msgspec
High-performance schema validation and serialization library for JSON, MessagePack, YAML, and TOML — written in C.
data-validation-frameworksNew to PyRadar
60
Hero Score
Popularity
72
Performance
60
Ecosystem
25
Maturity
77
Dev Experience
68
⭐ 3,778 stars⬇ 9.2M downloads/wkFirst release: Feb 2021Last release: Apr 2026
Async Support: NoPlugin Extensions: GrowingSpeed: Very fastDoc Quality: HighLearning Curve: Medium
Pros
- • Extremely fast — 10-80x faster than Pydantic for validation and serialization
- • Zero dependencies and tiny install footprint
- • Multi-format support (JSON, MessagePack, YAML, TOML) out of the box
Cons
- • Smaller ecosystem and fewer integrations than Pydantic
- • Less flexible custom validation compared to Pydantic validators
- • Younger project with smaller community and tutorial base