gistfile1.js

function updateName() {
        uuid = document.getElementById("uuid").value;
		fetch('https://api.mojang.com/user/profiles/' + uuid + '/names', {
      		method: 'GET',
      		mode: 'no-cors'
    	})
    .then(response => response.json())
    .then(result => alert(JSON.stringify(result)))
  });
    }