The best Ajv alternatives
4 tools that do a similar job to Ajv, 4 of them open source. Each entry says what it does and who it suits, so you can pick the one that fits instead of the most famous.
You're replacing
AjvA fast library that checks whether JSON data matches a schema, for Node.js and browsers.
- 1
Zod
Open source · MIT · ★ 44.2k
TypeScript-first library for validating data at runtime and inferring static types from the same schema.
Best for: TypeScript developers who want runtime checks that match their static types; Teams validating API request or response data in TypeScript projects
- 2
Formily
Open source · MIT · ★ 12.6k
A form library for React and Vue that handles complex and JSON-schema-driven forms.
Best for: Frontend developers building data-heavy forms with many linked fields; Teams that want forms generated from JSON Schema sent by a back end
- 3
Pydantic
Open source · MIT · ★ 29.3k
Validates Python data using standard type hints, converting and checking inputs automatically.
Best for: Python developers who already use type hints and want runtime checks on incoming data; Teams parsing JSON or config files into typed objects
- 4
SQLModel
Open source · MIT · ★ 18.5k
A Python library for working with SQL databases using Python classes, built on Pydantic and SQLAlchemy.
Best for: Python developers building FastAPI applications that use a SQL database; Developers who already know SQLAlchemy or Pydantic and want less duplicated model code
How we pick: tools in the same category that solve the same problem, projects that name each other as alternatives, and open-source projects that describe themselves as an alternative to Ajv. We don't take payment for placement.