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React Academy · Lesson

Type-Safe Forms & API Response Contracts

Use Zod to infer TypeScript types from schemas and validate both form data and API responses.

Why Type-Safe Data Shapes Matter

Forms and API responses are boundaries where data enters your application from untrusted sources. Zod lets you define schemas that both validate at runtime and infer TypeScript types.

Zod Schema Basics

Define schemas with Zod's fluent API. Use z.infer<typeof schema> to extract the TypeScript type.

import { z } from 'zod';

const UserSchema = z.object({
  id: z.string().uuid(),
  name: z.string().min(1).max(100),
  email: z.string().email(),
  age: z.number().int().min(0).max(150).optional(),
  role: z.enum(['admin', 'user', 'guest']),
});

type User = z.infer<typeof UserSchema>;
// { id: string; name: string; email: string; age?: number; role: 'admin'|'user'|'guest' }

All lessons in this course

  1. Discriminated Unions for Component Variants
  2. Conditional & Mapped Types in React
  3. Polymorphic Components with 'as' Prop
  4. Type-Safe Forms & API Response Contracts
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