Zod — TypeScript-First Schema Validation

Core Features

Type Inference from Schema

const Schema = z.object({ name: z.string(), age: z.number() });
type T = z.infer<typeof Schema>; // { name: string; age: number }

API Validation

const body = CreatePostSchema.parse(await req.json());

AI SDK Integration

const { object } = await generateObject({
  model: anthropic("claude-sonnet-4-20250514"),
  schema: z.object({ summary: z.string(), keywords: z.array(z.string()) }),
  prompt: "Analyze...",
});

Key Stats

• 35,000+ GitHub stars
• Zero dependencies, 12KB
• Used by tRPC, AI SDK, React Hook Form

FAQ

Q: What is Zod? A: TypeScript-first schema library providing both compile-time type inference and runtime validation from a single schema definition.

Q: Is Zod free? A: Yes, MIT license.