Valibot

Valibot began as a spark of frustration during my bachelor's thesis at Stuttgart Media University in 2023. As a computer science student diving deep into TypeScript's type system, I kept bumping into validation libraries that, while powerful, often came with larger footprints that could impact bundle sizes in performance-sensitive apps. Why couldn't there be a tool as lightweight and precise, built to complement TypeScript's power? That question turned into Valibot: a schema validation library that's modular, fully type-safe, and ruthlessly efficient, clocking in at under 700 bytes gzipped with zero external dependencies.

At its core, Valibot's purpose is simple yet profound: empower developers to validate data with confidence and speed, without unnecessary overhead. Whether you're parsing API payloads, sanitizing form inputs, or wrangling config files, Valibot delivers intuitive, tree-shakable APIs that play perfectly with TypeScript's type narrowing. It's designed for the real world—performance-critical apps where every byte and millisecond counts—while maintaining 100% test coverage and rock-solid reliability. In just over two year, it's surged to millions of weekly downloads on npm, carving out its niche as a streamlined option alongside established tools like Zod, with adopters raving about how it transforms validation from a chore into a joy.

But Valibot isn't just code; it's a community ethos. Open source from day one, it's grown through contributor pull requests, user feedback loops, and collaborative docs that demystify advanced patterns. Looking ahead, our mission evolves: more fundamental improvements and ongoing refinements to stay in lockstep with TypeScript's innovations. Ultimately, Valibot exists to democratize robust validation—making it accessible, sustainable, and fun for solo devs, indie hackers, and enterprise teams alike. By joining Open Collective, we're not just sustaining a library; we're fueling a movement toward smarter, snappier JavaScript ecosystems. What's your validation story? Let's build it together.