Fetch with vanila javascript

class HttpClient {
  constructor(options = {}) {
    this._baseURL = options.baseURL || "";
  }

  async _fetchJSON(endpoint, options = {}) {
    const res = await fetch(this._baseURL + endpoint, {
      ...options,
    });

    if (!res.ok) throw new Error(res.statusText);

    if (options.parseResponse !== false && res.status !== 204)
      return res.json();

    return undefined;
  }
  get(endpoint, options = {}) {
    return this._fetchJSON(endpoint, {
      ...options,
      method: "GET",
    });
  }
}

class ApiClient extends HttpClient {
  constructor(baseURL) {
    super({
      baseURL,
    });
  }

  get users() {
    return {
      get: () => this.get("/users"),
    };
  }
}


(function () {
  const client = new ApiClient("https://www.mockachino.com/a71b232c-218e-4d",);

  async function app() {
    try {
      const users = await client.users.get();
      // Aca haces lo que quieras con la variable users.
    } catch (err) {
      console.log(err);
    }
  }
  app();
})();