Zod v4 - Schema Validation Skill

Zod v4 is a TypeScript-first schema declaration and validation library that provides static type inference, runtime validation, and exceptional performance. Version 4 delivers 14x faster parsing and 66% smaller bundles while maintaining full type safety.

Quick Start

npm install zod@^4.0.0

import * as z from "zod";

// Basic schema creation and validation
const UserSchema = z.object({
  id: z.number().int().positive(),
  email: z.email(),
  username: z.string().min(3).max(20),
  age: z.number().int().min(18).optional(),