FastAPI: Pydantic for Robust Request Bodies
A Pydantic model is a contract for your API's request body. It tells FastAPI what data to expect, automatically converting incoming JSON into a typed Python object. Use this for any POST or PUT endpoint. The footgun is declaring path params in the body model.
A Pydantic model acts as a strict contract for your API's request body. Instead of manually parsing JSON, you define a class inheriting from `BaseModel`, and FastAPI handles conversion, validation, and error handling. This is the standard for POST/PUT/PATCH endpoints, providing automatic API docs and editor autocompletion. A common mistake is trying to include path or query parameters in the body model; they must be declared as separate function arguments.
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