starter.json

{
  "name": "04 - Safe Divide API (starter)",
  "nodes": [
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "divide",
        "responseMode": "responseNode",
        "options": {}
      },
      "id": "m04-webhook",
      "name": "Divide API",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        0,
        100
      ],
      "webhookId": "course-04-divide"
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "n1",
              "leftValue": "={{ $json.body.a !== '' && $json.body.b !== '' && Number.isFinite(Number($json.body.a)) && Number.isFinite(Number($json.body.b)) }}",
              "rightValue": "",
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "id": "m04-valid",
      "name": "Numbers?",
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        220,
        100
      ]
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ { error: 'a and b must be numbers' } }}",
        "options": {
          "responseCode": 400
        }
      },
      "id": "m04-400",
      "name": "Respond Bad Input",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "position": [
        440,
        250
      ]
    },
    {
      "parameters": {
        "content": "## Your task\n1. Build a sub-workflow **04 - Divide (sub-workflow)**: inputs `a`, `b` (numbers). If `b == 0` → Stop and Error, else return `result`. **Publish it.**\n2. Here: call it with **Execute Workflow** from the IF's true output.\n3. On that node: Settings → On Error → *Continue (using error output)*. Respond 200 with the result, or 422 with the error.\n4. Build **04 - Error Logger** (Error Trigger → format alert), publish it, and select it in this workflow's Settings → Error Workflow.\n\nTest: `./test/test.sh`",
        "height": 260,
        "width": 420
      },
      "id": "starter-task-note",
      "name": "Your Task",
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        0,
        -340
      ]
    }
  ],
  "connections": {
    "Divide API": {
      "main": [
        [
          {
            "node": "Numbers?",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Numbers?": {
      "main": [
        [],
        [
          {
            "node": "Respond Bad Input",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "pinData": {},
  "settings": {
    "executionOrder": "v1",
    "errorWorkflow": "__WF_ID:learner-error.json__"
  }
}