1.pydantic / pydantic
Data validation using Python type hints
+1,809 stars
from 27,457 · score 7.50
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Ranked by Attention Score: stars gained over the last 180 complete days
10 repositories by Attention Score · May 7, 2026 – Nov 2, 2026 (UTC)
2.567-labs / instructor
structured outputs for llms
+1,257 stars
from 12,831 · score 7.14
3.unionai-oss / pandera
A light-weight, flexible, and expressive statistical data testing library
+201 stars
from 4,306 · score 5.31
4.python-jsonschema / jsonschema
An implementation of the JSON Schema specification for Python
+71 stars
from 4,923 · score 4.28
5.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
+44 stars
from 7,201 · score 3.81
6.pallets-eco / wtforms
A flexible forms validation and rendering library for Python.
+17 stars
from 1,566 · score 2.89
7.marshmallow-code / webargs
A friendly library for parsing HTTP request arguments, with built-in support for popular web frameworks, including Flask, Django, Bottle, Tornado, Pyramid, webapp2, Falcon, and aiohttp.
+10 stars
from 1,401 · score 2.40
8.mcs07 / MolVS
Molecule Validation and Standardization
+8 stars
from 181 · score 2.20
9.antonagestam / phantom-types
Phantom types for Python.
+2 stars
from 233 · score 1.10
10.vertti / daffy
Lightweight DataFrame validation decorators for Pandas, Polars, Modin, and PyArrow. No custom types required.
+2 stars
from 58 · score 1.10