Zod Has a Free API — TypeScript Schema Validation in 11KB

Zod is the TypeScript-first schema validation library with 34K+ GitHub stars — it validates data at runtime AND infers TypeScript types automatically. Zero dependencies, 11KB. Why Zod? TypeScript-first — define schema once, get types automatically Zero dependencies — runs anywhere JavaScript runs Composable — combine, extend, transform schemas Error messages — detailed, customizable error reporting Ecosystem — React Hook Form, tRPC, Drizzle, Hono all use Zod Quick Start npm install zod import { z } from " zod " ; // Define a schema const UserSchema = z . object ({ name : z . string (). min ( 2 ). max ( 50 ), email : z . string (). email (), age : z . number (). min ( 18 ). max ( 120 ), role : z . enum ([ " admin " , " user " , " moderator " ]), }); // Infer TypeScript type (no manual type definition!) type User = z . infer < typeof UserSchema > ; // type User = { name: string; email: string; age: number; role: "admin" | "user" | "moderator" } // Validate data const result = UserSchema