z.infer, z.input & z.output in Zod

From the Zod cheat sheet · Type Inference · verified Jul 2026

Use schemas as the single source of truth for runtime and types

typescript

const UserSchema = z.object({
  name: z.string(),
  age: z.number(),
});

type User = z.infer<typeof UserSchema>;
// { name: string; age: number }

💡 z.infer gives you a TypeScript type for free — no need to write interfaces twice

⚡ Use z.input for function parameters and z.output for return types when transforms are involved

📌 Schemas are the single source of truth — change once, types update everywhere

🟢 Pair Zod with @hookform/resolvers/zod for fully typed React Hook Form validation

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