Why n8n + LangChain?
n8n gives non-technical teams a visual interface to trigger and schedule workflows. Pair it with a LangChain FastAPI backend and suddenly your product managers can build AI automations without writing code.
Architecture
n8n triggers → HTTP Request node → FastAPI LangChain endpoint → result posted back to Slack/email/database. Simple, observable, and maintainable.
Practical Example: Scheduled RAG Re-indexing
An n8n cron node fires every night, calls a FastAPI endpoint that pulls new documents from Notion, chunks and embeds them, and upserts into ChromaDB. Your RAG system stays fresh without any manual work.
Slack Research Agent
A Slack trigger node passes a user question to a LangGraph research agent. The agent searches the web, summarises findings, and posts a cited response back to the Slack thread — all within seconds.
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