LangChain Workflow Retriever with OpenAI

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": "mjCQV12PbF6fw8hR",
  "name": "LangChain - Example - Workflow Retriever",
  "tags": [
    {
      "id": "snf16n0p2UrGP838",
      "name": "LangChain - Example",
      "createdAt": "2023-09-25T16:21:55.962Z",
      "updatedAt": "2023-09-25T16:21:55.962Z"
    }
  ],
  "nodes": [
    {
      "id": "efdc3050-6c68-4419-9f12-f37d6fefb276",
      "name": "When clicking \"Execute Workflow\"",
      "type": "n8n-nodes-base.manualTrigger",
      "position": [
        460,
        200
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "e0edb9ab-c59f-4d34-983d-861bb2df4f01",
      "name": "Workflow Retriever",
      "type": "@n8n/n8n-nodes-langchain.retrieverWorkflow",
      "position": [
        1120,
        440
      ],
      "parameters": {
        "workflowId": "QacfBRBnf1xOyckC"
      },
      "typeVersion": 1
    },
    {
      "id": "ba47dd13-67d0-499a-b9a2-16928099efce",
      "name": "Retrieval QA Chain2",
      "type": "@n8n/n8n-nodes-langchain.chainRetrievalQa",
      "position": [
        900,
        200
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "id": "f6d16571-0573-4860-aed9-611f93b050ad",
      "name": "OpenAI Chat Model",
      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
      "position": [
        800,
        480
      ],
      "parameters": {
        "options": {}
      },
      "credentials": {
        "openAiApi": {
          "name": "<your credential>"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "4fd00751-3db0-489b-8c7f-4ee0fb32fb51",
      "name": "Example Prompt",
      "type": "n8n-nodes-base.set",
      "position": [
        680,
        200
      ],
      "parameters": {
        "fields": {
          "values": [
            {
              "name": "input",
              "stringValue": "What notes can you find for Jay Gatsby and what is his email address?"
            }
          ]
        },
        "options": {}
      },
      "typeVersion": 3
    },
    {
      "id": "732b6277-cb4d-4586-ab95-778ac9473fe5",
      "name": "Sticky Note",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        860,
        140
      ],
      "parameters": {
        "width": 363,
        "height": 211.90203341144422,
        "content": "### Q&A on data returned from a workflow"
      },
      "typeVersion": 1
    },
    {
      "id": "f09583a3-78e3-4888-8251-2148ffb7ab18",
      "name": "Sticky Note1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        1040,
        400
      ],
      "parameters": {
        "width": 262.67019427016413,
        "height": 255.8330939602389,
        "content": "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nReplace \"Workflow ID\" with the ID the Subworkflow got saved as"
      },
      "typeVersion": 1
    }
  ],
  "active": false,
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "48d3bdae-4cec-4b18-b92a-89215def0c68",
  "connections": {
    "Example Prompt": {
      "main": [
        [
          {
            "node": "Retrieval QA Chain2",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "OpenAI Chat Model": {
      "ai_languageModel": [
        [
          {
            "node": "Retrieval QA Chain2",
            "type": "ai_languageModel",
            "index": 0
          }
        ]
      ]
    },
    "Workflow Retriever": {
      "ai_retriever": [
        [
          {
            "node": "Retrieval QA Chain2",
            "type": "ai_retriever",
            "index": 0
          }
        ]
      ]
    },
    "When clicking \"Execute Workflow\"": {
      "main": [
        [
          {
            "node": "Example Prompt",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  }
}

Credentials you'll need

Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.

• openAiApi

About this workflow

LangChain - Example - Workflow Retriever. Uses manualTrigger, retrieverWorkflow, chainRetrievalQa, lmChatOpenAi. Event-driven trigger; 7 nodes.

Source: https://github.com/Zie619/n8n-workflows — original creator credit. Request a take-down →

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