Getting JSON Data from URL

get-json-data-javascript.js

var getJSON = function (url, callback) {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", url, true);
  xhr.responseType = "json";
  xhr.onload = function () {
    var status = xhr.status;
    if (status === 200) {
      callback(null, xhr.response);
    } else {
      callback(status, xhr.response);
    }
  };
  xhr.send();
};

let data = getJSON(
  "http://private-38e18c-uzduotis.apiary-mock.com/config/cash-in",
  function (err, data) {
    console.log(data.max.amount);
  }
);