Zod

• To validate the schema and auto-generate the type in order to make sure the type must be correct

import { z } from "zod";

const User = z.object({
  username: z.string(),
});

// validate: if correct return object, else throw error
const user = User.parse({ username: "Ludwig" });

// extract the inferred type
type User = z.infer<typeof User>;
// { username: string }