{ "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": { "version": 3, "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": [ 1152, 320 ], "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": "" } }, "typeVersion": 2.4 }, { "id": "3aaa7b82-9ae8-4f5b-bdeb-4b77ad2ac439", "name": "Wait (Form)", "type": "n8n-nodes-base.wait", "position": [ 1872, 80 ], "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, -16 ], "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": "" } }, "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": "" } }, "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": [ 704, 96 ], "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, -704 ], "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": { "version": 3, "leftValue": "", "caseSensitive": true, "typeValidation": "strict" }, "combinator": "and", "conditions": [ { "id": "3c40e6af-6b31-4b1d-980f-56ae9d2ea5a1", "operator": { "type": "string", "operation": "equals" }, "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 } ] ] }, "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 } ] ] } } }