1.pydantic / pydantic
Data validation using Python type hints
+380 stars
from 28,886 · score 5.94
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Ranked by Attention Score: stars gained over the last 30 complete days
10 repositories by Attention Score · Oct 4, 2026 – Nov 2, 2026 (UTC)
2.567-labs / instructor
structured outputs for llms
+134 stars
from 13,954 · score 4.91
3.unionai-oss / pandera
A light-weight, flexible, and expressive statistical data testing library
+37 stars
from 4,470 · score 3.64
4.python-jsonschema / jsonschema
An implementation of the JSON Schema specification for Python
+9 stars
from 4,985 · score 2.30
5.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
+7 stars
from 7,238 · score 2.08
6.antonagestam / phantom-types
Phantom types for Python.
+2 stars
from 233 · score 1.10
7.mcs07 / MolVS
Molecule Validation and Standardization
+2 stars
from 187 · score 1.10
8.pallets-eco / wtforms
A flexible forms validation and rendering library for Python.
+1 stars
from 1,582 · score 0.69
9.vertti / daffy
Lightweight DataFrame validation decorators for Pandas, Polars, Modin, and PyArrow. No custom types required.
+1 stars
from 59 · score 0.69
10.chrieke / geojson-invalid-geometry
🗺️ List of GeoJSON invalid geometry issues with example files
+1 stars
from 50 · score 0.69