Zod Has a Free TypeScript Schema Validation — Validate Data with Full Type Inference

A developer had TypeScript types AND Joi validation schemas AND JSON Schema definitions. Three sources of truth for the same data shape. They always drifted apart. Zod is a free TypeScript-first schema validation library. Define your schema ONCE, get runtime validation AND TypeScript types automatically. What Zod Offers for Free TypeScript First - Infer types directly from schemas Runtime Validation - Validate data at boundaries (APIs, forms) Composable - Build complex schemas from simple ones Error Messages - Detailed, customizable error messages Transforms - Parse and transform data in one step Async Validation - Async refinements and transforms Zero Dependencies - Tiny bundle, no dependencies Ecosystem - Works with React Hook Form, tRPC, Astro Quick Start import { z } from ' zod ' const UserSchema = z . object ({ name : z . string (). min ( 1 ), email : z . string (). email (), age : z . number (). min ( 18 ). optional (), }) type User = z . infer < typeof UserSchema > // TypeScript