qrcode.js

javascript:(function() {  var currentURL = window.location.href;  var qrCodeAPI = 'https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=%27 + encodeURIComponent(currentURL);  var qrCodePopup = window.open(qrCodeAPI, %27QR Code%27, %27width=250,height=250%27);  if (qrCodePopup) {    qrCodePopup.focus();  } else {    alert(%27Please allow pop-ups for this website to generate the QR code.%27);  }})();