No known security advisories.
The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.
marshmallow has 126.7M monthly downloads and 7K GitHub stars. Version 4.3.0 supports Python 3.10+, first published in 2013.
It is actively maintained under a permissive license, last released in Apr 2026.
It is built on top of backports-datetime-fromisoformat and typing-extensions. It is used by 968 tracked packages, including dataclasses-json, apache-airflow-providers-fab and great-expectations.
GitHub topics include serialization, deserialization and validation.
Package Insights
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
100
Popularity
82
Adoption
70
Community
70
Provenance
100
How the maintenance status was determined
Last commit
5 days ago
Monthly downloads
126,673,793
•
Active
Activity within 30 days
Stable
Activity within 31-180 days
Minimal
Activity within 181-365 days, or no activity data
At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
126,673,793
Stars
7,242
Stars per 1k downloads
0.06
•
Industry Standard
> 10,000,000 monthly downloads
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
Community Favorite
> 5 stars per 1k downloads
Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
3,867,045
Month daily avg
4,222,460
Momentum
-8.4%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100Python version support tiers
requires_python
>=3.10
Cutting Edge
Minimum supported version is 3.12 or newer
•
Modern
Minimum supported version is 3.9, 3.10, or 3.11
Legacy
Supports 3.8 or older (or Python 2)
Unknown
No requires_python specified or unparseable
License categories
License
MIT
•
Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
94 days ago
Total releases
200
Releases/year
15.8
•
Rapid
Last release within 365 days and > 12 releases/year
Regular
Last release within 365 days
Slow
Last release 366-730 days ago
Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
193
Monthly downloads
126,673,793
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
•
Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
64
Issue Burden
16.7
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
27.7%
contrib / forks
Stale Release
88d
PR Velocity
Quiet
Weekly Downloads
GitHub Stars
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.
Downloads by OS
Linux
2.4M
Windows
28.7K
macOS
18.2K
Python Versions
3.12
32.0%
714.4K
3.10
28.4%
632.4K
3.11
25.6%
570.9K
3.13
8.9%
197.4K
3.14
5.2%
115.6K
Top Countries
1.
US
1.7M
US
2.
IE
189.5K
IE
3.
NL
143.6K
NL
4.
DE
73.4K
DE
5.
IN
58.3K
IN
6.
SG
34.0K
SG
7.
GB
30.0K
GB
8.
BR
20.2K
BR
9.
AU
18.5K
AU
10.
FR
15.5K
FR
Dependencies
2
Used By
968
- dataclasses-json
- apache-airflow-providers-fab
- great-expectations
- marshmallow-sqlalchemy
- marshmallow-enum
- apache-airflow-providers-amazon
- marshmallow-oneofschema
- safety
- marshmallow-dataclass
- environs
- azure-ai-ml
- webargs
- apache-superset
- amazon-textract-response-parser
- flask-marshmallow
- flask-smorest
- marshmallow-union
- dataclasses-json-speakeasy
- platformio
- httpstan
- marshmallow-jsonschema
- azureml-featurestore
- pioarduino
- eyes-common
- ggshield
- flytekit
- pygitguardian
- netapp-ontap
- promptflow-devkit
- pytenable
- apispec-oneofschema
- acryl-great-expectations
- apiflask
- deepfriedmarshmallow
- marshmallow-fastoneofschema
- dataengine
- cycode
- gladiaio-sdk
- gpt-researcher
- pytest-jira
- aws-parallelcluster
- flask-accepts
- qm-qua
- invenio-rest
- cg
- wsidicom
- ansys-hps-client
- starknet-py
- getstream
- logging-gelf
GitHub Topics
Tags from the package's GitHub repository describing what it does.
Package Information
License
MIT
First Release
November 11, 2013
Last Release
3 months ago
Last Commit
5 days ago
Latest Version
4.3.0
Total Releases
200
Contributors
193
Open PRs
19
Archived
No
Python Versions
3
3.10
3.11
3.12
3.13
3.14
Wheels
py2
py3
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh