JSON to TypeScript Converter

{
  "user": {
    "id": 12345,
    "username": "johndoe",
    "email": "[email protected]",
    "profile": {
      "firstName": "John",
      "lastName": "Doe",
      "age": 28,
      "isPremium": true
    }
  },
  "posts": [
    {
      "id": 1,
      "title": "First Post",
      "tags": [
        "typescript",
        "development"
      ]
    },
    {
      "id": 2,
      "title": "Second Post",
      "tags": [
        "javascript",
        "coding"
      ]
    }
  ]
}

interface Profile {
  firstName: string;
  lastName: string;
  age: number;
  isPremium: boolean;
}

interface User {
  id: number;
  username: string;
  email: string;
  profile: Profile;
}

interface Post {
  id: number;
  title: string;
  tags: string[];
}

interface RootObject {
  user: User;
  posts: Post[];
}