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Pydantic · Function

field_serializer

field_serializer customizes how Pydantic model fields are serialized. Use plain mode to replace the default behavior or wrap mode to call and modify it.

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Syntax

@field_serializer(field, *fields, mode='plain', return_type=..., when_used='always', check_fields=None)

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  • PlainSerializer
  • WrapSerializer
  • SerializationInfo
  • FieldSerializationInfo
  • SerializerFunctionWrapHandler

Source: Functional Serializers | Pydantic Docs. Checked 2026-11-03.