Schema Validation in 2025: Zod vs Yup vs Valibot vs ArkType

Runtime Validation Matters

TypeScript types disappear at runtime. Schema validation libraries ensure your data matches expected shapes when it enters your application.

Quick Comparison

Zod: The Standard

Zod has become the de facto choice for TypeScript validation.

Key Features

• TypeScript-first - infer types from schemas
• Composable - build complex schemas
• Transforms - parse and transform data
• Error messages - customizable errors
• Ecosystem - React Hook Form, tRPC, etc.

Example

```typescript import { z } from 'zod';

const UserSchema = z.object({ name: z.string().min(2), email: z.string().email(), age: z.number().min(18).optional(), });

type User = z.infer<typeof UserSchema>;

const result = UserSchema.safeParse(data); if (result.success) { console.log(result.data); } else { console.log(result.error.issues); } ```

Best For

• Most TypeScript projects
• Form validation
• API validation

Valibot: The Lightweight Champion

Valibot offers Zod-like DX with minimal bundle size.

Key Features

• 1kb bundle - 90% smaller than Zod
• Tree-shakeable - only import what you use
• Zod-like API - familiar syntax
• Fast - optimized performance

Example

```typescript import * as v from 'valibot';

const UserSchema = v.object({ name: v.pipe(v.string(), v.minLength(2)), email: v.pipe(v.string(), v.email()), age: v.optional(v.pipe(v.number(), v.minValue(18))), });

type User = v.InferOutput<typeof UserSchema>; ```

Best For

• Bundle-size sensitive apps
• Edge functions
• Performance-critical code

Yup: The Veteran

Yup has been the standard for years, especially with Formik.

Key Features

• Mature - battle-tested
• Async validation - built-in support
• Formik integration - seamless
• Localization - i18n support

Best For

• Formik users
• Existing Yup codebases
• Complex async validation

ArkType: The Performance King

ArkType offers the best runtime performance with advanced type inference.

Key Features

• Fastest runtime - optimized validation
• Advanced inference - complex type support
• Morphs - powerful transforms
• Scopes - reusable definitions

Best For

• Performance-critical applications
• Complex type requirements
• Advanced TypeScript users

Our Recommendation

• Most projects: Zod
• Bundle-sensitive: Valibot
• Formik users: Yup
• Performance-critical: ArkType

Explore validation tools in our Tools directory or compare options with our Compare tool.

Sources

• Zod Documentation
• Valibot Documentation
• Yup Documentation
• ArkType Documentation