Zod

Widely adopted, TypeScript-first schema declaration and validation library that has become a standard in the modern web development ecosystem.

Cost

Free

Rating

★ People love it

Time to value

Quick Setup (< 1 hour)

You can use Zod to validate data structures in your TypeScript and JavaScript applications. It lets you define schemas for everything from simple strings to complex nested objects, then validate untrusted data against those schemas. Zod automatically infers TypeScript types from your schemas, so you get both runtime validation and compile-time type safety. It works in Node.js and browsers, has zero dependencies, and includes features like custom error messages, JSON Schema conversion, and metadata support.

What Zod does

Define schemas for data structuresValidate untrusted data against schemasParse data with automatic type inferenceConvert schemas to JSON Schema formatCreate custom validation error messagesTransform data during validationCompose complex schemas from simple onesValidate nested object structuresZero external dependencies with 2kb core bundleAutomatic TypeScript type inference from schemasWorks in both Node.js and browsersBuilt-in JSON Schema conversion supportImmutable API that returns new instancesCustom error message formattingExtensive ecosystem of integrationsSupport for complex nested object validation