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Pydantic · Error

PydanticUseDefault

PydanticUseDefault is an exception that custom validators can raise to make Pydantic use a field's default value. It is useful when a special input, such as None, should select that default.

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Syntax

raise PydanticUseDefault()

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  • BeforeValidator
  • field_validator
  • pydantic_core
  • PydanticSerializationError
  • PydanticSerializationUnexpectedValue

Source: pydantic_core | Pydantic Docs. Checked 2026-11-03.