Dynamic MongoDB knowledge base chatbot with OpenAI GPT
Needs changesNeeds changes. This template uses 1 thing(s) that n8n 3.0 removes: AI Agent v1 (old agent modes). 1 breaking item(s) found. Static check, last run 2026-10-19.
What this workflow does
This AI workflow has 5 nodes and runs when a chat message arrives. Along the way it connects OpenAI Chat Model and MongoDB.
How it runs
Trigger: When a chat message arrives.
- Smart AI Agent (AI Agent): runs an AI agent, with model: OpenAI Chat Model; 1 tool (MongoDB Database Lookup); memory: Remember Chat History
Services it uses
Before you upgrade to n8n 3.0
1 thing in this workflow is removed in n8n 3.0. Fix it before you upgrade:
- AI Agent v1 (old agent modes) in Smart AI Agent (v1.7): replace with Latest AI Agent node (Tools Agent). For SQL Agent, use a Postgres or MySQL tool with a recent AI Agent.
| Removed in 3.0 | Replace with |
|---|---|
| AI Agent v1 (old agent modes) Smart AI Agent (v1.7) | Latest AI Agent node (Tools Agent). For SQL Agent, use a Postgres or MySQL tool with a recent AI Agent. |
Nodes used (5)
- OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi - Chat Trigger
@n8n/n8n-nodes-langchain.chatTrigger - AI Agent
@n8n/n8n-nodes-langchain.agent - Simple Memory
@n8n/n8n-nodes-langchain.memoryBufferWindow - Mongo Db Tool
n8n-nodes-base.mongoDbTool
From the author
This workflow creates an intelligent chatbot that uses your MongoDB database as a knowledge base. The AI agent can automatically query your MongoDB collections to provide accurate, contextual responses based on your stored documents and data. Who's it for…