Zod

TypeScript-first schema validation with static type inference by @colinhacks

Zod 4 is now stable! Read the release notes here.

Interested in featuring? Get in touch.

Introduction

Zod is a TypeScript-first validation library. Using Zod, you can define schemas you can use to validate data, from a simple string to a complex nested object.

    import * as z from "zod";

    const User = z.object({
      name: z.string(),
    });

    // some untrusted data...
    const input = { /* stuff */ };

    // the parsed result is validated and type safe!
    const data = User.parse(input);

    // so you can use it with confidence :)
    console.log(data.name);

Features

Zero external dependencies
Works in Node.js and all modern browsers
Tiny: 2kb core bundle (gzipped)
Immutable API: methods return a new instance
Concise interface
Works with TypeScript and plain JS
Built-in JSON Schema conversion
Extensive ecosystem

Installation

    npm install zod

Zod is also available as @zod/zod on jsr.io.

Zod provides an MCP server that can be used by agents to search Zod’s docs. To add to your editor, follow these instructions. Zod also provides an llms.txt file.

Requirements

Zod is tested against TypeScript v5.5 and later. Older versions may work but are not officially supported.

"strict"

You must enable strict mode in your tsconfig.json. This is a best practice for all TypeScript projects.

    {
      // ...
      "compilerOptions": {
        // ...
        "strict": true
      }
    }

Ecosystem

Zod has a thriving ecosystem of libraries, tools, and integrations. Refer to the Ecosystem page for a complete list of libraries that support Zod or are built on top of it.

I also contribute to the following projects, which I’d like to highlight:

tRPC - End-to-end typesafe APIs, with support for Zod schemas
React Hook Form - Hook-based form validation with a Zod resolver
zshy - Originally created as Zod’s internal build tool. Bundler-free, batteries-included build tool for TypeScript libraries. Powered by tsc.

Featured sponsor: Jazz

Zod