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Pydantic · Class

PlainSerializer

PlainSerializer uses a function to change how an annotated value is serialized. It can declare the output type and run only in selected serialization modes.

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Syntax

PlainSerializer(func, *, return_type=..., when_used='always')

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  • WrapSerializer
  • field_serializer
  • model_serializer
  • SerializationInfo

Source: Functional Serializers. Checked 2026-11-03.