diff --git a/.eslintrc b/.eslintrc
index fb9e3125..1f7106fa 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -19,6 +19,7 @@ globals:
   it: false
   jsc: false
   jsdom: true
+  kjua: true
 
 # http://eslint.org/docs/rules/
 rules:
diff --git a/.jshintrc b/.jshintrc
index 2eb6bce8..fabd7e6d 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -16,26 +16,31 @@
     "nonew": true,
     "quotmark": "single",
     "singleGroups": true,
-    "strict": "global",
+    "strict": true,
     "undef": true,
     "unused": true,
     "jquery": true,
+    "browser": true,
     "predef": {
-        "after": true,
-        "before": true,
-        "cleanup": true,
-        "console": true,
-        "describe": false,
-        "document": true,
-        "fs": false,
-        "global": true,
-        "exports": true,
-        "it": false,
-        "jsc": false,
-        "jsdom": true,
-        "require": false,
-        "setTimeout": false,
-        "window": true
+      "after": true,
+      "before": true,
+      "cleanup": true,
+      "console": true,
+      "describe": false,
+      "document": true,
+      "fs": false,
+      "global": true,
+      "exports": true,
+      "it": false,
+      "jsc": false,
+      "jsdom": true,
+      "require": false,
+      "setTimeout": false,
+      "window": true
+    },
+    "globals": {
+      "sjcl": true,
+      "DOMPurify": true,
+      "kjua": true
     }
 }
-
diff --git a/js/privatebin.js b/js/privatebin.js
index 197ec58a..a39c38a0 100644
--- a/js/privatebin.js
+++ b/js/privatebin.js
@@ -28,6 +28,7 @@ sjcl.random.startCollectors();
 
 // main application start, called when DOM is fully loaded
 jQuery(document).ready(function() {
+    'use strict';
     // run main controller
     $.PrivateBin.Controller.init();
 });
@@ -331,7 +332,7 @@ jQuery.PrivateBin = (function($, sjcl, Base64, RawDeflate) {
             var usesPlurals = $.isArray(args[0]);
             if (usesPlurals) {
                 // use the first plural form as messageId, otherwise the singular
-                messageId = (args[0].length > 1 ? args[0][1] : args[0][0]);
+                messageId = args[0].length > 1 ? args[0][1] : args[0][0];
             } else {
                 messageId = args[0];
             }
@@ -415,16 +416,16 @@ jQuery.PrivateBin = (function($, sjcl, Base64, RawDeflate) {
                 case 'fr':
                 case 'oc':
                 case 'zh':
-                    return (n > 1 ? 1 : 0);
+                    return n > 1 ? 1 : 0;
                 case 'pl':
-                    return (n === 1 ? 0 : (n % 10 >= 2 && n %10 <=4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2));
+                    return n === 1 ? 0 : (n % 10 >= 2 && n %10 <=4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
                 case 'ru':
-                    return (n % 10 === 1 && n % 100 !== 11 ? 0 : (n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2));
+                    return n % 10 === 1 && n % 100 !== 11 ? 0 : (n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
                 case 'sl':
-                    return (n % 100 === 1 ? 1 : (n % 100 === 2 ? 2 : (n % 100 === 3 || n % 100 === 4 ? 3 : 0)));
+                    return n % 100 === 1 ? 1 : (n % 100 === 2 ? 2 : (n % 100 === 3 || n % 100 === 4 ? 3 : 0));
                 // de, en, es, it, no, pt
                 default:
-                    return (n !== 1 ? 1 : 0);
+                    return n !== 1 ? 1 : 0;
             }
         };
 
@@ -660,7 +661,7 @@ jQuery.PrivateBin = (function($, sjcl, Base64, RawDeflate) {
          */
         me.hasCipherData = function()
         {
-            return (me.getCipherData().length > 0);
+            return me.getCipherData().length > 0;
         };
 
         /**
@@ -831,7 +832,7 @@ jQuery.PrivateBin = (function($, sjcl, Base64, RawDeflate) {
             var viewportTop = $(window).scrollTop();
             var viewportBottom = viewportTop + $(window).height();
 
-            return (elementTop > viewportTop && elementTop < viewportBottom);
+            return elementTop > viewportTop && elementTop < viewportBottom;
         };
 
         /**
@@ -1194,8 +1195,8 @@ jQuery.PrivateBin = (function($, sjcl, Base64, RawDeflate) {
          */
         function sendToShortener()
         {
-            window.location.href = $shortenButton.data('shortener')
-                                   + encodeURIComponent($pasteUrl.attr('href'));
+            window.location.href = $shortenButton.data('shortener') +
+                                   encodeURIComponent($pasteUrl.attr('href'));
         }
 
         /**
@@ -2008,7 +2009,7 @@ jQuery.PrivateBin = (function($, sjcl, Base64, RawDeflate) {
         me.hasAttachment = function()
         {
             var link = $attachmentLink.prop('href');
-            return (typeof link !== 'undefined' && link !== '');
+            return typeof link !== 'undefined' && link !== '';
         };
 
         /**
diff --git a/tpl/bootstrap.php b/tpl/bootstrap.php
index 2be8a766..a8868752 100644
--- a/tpl/bootstrap.php
+++ b/tpl/bootstrap.php
@@ -75,7 +75,7 @@ if ($MARKDOWN):
 <?php
 endif;
 ?>
-		<script type="text/javascript" src="js/privatebin.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-kln7CKhJse+R3qsKw01qJ5nLISVhC/S4T/RRetZbNW3uhheH49NBd8NamOaYcXGQ+CRU8OoN1iD7JLX88Jt0Sg==" crossorigin="anonymous"></script>
+		<script type="text/javascript" src="js/privatebin.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-9HcFkJcGWfvpGHD7tTGYzBtx4TbVfR9z7oujlX2WZ2dYWVv/2QIW5eMSjpvfxUVTJVF+DHD7Ps/80qR8GcQsIg==" crossorigin="anonymous"></script>
 		<!--[if lt IE 10]>
 		<style type="text/css">body {padding-left:60px;padding-right:60px;} #ienotice {display:block;} #oldienotice {display:block;}</style>
 		<![endif]-->
diff --git a/tpl/page.php b/tpl/page.php
index 1c1b37a9..d1e2d906 100644
--- a/tpl/page.php
+++ b/tpl/page.php
@@ -54,7 +54,7 @@ if ($QRCODE):
 <?php
 endif;
 ?>
-		<script type="text/javascript" src="js/privatebin.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-kln7CKhJse+R3qsKw01qJ5nLISVhC/S4T/RRetZbNW3uhheH49NBd8NamOaYcXGQ+CRU8OoN1iD7JLX88Jt0Sg==" crossorigin="anonymous"></script>
+		<script type="text/javascript" src="js/privatebin.js?<?php echo rawurlencode($VERSION); ?>" integrity="sha512-9HcFkJcGWfvpGHD7tTGYzBtx4TbVfR9z7oujlX2WZ2dYWVv/2QIW5eMSjpvfxUVTJVF+DHD7Ps/80qR8GcQsIg==" crossorigin="anonymous"></script>
 		<!--[if lt IE 10]>
 		<style type="text/css">body {padding-left:60px;padding-right:60px;} #ienotice {display:block;} #oldienotice {display:block;}</style>
 		<![endif]-->