Valibot Has a Free Validation Library That's 98% Smaller Than Zod — Tree-Shakeable Schema Validation

The Bundle Size Problem

Zod is great but ships 14KB minified to every user. For a simple email validation, that's overkill.

Valibot is tree-shakeable. Import only what you use. A simple schema compiles to <1KB.

What Valibot Gives You

Modular API

import * as v from 'valibot';

const UserSchema = v.object({
  name: v.pipe(v.string(), v.minLength(1)),
  email: v.pipe(v.string(), v.email()),
  age: v.optional(v.pipe(v.number(), v.integer(), v.minValue(0))),
});

type User = v.InferOutput<typeof UserSchema>;

Same concept as Zod. Pipe-based API enables tree-shaking — unused validators don't ship.

Parse and Validate

// Throws on error
const user = v.parse(UserSchema, requestBody);

// Safe parse
const result = v.safeParse(UserSchema, requestBody);
if (result.success) {
  console.log(result.output.name);
} else {
  console.log(result.issues);
}

Transform

const TrimmedEmail = v.pipe(
  v.string(),
  v.trim(),
  v.toLowerCase(),
  v.email()
);

const email = v.parse(TrimmedEmail, '  [e-mail]  ');
// '[e-mail]'

Bundle Size Comparison

Library	Full Bundle	Simple Schema
Zod	14.0KB	14.0KB
Yup	14.3KB	14.3KB
Valibot	7.1KB	0.7KB

Valibot's modular design means small forms ship tiny bundles.

Framework Integration

Works with: React Hook Form, SvelteKit, Remix, Qwik, Modular Forms — anywhere Zod works, Valibot can replace it.

Quick Start

npm install valibot

Zero dependencies. TypeScript-first.

Why This Matters

Validation is needed everywhere — forms, APIs, config files. Valibot proves you don't have to ship 14KB to every user just to check an email address.

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