Zod Has a Free API — Heres How to Validate Everything in TypeScript

Zod is a TypeScript-first schema validation library. Define a schema once and get runtime validation, static types, and transformation — all with zero dependencies. Why Zod? TypeScript-first : Schemas ARE your types Zero dependencies : 52KB bundle Composable : Chain, merge, extend schemas Ecosystem : Works with tRPC, React Hook Form, Hono, Astro Error messages : Human-readable by default Transforms : Parse and transform in one step Install npm install zod Basic Schemas import { z } from ' zod ' ; const userSchema = z . object ({ name : z . string (). min ( 2 ). max ( 100 ), email : z . string (). email (), age : z . number (). int (). positive (). optional (), role : z . enum ([ ' admin ' , ' user ' , ' moderator ' ]), tags : z . array ( z . string ()). default ([]), }); // Infer TypeScript type from schema type User = z . infer < typeof userSchema > ; // { name: string; email: string; age?: number; role: 'admin' | 'user' | 'moderator'; tags: string[] } // Validate const result = userS