AI-Powered Automation: Connect ChatGPT to n8n
Published: March 21, 2025
Seamlessly integrate with Python processing, APIs, Databases, Google Apps Script, Sheets and more for real-time updates, workflow automation, reports, PDF & decks
Check out dedicated Custom GPT section on REX AI Co Analyst site
- Full templates
- How-to guides
- Backend code
- Technical breakdowns
- Resource Links
Automations
n8n's extensive workflow nodes, routing nodes, connectors, and AI nodes make it a powerful tool for automation and apps - AI-enabled or otherwise. Handle processing within n8n or connect to any external system or custom code. Self-hosted version is free - with unlimited executions, workflows, and access to community nodes.
Connect n8n to any User Interface
Connect n8n to any UI, including ChatGPT. Can also be easily connected to a custom UI like AI Co-Analyst (React JS) at tigzig.com… or simply use native n8n UI
ChatGPT Advantage
Simple to set up, and provides off-the-shelf access to GPT-4o capabilities: AI Agent, Mobile App, Web Search, Realtime Voice, Python Code Interpreter...
How to Connect n8n to ChatGPT
Update custom actions in Custom GPT using an OpenAPI schema to connect to an n8n workflow. Any LLM /AI coder can generate one -example schema shared in comments
Use Cases
- Automate backend update
Update any backend system accessible via an API. Example shared - Postgres DB / Google Sheets
- Process with Python with file output passed through
Example: On-the-fly Markdown to PDF via FastAPI server
- Automate with Google Apps Script
Apps Script enables JavaScript-based processing, deployed as an API endpoint-a powerful tool. Example: generate formatted PDF & Slides, then email them out
- Process and transform data within n8n
Example - simple update via Edit Node. Combined with Code node and Routing nodes, you can do a fairly complex processing within n8n
- Dynamic database connections
Example shared - connect to any database on-the-fly and review records. Uses a custom FastAPI server - you could also use a n8n Switch node, routing to MySQL/Postgres nodes
- AI powered content enhancement
Enhance content with LLM + web searches. Example shared-structure rough user input into a coherent data row and suggest business use cases
Note: sharing a small set of common use cases. Also, multiple ways to do these - depends on the use case.
Try it/ Replicate it
Custom GPT, n8n schema, source code, and resource links: n8n Workflows & Schemas. Video has demo + architecture and workflow walkthrough: https://lnkd.in/gjV_z8UU
Build AI Co-Analyst Apps for Analytics
Explore 15+ open-source AI analytics apps at tigzig.com
Source Codes & Resources
Custom GPT
Feel free to try out the markdown-to-PDF functionality and Google Sheets updates. Google Sheet available at https://docs.google.com/spreadsheets/d/1LPV1pZb4Bc3TMVAYqqH8MCNU55Ew8oB1K8MZMu2cfp0/edit?gid=0#gid=0. You can also connect to any remote database by providing DB credentials-get an instant free Postgres DB at neon.tech.
n8n Workflow and OpenAPI Schema for Custom GPT
FastAPI Server: Markdown-to-PDF
No environment variables required. After deployment, you just need to update the URL in the HTTP request node as per the schema shared above.
FastAPI Server: Database Connection
No environment variables required for simple database connectivity in this workflow. After deployment, you just need to update the URL in the HTTP request node as per the schema shared above.
Automation with Google Apps Script: Source Code & Video Guide
See video guide: https://lnkd.in/gjV_z8UU
You can directly jump to the Google Apps Script section. Once deployed, you just need to update the web service URL in the n8n HTTP request node as per the schema shared above.