BPI Call For Bitcoin Price in Words

bpi_call.js

function bitcoinPrice() {
  var xmlhttp = new XMLHttpRequest();
    var url = "https://api.coindesk.com/v1/bpi/currentprice.json";

    xmlhttp.onreadystatechange = function() {
      if (this.readyState == 4  &&  this.status == 200) {
        var json = JSON.parse(this.responseText);
        parseJson(json);
      }		
    };

  xmlhttp.open("GET", url, true);
  xmlhttp.send();
}