JSON → TypeScript

Turn any JSON sample into TypeScript interfaces, inferring types and nested shapes automatically.

Root name

JSON

TypeScript

export interface Root {
  id: number;
  name: string;
  active: boolean;
  roles: string[];
  profile: Profile;
}

export interface Profile {
  city: string;
  since: number;
}

Infers types from your sample, including nested objects, arrays, mixed unions and optional keys (when an array of objects has inconsistent fields). Runs entirely in your browser.