Introduction

Vex is an ultra-fast schema validation library for TypeScript. It's designed with pure functional principles, delivering exceptional performance with zero overhead.

Why Vex?

lucide:zap

Lightning Fast

12x faster than Zod, 6x faster than Valibot. Benchmarked with real-world schemas.

lucide:feather

Zero Overhead

Validators are constants, not factory functions. No allocation on every call.

lucide:shield-check

Type Safe

Full TypeScript inference with accurate types. No manual type annotations needed.

lucide:trees

Tree Shakeable

Import only what you need. Dead code elimination works perfectly.

Quick Start

npm install @sylphx/vex

import { str, num, object, email, int, positive, safeParse } from '@sylphx/vex'

const userSchema = object({
  name: str(),
  email: str(email),
  age: num(int, positive),
})

// Throws on error
const user = userSchema(data)

// Or use safeParse for result objects
const result = safeParse(userSchema)(data)
if (result.success) {
  console.log(result.data)
} else {
  console.log(result.error)
}

Pure Functional Design

Unlike other validation libraries, Vex uses a pure functional approach:

// Vex - validators are constants, zero allocation
str                  // constant
str(email)           // compose with constraints

// Others - allocates on every call
z.string().email()   // Zod
v.string()           // Valibot

This design eliminates runtime overhead and enables maximum tree-shaking.