Zod Schema Validation

import { z } from 'zod';

const UserSchema = z.object({
  id: z.number(),
  name: z.string().min(2).max(50),
  email: z.string().email(),
  age: z.number().min(18).optional(),
  role: z.enum(['admin', 'user', 'guest']),
  createdAt: z.string().datetime(),
});

type User = z.infer<typeof UserSchema>;

// Validation
const result = UserSchema.safeParse(data);
if (result.success) {
  console.log(result.data); // Typed as User
} else {
  console.error(result.error.issues);
}

const CreateUserSchema = UserSchema.omit({ id: true, createdAt: true });
const UpdateUserSchema = CreateUserSchema.partial();

// In Express/NestJS handler
const validated = CreateUserSchema.parse(req.body); // Throws on invalid