ajv
Another JSON Schema Validator
The fastest JSON Schema validator.
When to choose it: You use the JSON Schema standard (e.g. OpenAPI payloads) and want maximum validation performance.
- + Extremely fast
- + JSON Schema standard
- + Great for APIs
- - JSON Schema, not TS-first
- - Verbose schemas
- Latest version
- 8.20.0
- Monthly downloads
- 1,239,468,287
- GitHub stars
- 14,721
- Minified + gzip
- 32.0 kB
- Dependencies
- 4
- License
- MIT
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Data from npm, Bundlephobia and GitHub. Last updated 2026-06-02.