cattrs 26.2.0
Worth it
Confidence: Medium
Adopt cattrs if your Python codebase uses attrs or dataclasses and moves typed data across JSON, msgpack, or YAML boundaries.
Comparison
cattrs 26.2.0 vs marshmallow
cattrs 26.2.0 and marshmallow both land on Worth it.
marshmallow
Worth it
Confidence: Low
If your team writes Python and needs objects converted to and from JSON with validation, this free open-source library is a solid, standard choice.
| Compare | cattrs 26.2.0 | marshmallow |
|---|---|---|
| Verdict | Worth it | Worth it |
| Best for | Python teams using attrs or dataclasses | Python API teams |
| Who it's not for | Non-Python stacks . it's a Python package, full stop | Non-developers . it's a code library, not software you operate |
| Privacy | No known public vulnerabilities found in the sources reviewed.⁹ | Actively maintained open-source project with a GitHub security policy; one 2018 CVE and one Ubuntu advisory on record.16 |
| Public sentiment | No independent user reviews found in the sources; third-party tutorials praise the Pythonic API, examples, and active maintenance.⁶ | No usable user reviews of the Python library surfaced; every review found concerns unrelated products sharing the name. |
| Biggest gotcha | Open source with no SLA; help means GitHub issues and docs | Running 2.x? CVE-2018-17175 is published against it . upgrade before production.16 |
Pick cattrs 26.2.0 when
- Python teams using attrs or dataclasses
- Serialization-heavy APIs and pipelines
- Devs wanting typed, validated data at the edges
When cattrs 26.2.0 is not a fit
- Non-Python stacks . it's a Python package, full stop
- Simple scripts where built-in json plus dataclasses suffice
- Pydantic-first teams already validating at the edges
- Buyers wanting a vendor, SLA, or support contract . there is none
Pick marshmallow when
- Python API teams
- REST/JSON payload validation
- Framework-agnostic serialization
- Flask and Django backends
When marshmallow is not a fit
- Non-developers . it's a code library, not software you operate
- Non-Python stacks (JavaScript, Ruby, Go)
- Teams wanting a UI, dashboard, or vendor support
- One-off scripts . plain dicts and json suffice
Sources
- cattrs 26.2.0 documentationcatt.rsofficial
- cattrs - PyPIpypi.orgofficial
- Validation - cattrs docscatt.rsofficial
official
- Intro to cattrs 23.1.0 - The Three of Wandsthreeofwands.comreview
- Cattrs: Python Package Guide - Generalist Programmergeneralistprogrammer.comreview
- cattrs migration question - Stack Overflowstackoverflow.comreview
- Security - python-attrs/cattrs on GitHubgithub.comsecurity
- History - cattrs docscatt.rsofficial
- marshmallow documentationmarshmallow.readthedocs.ioofficial
- marshmallow security page (Read the Docs)marshmallow.readthedocs.ioofficial
- marshmallow security policy (GitHub)github.comofficial
- Linux Foundation project security insightsinsights.linuxfoundation.orgsecurity
security
- NVD CPE entry for marshmallow 2.0.0nvd.nist.govsecurity