Valibot

Valibot is a modular, type-safe schema validation library for JavaScript and TypeScript, designed as a lightweight alternative to Zod. Version 1.4.1 ships with full TypeScript support, zero dependencies, and a tree-shakable modular architecture that starts at under 700 bytes. It provides both exception-based parsing (parse) and safe parsing (safeParse, is), along with 100% test coverage. The library distinguishes itself by enabling up to 95% bundle size reduction compared to Zod through tree-shaking. It requires TypeScript >=5. The API is based on many small, independent functions rather than a monolithic class, making it easily extensible. Stable release cadence with active development on GitHub.