Open Collective

marshmallow

COLLECTIVE
serialization
deserialization
rest
api
marshalling
python
python-2
python-3
validation
Open source
Fiscal Host: Open Source Collective

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

This is marshmallow's pagemarshmallow
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Become a backer for $5.00 per month and support us

Starts at
$5 USD / month

Latest activity by

+ 10
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Become a sponsor for $100.00 per month and help us sustain our activities! We'll also display your company logo and website on the marshmallow READ... Read more

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$100 USD / month

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Latest activity by

+ 34

Top financial contributors

Individuals

1
Route4Me Route Planner

$2,000 USD since Aug 2024

2
Dash Hudson

$1,250 USD since Jan 2021

3
Michael Fowlie

$500 USD since Aug 2019

4
Brian G

$390 USD since Oct 2019

5
Grey Li

$245 USD since May 2021

6
Ahmed Alrasheed

$130 USD since Aug 2020

7
Antony Gelberg

$125 USD since Mar 2019

8
Jeffrey Hilger

$100 USD since Oct 2018

9
Adam Grandt

$100 USD since Oct 2018

10
Khem R

$80 USD since Sep 2021

Organizations

1
Gorgias

$5,300 USD since May 2018

2
Fern

$1,046.48 USD since Oct 2024

3
SimSol Technologies and Services Private Limited

$200 USD since Oct 2019

4
HebergeurWeb.ca

$155 USD since Dec 2018

5
Trash Nothing

$12 USD since Sep 2025

6
Scraper API 2

$5 USD since Oct 2018

marshmallow is all of us

Our contributors 40

Thank you for supporting marshmallow.

Steve

Admin

Jérôme Lafréc...

Admin

Gorgias

sponsor

$5,300 USD

Route4Me Rout...

sponsor

$2,000 USD

Dash Hudson

$1,250 USD

Fern

sponsor

$1,046 USD

Michael Fowlie

backer

$500 USD

Brian G

backer

$390 USD

Django Fund

$386 USD

Grey Li

backer

$245 USD

SimSol Techno...

backer

$200 USD

A great initiative worth all our support. Way t...

HebergeurWeb.ca

backer

$155 USD

Budget

Transparent and open finances.

Monthly financial contribution to marshmallow (backer)

Credit from RJ Nowling to marshmallow •

+$5.00USD
Completed
Contribution #840289
Monthly financial contribution to marshmallow (sponsor)

Credit from Route4Me Route Planner to marshmallow •

+$100.00USD
Completed
Contribution #781771
Monthly financial contribution to marshmallow (backer)

Credit from Brian G to marshmallow •

+$5.00USD
Completed
Contribution #54814
$
Today’s balance

$366.63 USD

Total raised

$10,904.30 USD

Total disbursed

$10,537.67 USD

Estimated annual budget

$1,347.00 USD

Connect

Let’s get the ball rolling!

News from marshmallow

Updates on our activities and progress.

Mashmallow 4 released!

Marshmallow v4 is out! Compared to marshmallow 3, it contains less breaking changes, so the upgrade should be smooth to most users. The removal of deprecated features makes the code easier to maintain and unlocks future enhancements. See th...
Read more
Published on April 19, 2025 by Jérôme Lafréchoux

Marshmallow news

Dear contributors. Two years have passed since our last news here so we figured it was time to provide an update. After the important changes made for marshmallow 3, we wanted to keep it stable for a while. We have been introducing new feat...
Read more
Published on January 13, 2022 by Jérôme Lafréchoux

webargs 6.0.0 release

webargs 6.0.0 is the result of an important refactor.The new "one location per schema" approach unlocks the use of schema-level features such as pre/post processors or dealing with unknown fields.We also dropped Python 2 and moved from F...
Read more
Published on February 27, 2020 by Jérôme Lafréchoux

About

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

This collective funds the development of marshmallow and other projects in the marshmallow-code organization, including:

Our team

Steve

Admin

Jérôme Lafréc...

Admin