Generic interfaces in TypeScript

generic-interface.ts

interface HttpResponse<T> {
  code: number;
  data: T;
}

interface ResponseData {
  completed: boolean;
  id: number;
  title: string;
  userId: number;
}

async function getJson<T>(url: string): Promise<HttpResponse<T>> {
  const response = await fetch(url);
  const data: T = await response.json();
  return {
    code: response.status,
    data,
  };
}

(async () => {
  const response = await getJson<ResponseData>('https://jsonplaceholder.typicode.com/todos/1');
  console.log(response.code, response.data.title);
})();