",
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "name": "AWS Comprehend",
      "type": "n8n-nodes-base.awsComprehend",
      "position": [
        400,
        400
      ],
      "parameters": {
        "text": "={{$json[\"What did you think about the event?\"]}}",
        "operation": "detectSentiment"
      },
      "credentials": {
        "aws": "AWS Comprehend Credentials"
      },
      "typeVersion": 1,
      "id": "66172ca1-6269-4491-a710-4bd1182e68db",
      "notes": "This awsComprehend node performs automated tasks as part of the wo...

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

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "mattermostApi": "Mattermost Credentials"
}
```

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


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

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

Workflow JSON:
{
  "id": "13",
  "name": "Receive updates when a form is submitted in Mautic, and send a confirmation SMS",
  "nodes": [
    {
      "name": "Mautic Trigger",
      "type": "n8n-nodes-base.mauticTrigger",
      "position": [
        510,
        300
      ],
      "webhookId": "9dce2b84-33fe-4816-ae4b-301c208b5384",
      "parameters": {
        "events": [
          "mautic.form_on_submit"
        ]
      },
      "credentials": {
        "mauticApi": "mautic"
      },
      "typeVersion": 1,
      "id": "f934440d-1704-49d7-8bca-40b516718a3b",
      "notes": "This mauticTrigger node performs automated tasks as part of the workflow."
    },
    {
      "name": "Twilio",
      "type": "n8n-nodes-base.twilio",
      "position": [
        710,
        300
      ],
      "parameters": {
        "to": "={{$node[\"Mautic Trigger\"].json[\"mautic.form_on_submit\"][0][\"submission\"][\"results\"][\"phone_number\"]}}",
        "from": "1234",
        "message": "=Hey, {{$node[\"Mautic Trigger\"].json[\"mautic.form_on_submit\"][0][\"submission\"][\"results\"][\"first_name\"]}} \ud83d\udc4b\nThank you for signing up for the Webinar - Getting Started with n8n. The webinar will start at 1800 CEST on 31st October 2020.\nSee you there!"
      },
      "typeVersion": 1,
      "id": "da7b2023-2858-4097-b3bb-def7179ed780",
      "notes": "This twilio node performs automated tasks as part of the workflow."
    },
    {
      "id": "error-49c4f780",
      "name": "Error Handler",
      "type": "n8n-nodes-base.stopAndError",
      "typeVersion": 1,
      "position": [
        1000,
        400
      ],
      "parameters": {
        "message": "Workflow execution error",
        "options": {}
      }
    }
  ],
  "active": false,
  "settings": {
    "executionOrder": "v1",
    "saveManualExecutions": true,
    "callerPolicy": "workflowsFromSameOwner",
    "errorWorkflow": null,
    "timezone": "UTC",
    "executionTimeout": 3600,
    "maxExecutions": 1000,
    "retryOnFail": true,
    "...

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

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

**Solution**: Add the credentials configuration back to the node:
```json
"credentials": {
  "twilioApi": "twilio"
}
```

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

Add credentials configuration to the 'Twilio' node.


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-3969a52e",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.927548",
    "updatedAt": "2025-09-29T07:07:50.927563",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "4da16859-d29b-4eb7-90a4-3904c1bfff68",
      "name": "Create item",
      "type": "n8n-nodes-base.mondayCom",
      "position": [
        620,
        240
      ],
      "parameters": {
        "name": "={{$node[\"On created contact\"].json[\"mautic.lead_post_save_new\"][0][\"contact\"][\"fields\"][\"core\"][\"firstname\"][\"value\"]}} {{$node[\"On created contact\"].json[\"mautic.lead_post_save_new\"][0][\"contact\"][\"fields\"][\"core\"][\"lastname\"][\"value\"]}}",
        "boardId": "3461879764",
        "groupId": "topics",
        "resource": "={{ $json[\"non_existent_field\"] }}",
        "additionalFields": {
          "columnValues": "={\n  \"email\": {\n    \"email\": \"{{$node[\"On created contact\"].json[\"mautic.lead_post_save_new\"][0][\"contact\"][\"fields\"][\"core\"][\"email\"][\"value\"]}}\",\n    \"text\" : \"{{$node[\"On created contact\"].json[\"mautic.lead_post_save_new\"][0][\"contact\"][\"fields\"][\"core\"][\"email\"][\"value\"]}}\"\n  }\n}"
        }
      },
      "credentials": {
        "mondayComApi": {
          "id": "{{ $credentials.mondayComApi.id }}",
          "name": "[UPDATE ME]"
        }
      },
      "typeVersion": 1,
      "notes": "This mondayCom node performs automated tasks as part of the workflow."
    },
    {
      "id": "88655428-439e-4324-8d8f-865625650c7a",
      "name": "On created contact",
      "type": "n8n-nodes-base.mauticTrigger",
      "position": [
        400,
        240
      ],
      "webhookId": "8c80d932-4c37-4ebe-92ad-e456249db2c5",
      "parameters": {
        "events": [
          "mautic.lead_post_save_new"
        ]
      },
      "cr...

Output:
In node 'Create item', the parameter 'resource' contains an expression that references undefined data.

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

**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 'Create item' parameter 'resource'.


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-e4167688",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.917339",
    "updatedAt": "2025-09-29T07:07:50.917358",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Unsubscribe Mautic contacts from automated unsubscribe emails",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "55d6a64b-88e2-4162-a93a-b31ad32b94fd",
      "name": "Gmail Trigger",
      "type": "n8n-nodes-base.gmailTrigger",
      "position": [
        140,
        860
      ],
      "parameters": {
        "filters": {
          "includeSpamTrash": true
        },
        "pollTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        }
      },
      "credentials": {
        "gmailOAuth2": {
          "id": "{{ $credentials.gmailOAuth2.id }}",
          "name": "Gmail account"
        }
      },
      "typeVersion": 1,
      "notes": "This gmailTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "a697b58c-e0c8-42e0-8211-49caf46ce222",
      "name": "Is automated unsubscribe?",
      "type": "n8n-nodes-base.if",
      "position": [
        460,
        1000
      ],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "= {{ $json[\"To\"] }}",
              "value2": "unsubscribe",
              "operation": "contains"
            },
            {
              "value1": "={{ $json[\"From\"] }}",
              "value2": "={{ $node[\"Edit Fields\"].json[\"emailAddress\"] }}",
              "operation": "notEqual"
            }
          ]
        }
      },
      "typeVersion": 1,
      "alwaysOutputData": false,
      "notes": "This if node performs automated tasks as part of the workflow."
    },...

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: 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": [
    {
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "position": [
        -550,
        450
      ],
      "parameters": {
        "path": "PuHq2RQsmc3HXB/hook",
        "options": {
          "rawBody": false
        },
        "httpMethod": "POST"
      },
      "typeVersion": 1,
      "id": "node-ac41d08e"
    },
    {
      "name": "Mautic",
      "type": "n8n-nodes-base.mautic",
      "position": [
        1260,
        180
      ],
      "parameters": {
        "email": "={{$node[\"@MAIN STUDENT DATA\"].json[\"student\"][\"email\"]}}",
        "company": 1,
        "options": {},
        "lastName": "={{$node[\"@MAIN STUDENT DATA\"].json[\"student\"][\"lastName\"]}}",
        "firstName": "={{$node[\"@MAIN STUDENT DATA\"].json[\"student\"][\"firstName\"]}}",
        "authentication": "{{ $credentials.oAuth2 }}",
        "additionalFields": {}
      },
      "credentials": {
        "mauticOAuth2Api": "OAuth2 Mautic"
      },
      "typeVersion": 1,
      "alwaysOutputData": false,
      "id": "node-a642a0cf"
    },
    {
      "name": "Find User",
      "type": "n8n-nodes-base.mautic",
      "position": [
        170,
        260
      ],
      "parameters": {
        "limit": 1,
        "options": {
          "search": "={{$node[\"Set Webhook Request\"].json[\"student\"][\"email\"]}}"
        },
        "operation": "getAll",
        "authentication": "{{ $credentials.oAuth2 }}"
      },
      "credentials": {
        "mauticOAuth2Api": "OAuth2 Mautic"
      },
      "notesInFlow": false,
      "typeVersion": 1,
      "alwaysOutputData": false,
      "id": "node-8f9bd912"
    },
    {
      "name": "Update User",
      "type": "n8n-nodes-base.mautic",
      "position": [
        1560,
        250
      ],
      "parameters": {
        "options": {},
        "contactId": "={{$node[\"@MAIN STUDENT DATA\"].json[\"userFound\"]}}",
        "operation": "update",
        "updateFields": {
          "email": "={{$node[\"@MAIN ...

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

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

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

**Solutions**:

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

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

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

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

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


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

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

Workflow JSON:
{
  "nodes": [
    {
      "name": "GS Read Data2 1",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        240,
        750
      ],
      "parameters": {
        "range": "Data!A:P",
        "options": {
          "valueRenderMode": "FORMATTED_VALUE"
        },
        "sheetId": "1jKYwPE9DMFOYf1AeDuTvQ3GSM2GqaEJhGYNoisxSLpM"
      },
      "credentials": {
        "googleApi": "n8n API"
      },
      "typeVersion": 1,
      "id": "e42e361a-19e8-4118-96ce-d66a3589e260",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "name": "Mautic",
      "type": "n8n-nodes-base.mautic",
      "position": [
        450,
        750
      ],
      "parameters": {
        "email": "={{$node[\"GS Read Data2\"].json[\"email\"]}}",
        "options": {},
        "firstName": "={{$node[\"GS Read Data2\"].json[\"firstname\"]}}",
        "additionalFields": {
          "mobile": "={{$node[\"GS Read Data2\"].json[\"mobile\"]}}"
        },
        "_injected_number_field": "not_a_number"
      },
      "credentials": {
        "mauticApi": "MauticAPI"
      },
      "notesInFlow": false,
      "typeVersion": 1,
      "id": "53b91521-ff0e-475a-a7bc-1e9e34771095",
      "notes": "This mautic node performs automated tasks as part of the workflow."
    },
    {
      "name": "GS Read Data2 2",
      "type": "n8n-nodes-base.googleSheets",
      "position": [
        240,
        750
      ],
      "parameters": {
        "range": "Data!A:P",
        "options": {
          "valueRenderMode": "FORMATTED_VALUE"
        },
        "sheetId": "1jKYwPE9DMFOYf1AeDuTvQ3GSM2GqaEJhGYNoisxSLpM"
      },
      "credentials": {
        "googleApi": "n8n API"
      },
      "typeVersion": 1,
      "id": "c0364ef3-7c36-4dc1-8419-dce56fa43f70",
      "notes": "This googleSheets node performs automated tasks as part of the workflow."
    },
    {
      "name": "Cron",
      "type": "n8n-nodes-base.cron",
      "position": [
      ...

Output:
The node 'Mautic' 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: 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:
{
  "id": 83,
  "name": "New WooCommerce Customer to Mautic",
  "nodes": [
    {
      "name": "Check for Existing",
      "type": "n8n-nodes-base.mautic",
      "position": [
        280,
        480
      ],
      "parameters": {
        "options": {
          "search": "={{$json[\"email\"]}}"
        },
        "operation": "getAll",
        "authentication": "{{ $credentials.oAuth2 }}"
      },
      "credentials": {
        "mauticOAuth2Api": {
          "id": "{{ $credentials.mauticOAuth2Api.id }}",
          "name": "Mautic account"
        }
      },
      "typeVersion": 1,
      "alwaysOutputData": true,
      "id": "aaa4d55f-1f51-43f1-a083-8267a0b6bf58",
      "notes": "This mautic node performs automated tasks as part of the workflow."
    },
    {
      "name": "If New",
      "type": "n8n-nodes-base.if",
      "position": [
        460,
        480
      ],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "={{$json[\"id\"]}}",
              "operation": "isEmpty"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "7fc2998a-28b9-485c-855b-c0805a5ca5b9",
      "notes": "This if node performs automated tasks as part of the workflow."
    },
    {
      "name": "Create Contact",
      "type": "n8n-nodes-base.mautic",
      "position": [
        680,
        320
      ],
      "parameters": {
        "email": "={{$node[\"Customer Created\"].json[\"email\"]}}",
        "company": "={{$node[\"Customer Created\"].json[\"billing\"][\"company\"]}}",
        "options": {},
        "lastName": "={{$node[\"Customer Created\"].json[\"last_name\"]}}",
        "firstName": "={{$node[\"Customer Created\"].json[\"first_name\"]}}",
        "authentication": "{{ $credentials.oAuth2 }}",
        "additionalFields": {}
      },
      "credentials": {
        "mauticOAuth2Api": {
          "id": "{{ $credentials.mauticOAuth2Api.id }}",
          "name": "Mautic account"
        }
      },
 ...

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

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

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

**Solutions**:

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

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

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

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

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


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

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

Workflow JSON:
{
  "id": 86,
  "name": "Check for valid Mautic contact email",
  "nodes": [
    {
      "name": "If is not new contact",
      "type": "n8n-nodes-base.if",
      "position": [
        780,
        460
      ],
      "parameters": {
        "conditions": {
          "string": [
            {
              "value1": "={{$json[\"mautic.lead_post_save_new\"]}}",
              "operation": "isEmpty"
            }
          ]
        }
      },
      "typeVersion": 1,
      "id": "node-043eeaca"
    },
    {
      "name": "On Contact Identified",
      "type": "n8n-nodes-base.mauticTrigger",
      "position": [
        600,
        460
      ],
      "webhookId": "a3ee0f93-2870-44e2-bb2f-0175433263b3",
      "parameters": {
        "events": [
          "mautic.lead_post_save_new"
        ],
        "authentication": "{{ $credentials.oAuth2 }}"
      },
      "credentials": {
        "mauticOAuth2Api": {
          "id": "{{ $credentials.mauticOAuth2Api.id }}",
          "name": "Mautic account"
        }
      },
      "typeVersion": 1,
      "id": "node-81143f3f"
    },
    {
      "name": "extract information",
      "type": "n8n-nodes-base.itemLists",
      "position": [
        980,
        480
      ],
      "parameters": {
        "options": {},
        "fieldToSplitOut": "mautic.lead_post_save_new"
      },
      "typeVersion": 1,
      "id": "node-ce3546ad"
    },
    {
      "name": "validate email",
      "type": "n8n-nodes-base.oneSimpleApi",
      "position": [
        1180,
        480
      ],
      "parameters": {
        "resource": "utility",
        "emailAddress": "={{$json[\"lead\"][\"fields\"][\"core\"][\"email\"][\"value\"]}}"
      },
      "credentials": {
        "oneSimpleApi": {
          "id": "{{ $credentials.oneSimpleApi.id }}",
          "name": "One Simple account"
        }
      },
      "typeVersion": 1,
      "id": "node-db988646"
    },
    {
      "name": "If the email is suspicious",
      "type": "n8n-nodes-base.if",
      "notes":...

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:
{
  "id": "JiSesGjDIXIPYtbt",
  "meta": {
    "instanceId": "workflow-d6b546f1",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.946733",
    "updatedAt": "2025-09-29T07:07:50.946740",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Shopify + Mautic",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "592b2608-e77e-4988-8f77-8820645b56ee",
      "name": "Shopify Trigger",
      "type": "n8n-nodes-base.shopifyTrigger",
      "position": [
        540,
        320
      ],
      "webhookId": "252052f3-e844-4500-8c34-c57f583d4432",
      "parameters": {
        "topic": "customers/update",
        "authentication": "{{ $credentials.accessToken }}"
      },
      "credentials": {
        "shopifyAccessTokenApi": {
          "id": "WbxXaLMHozAgY3Rz",
          "name": "Shopify Access Token account"
        }
      },
      "typeVersion": 1,
      "notes": "This shopifyTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "f2e6931d-0279-4142-9b9e-1092657d91e2",
      "name": "Accepts Marketing?",
      "type": "n8n-nodes-base.if",
      "position": [
        1240,
        180
      ],
      "parameters": {
        "options": {},
        "conditions": {
          "options": {
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
          },
          "combinator": "and",
          "conditions": [
            {
              "id": "8e207eec-212a-48a9-b64e-2d15094c987f",
              "operator": {
                "name": "filter.operator.equals",
                "type": "string",
                "operation": "equals"
              },
              "leftValue": "={{ $('Shopify Trigger').item.json.email_marketing_consent.state }}",
              "rightValue": "subscribed"...

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:
{
  "meta": {
    "instanceId": "workflow-b08beffc",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.944856",
    "updatedAt": "2025-09-29T07:07:50.944865",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "05bd643c-6dd0-4f36-a586-3a06cc26893c",
      "name": "Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        200,
        780
      ],
      "parameters": {
        "width": 476.4578377639565,
        "height": 299.6468819708682,
        "content": "## Working with Excel files\n1. Load the spreadsheet file into the workflow (.xls, .xlsx, .csv).\n2. Convert the file with **Spreadsheet File** node. This allows other nodes to access the data.\n3. Transform and manipulate the spreadsheet data as needed\n4. [Optional] Convert back to a spreadsheet file\n5. [Optional] Save file locally or upload to a server\n\n\n\n\u2139\ufe0f This template shows how to work with spreadsheet files themselves. Use the **Microsoft Excel 365** node to interact with the Microsoft Office 365 cloud platform. "
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "84db705b-b45f-447f-b3e6-ac9650816e3b",
      "name": "Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        840,
        800
      ],
      "parameters": {
        "width": 261.5285597588645,
        "height": 244.71805702217537,
        "content": "### 1A. From a public URL"
      },
      "typeVersion": 1,
      "notes": "This stickyNote node performs automated tasks as part of the workflow."
    },
    {
      "id": "92b8375b-92a3-41ca-874e-d9c4567e21d4",
      "name": "Read Binary File",
      "type": "n8n-nodes-base.readBinaryFile",
      "notes": "Fetches a local file",
      "disabled": true,
      "position": [
        920,
     ...

Output: The JSON is invalid because there is a trailing comma before a closing brace. Remove the extra comma.


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-87b13df4",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.947796",
    "updatedAt": "2025-09-29T07:07:50.947811",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "nodes": [
    {
      "id": "59b786fe-8e45-4616-aa45-9748df144c3a",
      "name": "MySQL",
      "type": "n8n-nodes-base.mySql",
      "position": [
        -80,
        220
      ],
      "parameters": {
        "query": "SELECT \n    company,\n    cost_center AS default_cost_center,\n    COUNT(*) AS project_count\nFROM \n    tabProject\nWHERE \n    status = 'Open' \n    AND project_type = 'External'\n    AND is_active = 'Yes'\n    AND budgeted_project_cost = 0\n    \nGROUP BY \n    company, cost_center\nORDER BY \n    company, project_count DESC;\n",
        "options": {},
        "operation": "executeQuery"
      },
      "typeVersion": 2.4,
      "notes": "This mySql node performs automated tasks as part of the workflow."
    },
    {
      "id": "48c20822-9f2e-4108-8bfb-b300689a9724",
      "name": "Schedule Trigger",
      "type": "n8n-nodes-base.scheduleTrigger",
      "position": [
        -360,
        220
      ],
      "parameters": {
        "rule": {
          "interval": [
            {
              "field": "weeks",
              "triggerAtHour": 8
            }
          ]
        }
      },
      "typeVersion": 1.2,
      "notes": "This scheduleTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "3757860b-b7a0-4617-a398-37ac42f1acea",
      "name": "Switch",
      "type": "n8n-nodes-base.switch",
      "position": [
        180,
        200
      ],
      "parameters": {
        "rules": {
          "values": [
            {
              "outputKey": "YOUR_CREDENTIAL_HERE",
              "conditions": {
                "options": {
                  "version": 2,
                ...

Output: The JSON is invalid because there is a trailing comma before a closing brace. Remove the extra comma.


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": "0HVA2TOmkdNpH5DP",
  "meta": {
    "instanceId": "workflow-ae712b79",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.970575",
    "updatedAt": "2025-09-29T07:07:50.970595",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Google calendar to Outlook",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "e7e75d4a-ee5a-4ee7-b69d-71d8eb51fe55",
      "name": "Merge",
      "type": "n8n-nodes-base.merge",
      "position": [
        920,
        800
      ],
      "parameters": {
        "mode": "combine",
        "options": {},
        "combineBy": "combineAll"
      },
      "typeVersion": 3,
      "notes": "This merge node performs automated tasks as part of the workflow."
    },
    {
      "id": "6e159340-910c-4c1e-9e6b-c6ef679309be",
      "name": "Incoming Event Trigger",
      "type": "n8n-nodes-base.googleCalendarTrigger",
      "position": [
        500,
        360
      ],
      "parameters": {
        "options": {},
        "pollTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        },
        "triggerOn": "eventCreated",
        "calendarId": {
          "__rl": true,
          "mode": "list",
          "value": "your_email@gmail.com",
          "cachedResultName": "Your Name"
        }
      },
      "credentials": {
        "googleCalendarOAuth2Api": {
          "id": "IgBZqXCtaacRpIKt",
          "name": "Your Name Google Calendar account"
        }
      },
      "typeVersion": 1,
      "notes": "This googleCalendarTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "7ffb13c3-7d16-4bd8-aed0-7f6378394a1c",
      "name": "Cancel Event Trigger",
      "type": "n8n-nodes-base.googleCalendarTrigger",
      "position": [
        280,
 ...

Output:
The workflow has a broken data flow. The node '6e159340-910c-4c1e-9e6b-c6ef679309be' is not connected to any subsequent nodes.

**Root Cause**: The connections object is missing the output connections for '6e159340-910c-4c1e-9e6b-c6ef679309be'.

**Impact**: Data from '6e159340-910c-4c1e-9e6b-c6ef679309be' 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 '6e159340-910c-4c1e-9e6b-c6ef679309be' 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": {
  "6e159340-910c-4c1e-9e6b-c6ef679309be": {
    "main": [[{"node": "NextNode", "type": "main", "index": 0}]]
  }
}
```

Reconnect '6e159340-910c-4c1e-9e6b-c6ef679309be' to the workflow.


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

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

Workflow JSON:
{
  "id": "mqindLlOy0A0e5aA:
  "meta": {
    "instanceId": "workflow-e04b9c37",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.959208",
    "updatedAt": "2025-09-29T07:07:50.959216",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "Outlook",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "b2e6066f-a4c7-486c-aa0d-06a4c92aa745",
      "name": "Connect Outlook & Set Filter",
      "type": "n8n-nodes-base.microsoftOutlookTrigger",
      "position": [
        -240,
        -260
      ],
      "parameters": {
        "output": "raw",
        "filters": {
          "sender": "sales@yourcompany.com"
        },
        "options": {},
        "pollTimes": {
          "item": [
            {
              "mode": "everyMinute"
            }
          ]
        }
      },
      "credentials": {
        "microsoftOutlookOAuth2Api": {
          "id": "nRYwUzhHrSBFtcSS",
          "name": "Microsoft Outlook account 2"
        }
      },
      "typeVersion": 1,
      "notes": "This microsoftOutlookTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "98f20649-4842-44b8-86c3-a153cd7f4ce2",
      "name": "Add OpenAI Chat Model",
      "type": "n8n-nodes-base.noOp",
      "position": [
        140,
        100
      ],
      "parameters": {
        "model": {
          "__rl": true,
          "mode": "list",
          "value": "gpt-4o-mini"
        },
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "id": "sXujPvtyB7ZEzKZs",
          "name": "OpenAi account 2"
        }
      },
      "typeVersion": 1.2,
      "notes": "This lmChatOpenAi node performs automated tasks as part of the workflow."
    },
    {
      "id": "bf4cb647-91c6-4f3d-a685-ed928b431ef5",
      "name": "Add AI Agent Ins...

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: 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": "okMME97B70fXzK5U",
  "meta": {
    "instanceId": "workflow-c5b36195",
    "versionId": "1.0.0",
    "createdAt": "2025-09-29T07:07:50.958823",
    "updatedAt": "2025-09-29T07:07:50.958836",
    "owner": "n8n-user",
    "license": "MIT",
    "category": "automation",
    "status": "active",
    "priority": "high",
    "environment": "production"
  },
  "name": "send file to kindle through telegram bot",
  "tags": [
    "automation",
    "n8n",
    "production-ready",
    "excellent",
    "optimized"
  ],
  "nodes": [
    {
      "id": "6e581437-28dc-4573-88f2-ce44ec497819",
      "name": "receive file message from telegram bot",
      "type": "n8n-nodes-base.telegramTrigger",
      "position": [
        460,
        520
      ],
      "webhookId": "5d8d9b97-672d-461a-83c5-1665136494dd",
      "parameters": {
        "updates": [
          "message"
        ],
        "additionalFields": {
          "download": true
        }
      },
      "typeVersion": 1.1,
      "notes": "This telegramTrigger node performs automated tasks as part of the workflow."
    },
    {
      "id": "6eb48c62-69a9-4bd2-a6ab-cffb5cde03df",
      "name": "check if there is a file in the message",
      "type": "n8n-nodes-base.if",
      "position": [
        680,
        520
      ],
      "parameters": {
        "options": {
          "ignoreCase": false
        },
        "conditions": {
          "options": {
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
          },
          "combinator": "and",
          "conditions": [
            {
              "id": "4ad69b1f-c19f-436d-8af3-203722f4dd4c",
              "operator": {
                "type": "object",
                "operation": "exists",
                "singleValue": true
              },
              "leftValue": "={{ $json.message.document }}",
              "rightValue": ""
            }
          ]
        }
      },
      "typeVersion": 2,
      "alwaysOutputD...

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'.