Valibot

Valibot is an open-source schema library designed to validate unknown data with a focus on bundle size, type safety, and developer experience. It offers full type safety and static type inference in TypeScript, ensuring that developers can work with confidence in their code's accuracy. Valibot's modular design allows for a minimal bundle size, starting at less than 600 bytes, by enabling bundlers to include only the necessary code for production builds. This modularity also allows for significant bundle size reductions, potentially up to 95% compared to similar tools like Zod, making it particularly advantageous for client-side form validation.

The library supports a wide range of TypeScript types, from primitive values to complex objects, ensuring comprehensive data validation capabilities. With 100% test coverage, Valibot guarantees reliability and robustness in its operations. It also includes essential validation and transformation helpers, enhancing its utility and ease of use. The API is designed to be minimal, readable, and thoughtful, providing an excellent developer experience.

Valibot is available free of charge under the MIT License, with development funded independently. It creates schemas that not only define data structures but also enforce type safety at runtime, distinguishing it from TypeScript types that are not executed. This makes Valibot a powerful tool for developers looking to ensure data integrity and type safety in their applications.