Can I use GET requests with a Request Body?

Technically the HTTP specification doesn't strictly forbid it, but it is highly recommended against. Proxies, caches, and many HTTP clients will drop the body of a GET request. Always use POST, PUT, or PATCH for bodies.

How do I handle lists of objects in the body?

You simply use standard Python type hints! If you want an array of users, define your argument as `users: list[User]`. FastAPI will expect a JSON array `[{}, {}]` and validate every item inside it against the Pydantic model.

What happens if the client sends malformed JSON?

Before Pydantic even gets to validate the fields, FastAPI's underlying JSON parser will catch the syntax error and immediately return a `422 Unprocessable Entity` or `400 Bad Request`.

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Request Body

Master JSON Request Bodies in FastAPI. Learn how to map incoming payloads to Pydantic models, handle multiple concurrent models, and force singular primitives into the body using the Body() function.

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