{"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","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,"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":{"OpenAI":{"main":[[]]},"Chat OpenAI":{"main":[[]]}},"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."}