<p align="center">
<img src="logo.svg" width="200px" align="center" alt="Zod logo" />
<h1 align="center">Zod</h1>
<p align="center">
TypeScript-first schema validation with static type inference
<br/>
by <a href="https://x.com/colinhacks">@colinhacks</a>
</p>
</p>
<br/>
<p align="center">
<a href="https://github.com/colinhacks/zod/actions?query=branch%3Amaster"><img src="https://github.com/colinhacks/zod/actions/workflows/test.yml/badge.svg?event=push&branch=master" alt="Zod CI status" /></a>
<a href="https://opensource.org/licenses/MIT" rel="nofollow"><img src="https://img.shields.io/github/license/colinhacks/zod" alt="License"></a>
<a href="https://www.npmjs.com/package/zod" rel="nofollow"><img src="https://img.shields.io/npm/dw/zod.svg" alt="npm"></a>
<a href="https://discord.gg/KaSRdyX2vc" rel="nofollow"><img src="https://img.shields.io/discord/893487829802418277?label=Discord&logo=discord&logoColor=white" alt="discord server"></a>
<a href="https://github.com/colinhacks/zod" rel="nofollow"><img src="https://img.shields.io/github/stars/colinhacks/zod" alt="stars"></a>
</p>
<div align="center">
<a href="https://zod.dev/api">Docs</a>
<span> • </span>
<a href="https://discord.gg/RcG33DQJdf">Discord</a>
<span> • </span>
<a href="https://twitter.com/colinhacks">𝕏</a>
<span> • </span>
<a href="https://bsky.app/profile/zod.dev">Bluesky</a>
<br />
</div>
<br/>
<br/>
<h2 align="center">Featured sponsor: Jazz</h2>
<div align="center">
<a href="https://jazz.tools/?utm_source=zod">
<picture width="85%" >
<source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/garden-co/jazz/938f6767e46cdfded60e50d99bf3b533f4809c68/homepage/homepage/public/Zod%20sponsor%20message.png">
<img alt="jazz logo" src="https://raw.githubusercontent.com/garden-co/jazz/938f6767e46cdfded60e50d99bf3b533f4809c68/homepage/homepage/public/Zod%20sponsor%20message.png" width="85%">
</picture>
</a>
<br/>
<p><sub>Learn more about <a target="_blank" rel="noopener noreferrer" href="mailto:sponsorship@colinhacks.com">featured sponsorships</a></sub></p>
</div>
<br/>
<br/>
<br/>
Read the docs →
<br/>
<br/>
What is Zod?
Zod is a TypeScript-first validation library. Define a schema and parse some data with it. You'll get back a strongly typed, validated result.
```ts
import * as z from "zod/v4";
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);
```
<br/>
Features
- Zero external dependencies
- Works in Node.js and all modern browsers
- Tiny:
2kbcore bundle (gzipped) - Immutable API: methods return a new instance
- Concise interface
- Works with TypeScript and plain JS
- Built-in JSON Schema conversion
- Extensive ecosystem
<br/>
Installation
```sh
npm install zod
```
<br/>
Basic usage
Before you can do anything else, you need to define a schema. For the purposes of this guide, we'll use a simple object schema.
```ts
import * as z from "zod/v4";
const Player = z.object({
username: z.string(),
xp: z.number(),
});
```
Parsing data
Given any Zod schema, use .parse to validate an input. If it's valid, Zod returns a strongly-typed _deep clone_ of the input.
```ts
Player.parse({ username: "billie", xp: 100 });
// => returns { username: "billie", xp: 100 }
```
Note — If your schema uses certain asynchronous APIs like async refinements or transforms, you'll need to use the .parseAsync() method instead.
```ts
const schema = z.string().refine(async (val) => val.length <= 8);
await schema.parseAsync("hello");
// => "hello"
```
Handling errors
When validation fails, the .parse() method will throw a ZodError instance with granular information about the validation issues.
```ts
try {
Player.parse({ username: 42, xp: "100" });
} catch (err) {
if (err instanceof z.ZodError) {
err.issues;
/* [
{
expected: 'string',
code: 'invalid_type',
path: [ 'username' ],
message: 'Invalid input: expected string'
},
{
expected: 'number',
code: 'invalid_type',
path: [ 'xp' ],
message: 'Invalid input: expected number'
}
] */
}
}
```
To avoid a try/catch block, you can use the .safeParse() method to get back a plain result object containing either the successfully parsed data or a ZodError. The result type is a discriminated union, so you can handle both cases conveniently.
```ts
const result = Player.safeParse({ username: 42, xp: "100" });
if (!result.success) {
result.error; // ZodError instance
} else {
result.data; // { username: string; xp: number }
}
```
Note — If your schema uses certain asynchronous APIs like async refinements or transforms, you'll need to use the .safeParseAsync() method instead.
```ts
const schema = z.string().refine(async (val) => val.length <= 8);
await schema.safeParseAsync("hello");
// => { success: true; data: "hello" }
```
Inferring types
Zod infers a static type from your schema definitions. You can extract this type with the z.infer<> utility and use it however you like.
```ts
const Player = z.object({
username: z.string(),
xp: z.number(),
});
// extract the inferred type
type Player = z.infer<typeof Player>;
// use it in your code
const player: Player = { username: "billie", xp: 100 };
```
In some cases, the input & output types of a schema can diverge. For instance, the .transform() API can convert the input from one type to another. In these cases, you can extract the input and output types independently:
```ts
const mySchema = z.string().transform((val) => val.length);
type MySchemaIn = z.input<typeof mySchema>;
// => string
type MySchemaOut = z.output<typeof mySchema>; // equivalent to z.infer<typeof mySchema>
// number
```