WWW to Sandbox

bookmarklet.js

(function() {
  var currentLocation = location.href;
  var currentLocationHasWww = currentLocation.indexOf('www.') !== -1;
  var searchValue = currentLocationHasWww ? 'www.' : 'sandbox.';
  var replacement = currentLocationHasWww ? 'sandbox.' : 'www.';

  window.location = location.href.replace(searchValue, replacement);
})();

bookmarklet.json

{
  "name": "Toggle Sandbox",
  "description": "Toggle between www. and sandbox. subdomains"
}

bookmarklet.min.js

javascript:(function()%7B!function()%7Bvar%20w%3D-1!%3D%3Dlocation.href.indexOf(%22www.%22)%2Co%3Dw%3F%22www.%22%3A%22sandbox.%22%2Cn%3Dw%3F%22sandbox.%22%3A%22www.%22%3Bwindow.location%3Dlocation.href.replace(o%2Cn)%7D()%7D)()