getURL.js

const get = url => {
  return new Promise((resolve, reject) => {
    var xhr = new XMLHttpRequest();
    xhr.addEventListener('load', _ => {
      if (xhr.status !== 200) {
        reject(new Error(xhr.statusText));
      }
      resolve(xhr.response);
    });
    
    xhr.open('GET', url);
    xhr.send();
  }
}

get('story.json').then(response => {
  console.log("Success!", response);
}).catch(error => {
  console.error("Failed!", error);
});