N8n OpenAI-Compatible API Endpoints

Transform your n8n workflows into OpenAI-compatible API endpoints, allowing you to access multiple workflows as selectable AI models through a single integration.

What This Does

This workflow creates two API endpoints that mimic the OpenAI API structure:

• /models - Lists all n8n workflows tagged with aimodel (or any other tag of your choice)
• /chat/completions - Executes chat completions with your selected workflows, supporting both text and stream responses

Benefits

Access Multiple Workflows : Connect to all your n8n agents through one API endpoint instead of creating separate pipelines for each workflow.

Universal Platform Support : Works with any application that supports OpenAI-compatible APIs, including OpenWebUI, Microsoft Teams, Zoho Cliq, and Slack.

Simple Workflow Management : Add new workflows by tagging them with aimodel . No code changes needed.

Streaming Support : Handles both standard responses and streaming for real-time agent interactions .

How to Use

1. Download the workflow JSON file from this repository
2. Import it into your n8n instance
3. Tag your workflows with aimodel to make them accessible through the API
4. Create a new OpenAI credential in n8n and change the Base URL to point to your n8n webhook endpoints . Learn more about OpenAI Credentials
5. Point your chat applications to your n8n webhook URL as if it were an OpenAI API endpoint

Requirements

• n8n instance (self-hosted or cloud)
• Workflows you want to expose as AI models
• Any OpenAI-compatible chat application

Documentation

For detailed setup instructions and implementation guide, visit https://medium.com/@deleodufuye/how-to-create-openai-compatible-api-endpoints-for-multiple-n8n-workflows-803987f15e24.

Inspiration

This approach was inspired by Jimleuk’s workflow on n8n Templates.