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Pydantic · Decorator

validate_call

Use @validate_call to check function arguments against their type annotations before the function runs. It can also validate the return value and raises ValidationError for invalid calls.

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Syntax

validate_call(func: AnyCallableT, /) -> AnyCallableT
validate_call(*, config: ConfigDict | None = None, validate_return: bool = False) -> Callable[[AnyCallableT], AnyCallableT]

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  • ValidationError
  • ConfigDict
  • Field
  • Annotated
  • raw_function
  • Strict mode
  • TypedDict
  • Unpack

Source: Validation Decorator | Pydantic Docs. Checked 2026-11-03.