TypeScript Academy · Lesson

Defining Object Shapes with Interfaces

Use interface to describe object structure.

Welcome

Interfaces describe the shape of objects in TypeScript. They define which properties exist, their types, and whether they are optional or readonly.

Define an interface with the `interface` keyword followed by property names and their types.

interface User {
  id: number;
  name: string;
  email: string;
}
const alice: User = { id: 1, name: 'Alice', email: 'a@b.com' };