Workflow: LangChain - Example - Code Node Example
Integrations: manualTrigger, noOp, set, stickyNote, stopAndError

{"id": "q2MJWAqpKF2BCJkq", "meta": {"instanceId": "workflow-08df9c09", "versionId": "1.0.0", "createdAt": "2025-09-29T07:07:49.908871", "updatedAt": "2025-09-29T07:07:49.908881", "owner": "n8n-user", "license": "MIT", "category": "automation", "status": "active", "priority": "high", "environment": "production"}, "name": "LangChain - Example - Code Node Example", "tags": ["automation", "n8n", "production-ready", "excellent", "optimized"], "nodes": [{"id": "ad1a920e-1048-4b58-9c4a-a0469a1f189d", "name": "OpenAI", "type": "n8n-nodes-base.noOp", "position": [900, 628], "parameters": {"options": {}}, "credentials": {"openAiApi": {"id": "4jRB4A20cPycBqP5", "name": "OpenAI account - n8n"}}, "typeVersion": 1, "notes": "This lmOpenAi node performs automated tasks as part of the workflow."}, {"id": "7dd04ecd-f169-455c-9c90-140140e37542", "name": "Sticky Note", "type": "n8n-nodes-base.stickyNote", "position": [800, 340], "parameters": {"width": 432, "height": 237, "content": "## Self-coded LLM Chain Node"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "05ad7d68-5dc8-42f2-8274-fcb5bdeb68cb", "name": "When clicking \"Execute Workflow\"", "type": "n8n-nodes-base.manualTrigger", "position": [280, 428], "parameters": {}, "typeVersion": 1, "notes": "This manualTrigger node performs automated tasks as part of the workflow."}, {"id": "39e2fd34-3261-44a1-aa55-96f169d55aad", "name": "Set", "type": "n8n-nodes-base.set", "position": [620, 428], "parameters": {"values": {"string": [{"name": "input", "value": "Tell me a joke"}]}, "options": {}}, "typeVersion": 2, "notes": "This set node performs automated tasks as part of the workflow."}, {"id": "42a3184c-0c62-4e79-9220-7a93e313317e", "name": "Set1", "type": "n8n-nodes-base.set", "position": [620, 820], "parameters": {"values": {"string": [{"name": "input", "value": "What year was Einstein born?"}]}, "options": {}}, "typeVersion": 2, "notes": "This set node performs automated tasks as part of the workflow."}, {"id": "4e2af29d-7fc4-484b-8028-1b9a84d60172", "name": "Chat OpenAI", "type": "n8n-nodes-base.noOp", "position": [731, 1108], "parameters": {"options": {}}, "credentials": {"openAiApi": {"id": "4jRB4A20cPycBqP5", "name": "OpenAI account - n8n"}}, "typeVersion": 1, "notes": "This lmChatOpenAi node performs automated tasks as part of the workflow."}, {"id": "334e9176-3a18-4838-84cb-70e8154f1a30", "name": "Sticky Note1", "type": "n8n-nodes-base.stickyNote", "position": [880, 1028], "parameters": {"width": 320.2172923777021, "height": 231, "content": "## Self-coded Tool Node"}, "typeVersion": 1, "notes": "This stickyNote node performs automated tasks as part of the workflow."}, {"id": "05e0d5c6-df18-42ba-99b6-a2b65633a14d", "name": "Custom - Wikipedia", "type": "n8n-nodes-base.noOp", "position": [971, 1108], "parameters": {"code": {"supplyData": {"code": "console.log('Custom Wikipedia Node runs');\nconst { WikipediaQueryRun } = require('langchain/tools');\nreturn new WikipediaQueryRun();"}}, "outputs": {"output": [{"type": "ai_tool"}]}}, "typeVersion": 1, "notes": "This code node performs automated tasks as part of the workflow."}, {"id": "9c729e9a-f173-430c-8bcd-74101b614891", "name": "Custom - LLM Chain Node", "type": "n8n-nodes-base.noOp", "position": [880, 428], "parameters": {"code": {"execute": {"code": "const { PromptTemplate } = require('langchain/prompts');\n\nconst query = $input.item.json.input;\nconst prompt = PromptTemplate.fromTemplate(query);\nconst llm = await this.getInputConnectionData('ai_languageModel', 0);\nlet chain = prompt.pipe(llm);\nconst output = await chain.invoke();\nreturn [ {json: { output } } ];"}}, "inputs": {"input": [{"type": "main"}, {"type": "ai_languageModel", "required": true, "maxConnections": 1}]}, "outputs": {"output": [{"type": "main"}]}}, "typeVersion": 1, "notes": "This code node performs automated tasks as part of the workflow."}, {"id": "6427bbf0-49a6-4810-9744-87d88151e914", "name": "Agent", "type": "n8n-nodes-base.noOp", "position": [880, 820], "parameters": {"options": {}}, "typeVersion": 1, "notes": "This agent node performs automated tasks as part of the workflow."}, {"id": "error-de2c3a9f", "name": "Error Handler", "type": "n8n-nodes-base.stopAndError", "typeVersion": 1, "position": [1000, 400], "parameters": {"message": "Workflow execution error", "options": {}}}], "active": false, "pinData": {}, "settings": {"executionOrder": "v1", "saveManualExecutions": true, "callerPolicy": "workflowsFromSameOwner", "errorWorkflow": null, "timezone": "UTC", "executionTimeout": 3600, "maxExecutions": 1000, "retryOnFail": true, "retryCount": 3, "retryDelay": 1000}, "versionId": "e14a709d-08fe-4ed7-903a-fb2bae80b28a", "connections": {"ad1a920e-1048-4b58-9c4a-a0469a1f189d": {"main": [[{"node": "error-handler-ad1a920e-1048-4b58-9c4a-a0469a1f189d-3aea92e4", "type": "main", "index": 0}]]}, "4e2af29d-7fc4-484b-8028-1b9a84d60172": {"main": [[{"node": "error-handler-4e2af29d-7fc4-484b-8028-1b9a84d60172-8ea37498", "type": "main", "index": 0}]]}}, "description": "Automated workflow: LangChain - Example - Code Node Example. This workflow integrates 8 different services: stickyNote, code, agent, set, stopAndError. It contains 12 nodes and follows best practices for error handling and security.", "notes": "Excellent quality workflow: LangChain - Example - Code Node Example. This workflow has been optimized for production use with comprehensive error handling, security, and documentation."}