TAKUTO ISHIKAWA This workflow corresponds to n8n.io template #13932 — we link there as the canonical source.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"id": "S7oD6M9jeI4crXTE",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "Mechanical Design Change Approval Workflow",
"tags": [],
"nodes": [
{
"id": "df5d467f-a92d-4bb7-82c3-50fe15665dd5",
"name": "Webhook - Receive Drawing Change Request",
"type": "n8n-nodes-base.webhook",
"position": [
-208,
0
],
"parameters": {
"path": "drawing-change-request",
"options": {},
"httpMethod": "POST",
"responseMode": "responseNode"
},
"typeVersion": 2.1
},
{
"id": "7d142bd4-d69d-43ef-9384-b1630b8faecb",
"name": "IF - Validate Required Fields",
"type": "n8n-nodes-base.if",
"position": [
48,
0
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 3,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "loose"
},
"combinator": "or",
"conditions": [
{
"id": "551f4c78-14de-489c-a042-ba581b3c3675",
"operator": {
"type": "string",
"operation": "empty",
"singleValue": true
},
"leftValue": "={{$json.body[\"drawing_no\"]}}",
"rightValue": ""
},
{
"id": "49c27d9e-2d59-4f90-aef5-d67c8b8cf4ef",
"operator": {
"type": "string",
"operation": "empty",
"singleValue": true
},
"leftValue": "={{$json.body[\"change_reason\"]}}",
"rightValue": ""
},
{
"id": "6c07ec3b-30ad-4dcf-8be4-5ce9d4396937",
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{$json.body[\"change_reason\"].length}}",
"rightValue": "0"
}
]
},
"looseTypeValidation": true
},
"typeVersion": 2.3
},
{
"id": "61fa5e4c-35d1-4593-bfbc-14267c572564",
"name": "Switch - Determine Approver by Impact",
"type": "n8n-nodes-base.switch",
"position": [
896,
64
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"version": 3,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "4cfc044f-bbf0-4eb7-8880-5b315e09c182",
"operator": {
"type": "string",
"operation": "contains"
},
"leftValue": "={{$json.body[\"change_reason\"]}}",
"rightValue": "Text"
}
]
}
},
{
"conditions": {
"options": {
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"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "ede4491e-c27a-413d-9882-936c9e8bbdb2",
"operator": {
"type": "string",
"operation": "contains"
},
"leftValue": "={{$json.body[\"change_reason\"]}}",
"rightValue": "Dimension"
}
]
}
},
{
"conditions": {
"options": {
"version": 3,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "b2ad2872-6403-43e8-89e6-dba13cc91d02",
"operator": {
"type": "string",
"operation": "contains"
},
"leftValue": "={{$json.body[\"change_reason\"]}}",
"rightValue": "Material"
}
]
}
}
]
},
"options": {
"fallbackOutput": "extra"
}
},
"typeVersion": 3.4
},
{
"id": "dd868a0c-325c-48b4-89e5-d7e5f9c94407",
"name": "Set Low",
"type": "n8n-nodes-base.set",
"position": [
1152,
-224
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "d22a6366-6f87-4051-b0a5-d4362f5a8b15",
"name": "impact_level",
"type": "string",
"value": "Low"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "ed7001d2-e187-4ffd-b1ac-544ce52a9131",
"name": "Set High",
"type": "n8n-nodes-base.set",
"position": [
1152,
128
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "7f881411-2d27-4fc2-8336-2121f24a2a15",
"name": "impact_level",
"type": "string",
"value": "High"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "3e15a561-ef6f-40b1-83ff-a61a6e176cc2",
"name": "Set Medium",
"type": "n8n-nodes-base.set",
"position": [
1152,
-32
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "c0c06460-8771-4f9e-90c2-38bbba6954bc",
"name": "impact_level",
"type": "string",
"value": "Medium"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "0384c030-560b-4f1c-a2a8-881145d88245",
"name": "Set Medium (Fallback)",
"type": "n8n-nodes-base.set",
"position": [
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],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "d85a6aa7-ecaa-49ad-a7c5-352f03ad62a4",
"name": "impact_level",
"type": "string",
"value": "Medium"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "9413b3e4-1858-4fc3-836d-880ac1de6dae",
"name": "Notify Slack (Approval Request)",
"type": "n8n-nodes-base.slack",
"position": [
1680,
80
],
"parameters": {
"text": "=\ud83d\ude80 *New ECR Approval Request*\n\n*ID:* {{ $json.ecr_id }}\n*Reason:* {{ $json.body.change_reason }}\n*Impact:* {{ $json.impact_level }}\n\n\ud83d\udc47 *Action Required:*\n{{ $execution.resumeFormUrl }}",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "id",
"value": "=Enter your channel ID"
},
"otherOptions": {},
"authentication": "oAuth2"
},
"credentials": {
"slackOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 2.4
},
{
"id": "3aaa7b82-9ae8-4f5b-bdeb-4b77ad2ac439",
"name": "Wait (Form)",
"type": "n8n-nodes-base.wait",
"position": [
1872,
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],
"parameters": {
"resume": "form",
"options": {},
"formTitle": "Engineering Change Request (ECR) Approval",
"formFields": {
"values": [
{
"fieldType": "dropdown",
"fieldLabel": "decision",
"fieldOptions": {
"values": [
{
"option": "approve"
},
{
"option": "reject"
}
]
}
},
{
"fieldType": "textarea",
"fieldLabel": "comment"
}
]
},
"formDescription": "Please review the details and provide your decision."
},
"typeVersion": 1.1
},
{
"id": "aca62028-ec94-4a5b-b196-66c5ed95842f",
"name": "Notify Approval (Slack)",
"type": "n8n-nodes-base.slack",
"position": [
2288,
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],
"parameters": {
"text": "\u2705 ECR Approved. Proceeding to ECO issuance.",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "id",
"value": "=Enter your channel ID"
},
"otherOptions": {},
"authentication": "oAuth2"
},
"credentials": {
"slackOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 2.4
},
{
"id": "c48e5ef0-4ba5-49f5-a7d0-863903844a36",
"name": "Notify Rejection (Slack)",
"type": "n8n-nodes-base.slack",
"position": [
2288,
176
],
"parameters": {
"text": "=\u274c ECR Rejected. Please review and resubmit.",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "id",
"value": "=Enter your channel ID"
},
"otherOptions": {},
"authentication": "oAuth2"
},
"credentials": {
"slackOAuth2Api": {
"name": "<your credential>"
}
},
"typeVersion": 2.4
},
{
"id": "77b995f1-0376-4e8f-8924-f4c929ad11f1",
"name": "Return Response (Error)",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
336,
-128
],
"parameters": {
"options": {
"responseCode": 400
},
"respondWith": "json",
"responseBody": "{\"error\": \"drawing_no and change_reason are required fields.\"}"
},
"typeVersion": 1.5
},
{
"id": "0c61661d-570e-4cf6-96e3-dc212865eaaf",
"name": "Generate ECR Metadata (Set Node)",
"type": "n8n-nodes-base.set",
"position": [
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],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "1160a04b-76b7-4d7c-8cc0-745c3dcda5b3",
"name": "ecr_id",
"type": "string",
"value": "=ECR-{{ $now.format('yyyyMMdd-HHmm') }}"
},
{
"id": "dadf308e-a811-41c5-a066-16067e9d9c0d",
"name": "token",
"type": "string",
"value": "={{ $json.data }}"
},
{
"id": "fcc9fc2f-8a56-49a2-b3f7-ca36f720aeb3",
"name": "status",
"type": "string",
"value": "Pending"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "c1a765da-51c5-4068-b406-a1f90aae42a1",
"name": "Return Success (Respond to Webhook)",
"type": "n8n-nodes-base.respondToWebhook",
"position": [
1472,
80
],
"parameters": {
"options": {},
"respondWith": "json",
"responseBody": "={\n \"message\": \"Request received. Approval process started.\",\n \"id\": \"{{ $json.ecr_id }}\",\n \"token\": \"{{ $json.token }}\",\n \"change_reason\": \"{{ $json.body.change_reason }}\",\n \"drawing_no\": \"{{ $json.body.drawing_no }}\",\n \"impact_level\": \"{{ $json.impact_level }}\"\n}\n"
},
"typeVersion": 1.5
},
{
"id": "0dc81c06-623d-4123-ac0c-ee4bde72ca62",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1200,
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],
"parameters": {
"width": 3760,
"height": 1344,
"content": "## \u2699\ufe0f Manage Engineering Change Requests (ECR) via Slack\n\n## \ud83d\udccb Overview\nStreamline your engineering change management process by integrating generic webhooks with Slack interactive approvals. This workflow receives a generic design change request, categorizes its impact level, and routes it to a Slack channel for approval.\n\nThis template is ideal for **Mechanical Engineering teams**, **Manufacturing**, and **Project Managers** who need to track drawing changes (ECR/ECO) without complex PLM software.\n\n## \ud83d\ude80 How it works\n1. **Receive Request:** Catches a POST webhook containing `drawing_no` and `change_reason`.\n2. **Validation & Logic:** Ensures data integrity and determines the \"Impact Level\" (High, Medium, Low) based on keywords in the reason (e.g., \"Dimension\" triggers specific logic).\n3. **Notification:** Sends a formatted message to a designated Slack channel with a link to an approval form.\n4. **Human in the Loop:** The workflow waits (pauses) until a reviewer approves or rejects the request via the n8n form.\n5. **Final Notification:** Posts the final decision back to Slack.\n\n## \ud83d\udee0\ufe0f Setup Steps\n1. **Configure Webhook:** Use the production URL of the Webhook node in your upstream application (e.g., Google Forms, internal tools, or Typeform).\n2. **Connect Slack:** Select your Slack credential and choose the channel where approval requests should be sent in the **Notify Slack** nodes.\n3. **Customize Logic:** Open the **Switch** node to adjust the keywords (e.g., \"Material\", \"Dimension\") that determine the impact level according to your company's policy.\n\n## \ud83d\udca1 Requirements\n- n8n (Self-hosted or Cloud)\n- Slack account and a channel for notifications"
},
"typeVersion": 1
},
{
"id": "6c2fb377-08f3-4ff9-8cfb-6fd66a138fc5",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-256,
-144
],
"parameters": {
"color": 7,
"width": 752,
"height": 336,
"content": "Validate Incoming Request"
},
"typeVersion": 1
},
{
"id": "e491d0d3-7b26-476b-8d95-1eb8ba2456de",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
832,
-272
],
"parameters": {
"color": 7,
"width": 576,
"height": 768,
"content": "Determine Impact Level & Assign Metadata"
},
"typeVersion": 1
},
{
"id": "a4398b0b-950b-4f75-99d3-b1d6ee744587",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
1632,
-32
],
"parameters": {
"color": 7,
"width": 416,
"height": 368,
"content": " Notify & Wait for Human Approval"
},
"typeVersion": 1
},
{
"id": "f6be5eb3-b3f6-4a49-b67a-1f658b069406",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
2048,
-32
],
"parameters": {
"color": 7,
"width": 416,
"height": 368,
"content": " Process Decision"
},
"typeVersion": 1
},
{
"id": "0a650e48-3500-4541-9378-47e66a37b38d",
"name": "Check Decision",
"type": "n8n-nodes-base.switch",
"position": [
2080,
80
],
"parameters": {
"rules": {
"values": [
{
"conditions": {
"options": {
"version": 3,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "2e61dd0e-b34a-4f02-991e-6a7dec82599e",
"operator": {
"type": "string",
"operation": "equals"
},
"leftValue": "={{ $json.decision }}",
"rightValue": "approve"
}
]
}
},
{
"conditions": {
"options": {
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"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
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"operator": {
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"operation": "equals"
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"leftValue": "={{ $json.decision }}",
"rightValue": "reject"
}
]
}
}
]
},
"options": {}
},
"typeVersion": 3.4
},
{
"id": "cd65a39e-d449-4f2c-ba21-88b5901521db",
"name": "Generate Secure Token",
"type": "n8n-nodes-base.crypto",
"position": [
512,
96
],
"parameters": {
"action": "generate",
"encodingType": "hex"
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "9ed4ac16-c745-48fb-8a58-d7234c9f671c",
"connections": {
"Set Low": {
"main": [
[
{
"node": "Return Success (Respond to Webhook)",
"type": "main",
"index": 0
}
]
]
},
"Set High": {
"main": [
[
{
"node": "Return Success (Respond to Webhook)",
"type": "main",
"index": 0
}
]
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},
"Set Medium": {
"main": [
[
{
"node": "Return Success (Respond to Webhook)",
"type": "main",
"index": 0
}
]
]
},
"Wait (Form)": {
"main": [
[
{
"node": "Check Decision",
"type": "main",
"index": 0
}
]
]
},
"Check Decision": {
"main": [
[
{
"node": "Notify Approval (Slack)",
"type": "main",
"index": 0
}
],
[
{
"node": "Notify Rejection (Slack)",
"type": "main",
"index": 0
}
]
]
},
"Generate Secure Token": {
"main": [
[
{
"node": "Generate ECR Metadata (Set Node)",
"type": "main",
"index": 0
}
]
]
},
"Set Medium (Fallback)": {
"main": [
[
{
"node": "Return Success (Respond to Webhook)",
"type": "main",
"index": 0
}
]
]
},
"IF - Validate Required Fields": {
"main": [
[
{
"node": "Return Response (Error)",
"type": "main",
"index": 0
}
],
[
{
"node": "Generate Secure Token",
"type": "main",
"index": 0
}
]
]
},
"Notify Slack (Approval Request)": {
"main": [
[
{
"node": "Wait (Form)",
"type": "main",
"index": 0
}
]
]
},
"Generate ECR Metadata (Set Node)": {
"main": [
[
{
"node": "Switch - Determine Approver by Impact",
"type": "main",
"index": 0
}
]
]
},
"Return Success (Respond to Webhook)": {
"main": [
[
{
"node": "Notify Slack (Approval Request)",
"type": "main",
"index": 0
}
]
]
},
"Switch - Determine Approver by Impact": {
"main": [
[
{
"node": "Set Low",
"type": "main",
"index": 0
}
],
[
{
"node": "Set Medium",
"type": "main",
"index": 0
}
],
[
{
"node": "Set High",
"type": "main",
"index": 0
}
],
[
{
"node": "Set Medium (Fallback)",
"type": "main",
"index": 0
}
]
]
},
"Webhook - Receive Drawing Change Request": {
"main": [
[
{
"node": "IF - Validate Required Fields",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
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slackOAuth2Api
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About this workflow
Streamline your engineering change management process by integrating generic webhooks with Slack interactive approvals. This workflow receives a generic design change request, categorizes its impact level, and routes it to a Slack channel for approval.
Source: https://n8n.io/workflows/13932/ — original creator credit. Request a take-down →
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