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zod: Unify TypeScript Types and Runtime Validation

colinhacks/zod

·2026.08.30 20:14

Define a schema and get data validation and type inference at the same time. Zod is a TypeScript-first validation library that guarantees strongly typed results the moment input data is parsed. There is no need to manually declare types or write separate validation logic.

The core advantage is maintaining consistency between static types and runtime validation. The z.infer utility allows you to extract types directly from schemas and reuse them throughout your code. With zero external dependencies and a lightweight bundle size of 2kb gzipped, it runs on Node.js and all modern browsers.

For performance optimization, it also offers AOT compilation. Applying z.compile can improve parsing speed for complex objects or arrays by up to 9x. When validation fails, a ZodError is thrown with detailed error information, and safeParse allows you to handle results safely without try-catch blocks.

GitHub
GitHub repository

colinhacks/zod

TypeScript-first schema validation with static type inference

TypeScript

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