zod

v3.24.2MITTS Ready

TypeScript-first schema declaration and validation library with static type inference.

98/ 100

Excellent Health

Weekly Downloads

18.5M

Bundle Size (gzip)

13.1 kB(42.8 kB min)

Dependencies

Zero Deps

Last Updated

2025-02-18

SPONSORED CLOUD & DEV TOOLS•Google Ads Partner

NPMBot AI Assessment

The reigning king of TypeScript validation, power tool for tRPC, Next.js, and forms.

Zod changed TypeScript development by unifying runtime validation with static TypeScript type inference (`z.infer<typeof schema>`). It is the primary validator in modern tech stacks. Its only notable downside is its monolithic runtime bundle size (~13kB), which inspired modular alternatives like Valibot.

Key Advantages

•Seamless static type inference without duplicate type definitions
•Vast ecosystem integrations: React Hook Form, tRPC, Drizzle, Prisma, Astro
•Rich validation primitives (transforms, refinements, async validation)
•Zero runtime dependencies

Gotchas & Limitations

•Not granularly tree-shakeable: importing any validator includes most of Zod (~13kB)
•Validation speed is solid, but slower than specialized engines like TypeBox or ArkType

Recommended For:

Next.js Server Actions, API route inputs, and tRPC backends, React Hook Form form schemas

Avoid If:

Ultra-lean client bundles where Valibot can achieve 90% size reduction

FEATURED PARTNER•Google Ads Partner

Installation & Quickstart

Package Manager Command

javascript

npm install zod

zod Usage Example

javascript

import { z } from 'zod';

const UserSchema = z.object({
  name: z.string().min(2),
  email: z.string().email(),
  age: z.number().optional()
});

type User = z.infer<typeof UserSchema>;

Compare zod with Alternatives

Recommended Alternatives

valibot-88% size

Modular, tree-shakeable alternative with up to 95% smaller bundle

yup+10%

Traditional validation library popularized by Formik

View full zod alternatives radar →

Repository & Links

NPM Official Registry Official Documentation GitHub Repository