n8n Configuration and Usage of treerouter Tutorial

I. Add Account Credentials

In n8n, click overview, then click Credential

Select OpenAi in the pop-up window

Fill in the following information in the pop-up interface

If the following information appears after clicking save, it is successful

II. n8n Workflow Configuration for Third-party API
Add via http request:

Create a workflow

Select manual trigger

Add the next n8n workflow module and select the HTTP Request node

Fill in according to the information in the figure below

All use json format

{
"Authorization": "Bearer  API Key",
"Content-Type": "application/json"
}

{
"model": "gemini-2.5-pro-all",
"messages": [
{ "role": "system", "content": "You are an AI assistant" },
{ "role": "user", "content": "Hello" }
]
}

Click Execute step at the top for testing. If the OUTPUT on the right outputs the content normally, it means the n8n node configuration is successfully executed

III. n8n Image Generation Workflow Node Configuration

Add an HTTP Request node to configure a third-party API

Fill in the information according to the figure below

{
"Authorization": "sk-",
"Content-Type": "application/json"
}

{
    "model": "gpt-image-1",
    "prompt": "a white siamese cat",
    "n": 1,
    "size": "1024x1024"
}

Click test in the upper right corner, and the output result is fine

The output can be converted into an image through online transcoding