---
id: marshmallow
version: "4.3.1"
license: MIT
license_treatment: permissive
maintenance: active
---

# marshmallow — A lightweight library for converting complex datatypes to and from native Python datatypes.

License: permissive · Maintenance: active · Popularity: top 1,000 on PyPI

## Install

pip install marshmallow
uv add marshmallow
poetry add marshmallow

## Description

********************************************
marshmallow: simplified object serialization
********************************************

|pypi| |build-status| |pre-commit| |docs|

.. |pypi| image:: https://badgen.net/pypi/v/marshmallow
    :target: https://pypi.org/project/marshmallow/
    :alt: Latest version

.. |build-status| image:: https://github.com/marshmallow-code/marshmallow/actions/workflows/build-release.yml/badge.svg
    :target: https://github.com/marshmallow-code/marshmallow/actions/workflows/build-release.yml
    :alt: Build status

.. |pre-commit| image:: https://results.pre-commit.ci/badge/github/marshmallow-code/marshmallow/dev.svg
   :target: https://results.pre-commit.ci/latest/github/marshmallow-code/marshmallow/dev
   :alt: pre-commit.ci status

.. |docs| image:: https://readthedocs.org/projects/marshmallow/badge/
   :target: https://marshmallow.readthedocs.io/
   :alt: Documentation

.. start elevator-pitch

**marshmallow** is an ORM/ODM/framework-agnostic library for converting complex datatypes, such as objects, to and from native Python datatypes.

.. code-block:: python

    from datetime import date
    from pprint import pprint

    from marshmallow...

## AI interpretation — verify before relying

marshmallow converts complex Python objects to and from native Python datatypes, enabling validation, deserialization, and serialization for APIs and data interchange.

Verdict: marshmallow is a mature, well-maintained serialization library with no known vulnerabilities, permissive licensing, and minimal dependencies. It is production-ready and widely adopted for data validation and API integration.

[View on SkillFed](https://skillfed.io/packages/marshmallow) · [View on PyPI](https://pypi.org/project/marshmallow/)