const xhr = new XMLHttpRequest();

xhr.open('GET', 'https://www.googleapis.com/discovery/v1/apis');

xhr.onload = () => console.log(JSON.parse(xhr.responseText));

xhr.send();

fetch('https://www.googleapis.com/discovery/v1/apis')

  .then(response => response.json())

  .then(console.log)

axios.get('https://www.googleapis.com/discovery/v1/apis')

  .then((response) => response.json())

  .then(console.log); 

superagent.get('https://www.googleapis.com/discovery/v1/apis')

  .then(res => {

     console.log(res.body);

  });