diff --git a/src/static/js/demo.js b/src/static/js/demo.js
index 2317515..923e9d2 100644
--- a/src/static/js/demo.js
+++ b/src/static/js/demo.js
@@ -1,53 +1,53 @@
-/* eslint strict: 0 */
-/* global jQuery */
+/* eslint-disable */
 
-(function($) {
+;(function($) {
   'use strict';
 
   $('.progress-bar').css('width', '100%');
 
   // POST key form
-  $('#addKey form').submit(e => {
+  $('#addKey form').submit(function(e) {
     e.preventDefault();
     $('#addKey .alert').addClass('hidden');
     $('#addKey .progress').removeClass('hidden');
     $.ajax({
       method: 'POST',
       url: '/api/v1/key',
-      data: JSON.stringify({publicKeyArmored: $('#addKey textarea').val()}),
+      data: JSON.stringify({ publicKeyArmored:$('#addKey textarea').val() }),
       contentType: 'application/json',
-    }).done((data, textStatus, xhr) => {
+    }).done(function(data, textStatus, xhr) {
       if (xhr.status === 304) {
         alert('addKey', 'danger', 'Key already exists!');
       } else {
         alert('addKey', 'success', xhr.responseText);
       }
     })
-    .fail(xhr => {
+    .fail(function(xhr) {
       alert('addKey', 'danger', xhr.responseText);
     });
   });
 
   // DELETE key form
-  $('#removeKey form').submit(e => {
+  $('#removeKey form').submit(function(e) {
     e.preventDefault();
     $('#removeKey .alert').addClass('hidden');
     $('#removeKey .progress').removeClass('hidden');
-    const email = $('#removeKey input[type="email"]').val();
+    var email = $('#removeKey input[type="email"]').val();
     $.ajax({
       method: 'DELETE',
-      url: `/api/v1/key?email=${encodeURIComponent(email)}`
-    }).done((data, textStatus, xhr) => {
+      url: '/api/v1/key?email=' + encodeURIComponent(email)
+    }).done(function(data, textStatus, xhr) {
       alert('removeKey', 'success', xhr.responseText);
     })
-    .fail(xhr => {
+    .fail(function(xhr) {
       alert('removeKey', 'danger', xhr.responseText);
     });
   });
 
   function alert(region, outcome, text) {
-    $(`#${region} .progress`).addClass('hidden');
-    $(`#${region} .alert-${outcome} span`).text(text);
-    $(`#${region} .alert-${outcome}`).removeClass('hidden');
+    $('#' + region + ' .progress').addClass('hidden');
+    $('#' + region + ' .alert-' + outcome + ' span').text(text);
+    $('#' + region + ' .alert-' + outcome).removeClass('hidden');
   }
-}(jQuery));
+
+}(jQuery));
\ No newline at end of file