How Can I Create a FastAPI Endpoint That Accepts Both Form and JSON Data?

Creating a FastAPI Endpoint for Flexible Data Reception

In FastAPI, it's possible to create an endpoint that can handle both form and JSON request bodies.

Option 1: Determine Content-Type Dynamically

• Create a dependency function to check the Content-Type header.
• Parse the request body using Starlette's methods based on the content type.
• Use a try-except block to catch any parsing errors.

Option 2: Use Optional Parameters

• Define your endpoint with File and Form parameters marked as Optional.
• Check if the parameters have values to determine if form data was sent.
• Otherwise, attempt to parse the request body as JSON.

Option 3: Separate Endpoints with Middleware

• Create separate endpoints for JSON and form data requests.
• Use a middleware to check the Content-Type and redirect the request to the appropriate endpoint.

Option 4: Consider Combined Requests

• Utilize Pydantic's model_validate_json() method to parse JSON bodies passed in Form parameters.
• Allow for the submission of both JSON and form data in a single request by making endpoint parameters optional.

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