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 type auto-generated

const result = UserSchema.safeParse(inputData)
if (result.success) {
  console.log(result.data)  // fully typed
}

GitHub: colinhacks/zod - 35K+ stars

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