A framework-agnostic validation library that uses a unit testing-like syntax for writing maintainable form validations.
Vest is a declarative validation framework that allows developers to write form validations using a syntax similar to unit testing frameworks like Jest or Mocha. It solves the problem of messy validation logic by providing a clean, maintainable way to define and run validations that are separate from application feature logic. Vest is designed to be framework-agnostic, working with any JavaScript UI library or vanilla JS.
Frontend and full-stack JavaScript developers who need a robust, type-safe validation solution for forms in React, Vue, Svelte, Angular, or other frameworks, especially those familiar with unit testing patterns.
Developers choose Vest for its intuitive unit testing-like syntax that reduces learning time, its framework-agnostic design that avoids vendor lock-in, and its strong TypeScript support with features like SSR hydration and Standard Schema compatibility, making it a versatile drop-in replacement for libraries like Zod or Yup.
Vest ✅ Declarative validations framework
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Uses `test` and `enforce` functions similar to Jest or Mocha, reducing learning curve for developers already comfortable with unit testing frameworks.
Works seamlessly with React, Vue, Svelte, Angular, and vanilla JavaScript, as highlighted in the README's playground examples, avoiding vendor lock-in.
Built with TypeScript, providing first-class type support for suites and validation results, ensuring type safety out of the box.
Includes built-in `runStatic` and `SuiteSerializer` for server-side validation and state hydration, enabling full-stack validation flows without extra setup.
Defining validations as separate test functions can be more verbose and boilerplate-heavy than concise schema-based libraries like Zod or Yup for basic forms.
Compared to established alternatives, Vest has a smaller community and fewer third-party integrations, which may limit plugin availability and community support.
Requires creating and managing suites, adding initial setup complexity compared to inline validation methods or drop-in schema validators.
Vest is an open-source alternative to the following products: