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Overview

n8n is an open-source workflow automation platform that supports calling large language models through AI nodes.

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Configuration Steps

1

Add Credentials

Go to Settings → Credentials → Add Credential, select OpenAI API
2

Enter Credentials

  • API Key: sk-xxx
  • Base URL: https://crazyrouter.com/v1
3

Use in Workflows

Add an OpenAI node or AI Agent node and select the credentials you just created.

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Workflow Examples

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AI Chat Node

{
  "node": "OpenAI Chat Model",
  "parameters": {
    "model": "gpt-4o",
    "messages": [
      { "role": "user", "content": "{{ $json.input }}" }
    ]
  }
}

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AI Agent Workflow

  1. Trigger → AI Agent → Output
  2. Select the Crazyrouter credentials in the AI Agent node
  3. Configure tools (such as HTTP Request, Code, etc.)

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Using HTTP Request Node

For more flexible control, you can use the HTTP Request node directly: 
Method: POST
URL: https://crazyrouter.com/v1/chat/completions
Headers:
  Authorization: Bearer sk-xxx
  Content-Type: application/json
Body:
  {
    "model": "gpt-4o",
    "messages": [{"role": "user", "content": "{{ $json.input }}"}]
  }
n8n’s AI Agent node supports tool calling (Function Calling) and can be combined with other n8n nodes to build complex automation workflows.