Pydantic v2

Pydantic v2 is a high-performance data validation and serialization library for Python, rebuilt in Rust for up to 20x speed improvements.

Pydantic v2 leverages a Core engine written in Rust to deliver massive performance gains over its predecessor (v1). It enforces type hints at runtime, providing clear error messages and automated data conversion for complex Python objects. This version introduces a strict mode to prevent silent data coercion and integrates seamlessly with FastAPI and SQLAlchemy. By moving the heavy lifting to the pydantic-core layer, it handles thousands of validations per second with minimal overhead.

https://docs.pydantic.dev/latest/