Marshmallow
JSON →Marshmallow is a lightweight library for converting complex datatypes to and from native Python datatypes. The current version is 4.2.3, released on March 28, 2026. It follows a regular release cadence, with updates approximately every few months.
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API endpoints
full doc /v1/registry/marshmallow
install /v1/registry/marshmallow/install
compatibility /v1/registry/marshmallow/compatibility