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A lightweight library for converting complex objects to and from simple Python datatypes.

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marshmallow: simplified object serialization

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

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Example

from datetime import date
from pprint import pprint

from marshmallow import Schema, fields


class ArtistSchema(Schema):
    name = fields.Str()


class AlbumSchema(Schema):
    title = fields.Str()
    release_date = fields.Date()
    artist = fields.Nested(ArtistSchema())


bowie = dict(name="David Bowie")
album = dict(artist=bowie, title="Hunky Dory", release_date=date(1971, 12, 17))

schema = AlbumSchema()
result = schema.dump(album)
pprint(result, indent=2)
# { 'artist': {'name': 'David Bowie'},
#   'release_date': '1971-12-17',
#   'title': 'Hunky Dory'}

In short, marshmallow schemas can be used to:

  • Validate input data.
  • Deserialize input data to app-level objects.
  • Serialize app-level objects to primitive Python types. The serialized objects can then be rendered to standard formats such as JSON for use in an HTTP API.

Get It Now

$ pip install -U marshmallow

Documentation

Full documentation is available at https://marshmallow.readthedocs.io/ .

Ecosystem

A list of marshmallow-related libraries can be found at the GitHub wiki here:

https://github.com/marshmallow-code/marshmallow/wiki/Ecosystem

Credits

Contributors

This project exists thanks to all the people who contribute.

You're highly encouraged to participate in marshmallow's development. Check out the Contributing Guidelines to see how you can help.

Thank you to all who have already contributed to marshmallow!

Contributors

Backers

If you find marshmallow useful, please consider supporting the team with a donation. Your donation helps move marshmallow forward.

Thank you to all our backers! [Become a backer]

Backers

Sponsors

marshmallow is sponsored by Route4Me.

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Professional Support

Professionally-supported marshmallow is now available through the Tidelift Subscription.

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License

MIT licensed. See the bundled LICENSE file for more details.