Zod

ELI5 — The Vibe Check

Zod is your runtime bouncer for TypeScript. TypeScript checks types at build time, but Zod checks them when actual data arrives. API response looks weird? Form data is sus? Zod catches it and tells you exactly what went wrong. Trust but verify.

Real Talk

Zod is a TypeScript-first schema validation library that provides runtime type checking with automatic TypeScript type inference. It enables defining schemas for data validation, parsing, and transformation with a composable, chainable API.

Show Me The Code

const UserSchema = z.object({
  name: z.string().min(2),
  email: z.string().email(),
  age: z.number().min(18)
});
type User = z.infer<typeof UserSchema>;

When You'll Hear This

"Zod at the API boundary catches so many bugs" / "z.infer gives you the TypeScript type for free"