Uploading to imgur API from Javascript canvas

gistfile1.js

function upload() {
  var img = document.getElementById("avatar").toDataURL("image/png").split(',')[1];
  
  $.ajax({
    url: 'https://api.imgur.com/3/image',
    type: 'POST',
    headers: { "Authorization": "Client-ID ***YOUR CLIENT ID***" },
    dataType: 'json',
    data: {
      image: img
    },
    success: function (response) {
      console.log(response);
    },
    error: function (response) {
      console.log(response);
    }
  });
}