jsschools

Object type

Describes the shape of an object by its properties and methods.

Since TS 1.0 Spec ↗

Syntax

{ prop: Type; method(): Type }

Examples

type User = {
  id: number;
  name: string;
  active?: boolean;
  readonly createdAt: Date;
};

function move(p: { x: number; y: number }) {
  return p.x + p.y;
}

Notes

Object type literals list properties with optional (`?`) and `readonly` modifiers, methods, call/construct signatures, and index signatures. TypeScript uses structural typing, so any value with a compatible shape is assignable. Use `type` or `interface` to name reusable shapes.

See also