Create universal OpenAI-compatible API endpoints for multiple AI workflows

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

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...

Best for

Engineering automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.aggregate, n8n-nodes-base.respondtowebhook, n8n-nodes-base.webhook, n8n-nodes-base.stickynote, n8n-nodes-base.n8n, n8n-nodes-base.set, n8n-nodes-base.code, n8n-nodes-base.if

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Dele Odufuye.

Original n8n.io source

1.1 Workflow description

Title: Create universal OpenAI-compatible API endpoints for multiple AI workflows
Workflow name: Create universal OpenAI-compatible API endpoints for multiple AI workflows

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

Download the workflow JSON file from this repository
Import it into your n8n instance
Tag your workflows with aimodel to make them accessible through the API
Create a new OpenAI credential in n8n and change the Base URL to point to your n8n webhook endpoints . Learn more about OpenAI Credentials
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.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Aggregate

Type / Role: n8n-nodes-base.aggregate - aggregate
Config choices: Version 1

Block 2 - Models Response

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.2

Block 3 - GET models

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2

Block 4 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 5 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 6 - Get many workflows

Type / Role: n8n-nodes-base.n8n - n8n
Config choices: Version 1

Block 7 - Edit Fields

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 8 - POST ChatCompletions

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2

Block 9 - Remap to Response API Schema

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 10 - Format Completion Response

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 11 - JSON Response

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.2

Block 12 - Text Response

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.2

Block 13 - Format Stream Response

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 14 - Is Stream?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 15 - Call workflow webhook

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 16 - Call workflow webhook1

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 17 - n8n Webhooks

Type / Role: @n8n/n8n-nodes-langchain.lmChatOpenAi - lmChatOpenAi
Config choices: Version 1.2

Block 18 - When chat message received

Type / Role: @n8n/n8n-nodes-langchain.chatTrigger - chatTrigger
Config choices: Version 1.1

Block 19 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 20 - Powered By n8n Workflow Models

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 2.2

Block 21 - Simple Memory

Type / Role: @n8n/n8n-nodes-langchain.memoryBufferWindow - memoryBufferWindow
Config choices: Version 1.3

3. Summary Table

Workflow	Create universal OpenAI-compatible API endpoints for multiple AI workflows
Complexity	advanced
Nodes	21
Categories	Engineering, AI Chatbot
Author	Dele Odufuye
Published	09 Oct 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/9438/9438.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Engineering workflows AI Chatbot workflows

Frequently asked questions

What does Create universal OpenAI-compatible API endpoints for multiple AI workflows do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Engineering, AI Chatbot use case.

Dele Odufuye

1 workflow

Nodes

n8n-nodes-base.aggregate n8n-nodes-base.respondtowebhook n8n-nodes-base.webhook n8n-nodes-base.stickynote n8n-nodes-base.n8n n8n-nodes-base.set n8n-nodes-base.code n8n-nodes-base.if

Complexity

advanced

Published 09 Oct 2025

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/9438/9438.json

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Create universal OpenAI-compatible API endpoints for multiple AI workflows

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

N8n OpenAI-Compatible API Endpoints

What This Does

Benefits

How to Use

Requirements

Documentation

Inspiration

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Aggregate

Block 2 - Models Response

Block 3 - GET models

Block 4 - Sticky Note2

Block 5 - Sticky Note3

Block 6 - Get many workflows

Block 7 - Edit Fields

Block 8 - POST ChatCompletions

Block 9 - Remap to Response API Schema

Block 10 - Format Completion Response

Block 11 - JSON Response

Block 12 - Text Response

Block 13 - Format Stream Response

Block 14 - Is Stream?

Block 15 - Call workflow webhook

Block 16 - Call workflow webhook1

Block 17 - n8n Webhooks

Block 18 - When chat message received

Block 19 - Sticky Note1

Block 20 - Powered By n8n Workflow Models

Block 21 - Simple Memory

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions