diff --git a/package-lock.json b/package-lock.json
index 2a1a527..4551774 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,11 @@
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+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
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@@ -78,6 +154,11 @@
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+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.7.tgz",
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+      "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-1.2.1.tgz",
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+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-1.1.0.tgz",
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+        "whatwg-mimetype": "^2.2.0",
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@@ -131,6 +261,16 @@
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+      "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
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+      "requires": {
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+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-1.0.10.tgz",
+      "integrity": "sha512-huhl3DSWX5LaA7jDtnj3XQdJgWW1wYouNW7N0drGzQa4vEUSVWyeFN+Atx6HP4r5cang6oQytMom6I4yhGJj5g=="
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+      "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
+      "integrity": "sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=",
+      "requires": {
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@@ -211,6 +373,33 @@
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+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-3.1.3.tgz",
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+      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-4.2.0.tgz",
+      "integrity": "sha1-De4/7TH81GlhjOc0IJn8GvoL2xM="
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@@ -253,6 +442,31 @@
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@@ -267,6 +481,21 @@
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+        "combined-stream": "^1.0.6",
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@@ -292,11 +521,33 @@
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@@ -333,6 +592,16 @@
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+    "w3c-xmlserializer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-1.0.1.tgz",
+      "integrity": "sha512-XZGI1OH/OLQr/NaJhhPmzhngwcAnZDLytsvXnRmlYeRkmbb0I7sqFFA22erq4WQR0sUu17ZSQOAV9mFwCqKRNg==",
+      "requires": {
+        "domexception": "^1.0.1",
+        "webidl-conversions": "^4.0.2",
+        "xml-name-validator": "^3.0.0"
+      }
+    },
+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg=="
+    },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "requires": {
+        "iconv-lite": "0.4.24"
+      },
+      "dependencies": {
+        "iconv-lite": {
+          "version": "0.4.24",
+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+          "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
+          "requires": {
+            "safer-buffer": ">= 2.1.2 < 3"
+          }
+        }
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g=="
+    },
+    "whatwg-url": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.0.0.tgz",
+      "integrity": "sha512-37GeVSIJ3kn1JgKyjiYNmSLP1yzbpb29jdmwBSgkD9h40/hyrR/OifpVUndji3tmwGgD8qpw7iQu3RSbCrBpsQ==",
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
+    },
     "ws": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
@@ -627,6 +1303,16 @@
         "ultron": "~1.1.0"
       }
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw=="
+    },
+    "xmlchars": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-1.3.1.tgz",
+      "integrity": "sha512-tGkGJkN8XqCod7OT+EvGYK5Z4SfDQGD30zAa58OcnAa0RRWgzUEK72tkXhsX1FZd+rgnhRxFtmO+ihkp8LHSkw=="
+    },
     "xmlhttprequest-ssl": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
diff --git a/package.json b/package.json
index 49fdc5d..e5c99be 100644
--- a/package.json
+++ b/package.json
@@ -18,9 +18,11 @@
     "lightweight"
   ],
   "dependencies": {
+    "dompurify": "^1.0.10",
     "express": "4.*",
     "formidable": "1.*",
     "fs-extra": "7.*",
+    "jsdom": "^14.0.0",
     "socket.io": "2.*"
   },
   "author": "Cracker0dks",
diff --git a/server.js b/server.js
index fb8765b..9212d22 100644
--- a/server.js
+++ b/server.js
@@ -4,6 +4,12 @@ var accessToken = ""; //Can be set here or as start parameter (node server.js --
 fs = require("fs-extra");
 var express = require('express');
 var formidable = require('formidable'); //form upload processing
+
+const createDOMPurify = require('dompurify'); //Prevent xss
+const { JSDOM } = require('jsdom');
+const window = (new JSDOM('')).window;
+const DOMPurify = createDOMPurify(window);
+
 var s_whiteboard = require("./s_whiteboard.js");
 
 var app = express();
@@ -11,24 +17,24 @@ app.use(express.static(__dirname + '/public'));
 var server = require('http').Server(app);
 server.listen(PORT);
 var io = require('socket.io')(server);
-console.log("Webserver & socketserver running on port:"+PORT);
+console.log("Webserver & socketserver running on port:" + PORT);
 
-if(process.env.accesstoken) {
+if (process.env.accesstoken) {
     accessToken = process.env.accesstoken;
 }
 
-var startArgs = getArgs ();
-if(startArgs["accesstoken"]) {
+var startArgs = getArgs();
+if (startArgs["accesstoken"]) {
     accessToken = startArgs["accesstoken"];
 }
-if(accessToken!=="") {
-    console.log("AccessToken set to: "+accessToken);
+if (accessToken !== "") {
+    console.log("AccessToken set to: " + accessToken);
 }
 
-app.get('/loadwhiteboard', function(req, res) {
+app.get('/loadwhiteboard', function (req, res) {
     var wid = req["query"]["wid"];
     var at = req["query"]["at"]; //accesstoken
-    if(accessToken==="" || accessToken==at) {
+    if (accessToken === "" || accessToken == at) {
         var ret = s_whiteboard.loadStoredData(wid);
         res.send(ret);
         res.end();
@@ -38,27 +44,27 @@ app.get('/loadwhiteboard', function(req, res) {
     }
 });
 
-app.post('/upload', function(req, res) { //File upload
+app.post('/upload', function (req, res) { //File upload
     var form = new formidable.IncomingForm(); //Receive form
     var formData = {
-        files : {},
-        fields : {}
+        files: {},
+        fields: {}
     }
 
-    form.on('file', function(name, file) {
-        formData["files"][file.name] = file;      
+    form.on('file', function (name, file) {
+        formData["files"][file.name] = file;
     });
 
-    form.on('field', function(name, value) {
+    form.on('field', function (name, value) {
         formData["fields"][name] = value;
     });
 
-    form.on('error', function(err) {
-      console.log('File uplaod Error!');
+    form.on('error', function (err) {
+        console.log('File uplaod Error!');
     });
 
-    form.on('end', function() {
-        if(accessToken==="" || accessToken==formData["fields"]["at"]) {
+    form.on('end', function () {
+        if (accessToken === "" || accessToken == formData["fields"]["at"]) {
             progressUploadFormData(formData);
             res.send("done");
         } else {
@@ -78,19 +84,19 @@ function progressUploadFormData(formData) {
 
     var name = fields["name"] || "";
     var date = fields["date"] || (+new Date());
-    var filename = whiteboardId+"_"+date+".png";
+    var filename = whiteboardId + "_" + date + ".png";
 
-    fs.ensureDir("./public/uploads", function(err) {
-        if(err) {
+    fs.ensureDir("./public/uploads", function (err) {
+        if (err) {
             console.log("Could not create upload folder!", err);
             return;
         }
         var imagedata = fields["imagedata"];
-        if(imagedata && imagedata != "") { //Save from base64 data
+        if (imagedata && imagedata != "") { //Save from base64 data
             imagedata = imagedata.replace(/^data:image\/png;base64,/, "").replace(/^data:image\/jpeg;base64,/, "");
             console.log(filename, "uploaded");
-            fs.writeFile('./public/uploads/'+filename, imagedata, 'base64', function(err) {
-                if(err) {
+            fs.writeFile('./public/uploads/' + filename, imagedata, 'base64', function (err) {
+                if (err) {
                     console.log("error", err);
                 }
             });
@@ -98,25 +104,25 @@ function progressUploadFormData(formData) {
     });
 }
 
-io.on('connection', function(socket){
+io.on('connection', function (socket) {
 
     socket.on('disconnect', function () {
         socket.broadcast.emit('refreshUserBadges', null); //Removes old user Badges
     });
 
-    socket.on('drawToWhiteboard', function(content) {
+    socket.on('drawToWhiteboard', function (content) {
         content = escapeAllContentStrings(content);
-        if(accessToken==="" || accessToken==content["at"]) {
+        if (accessToken === "" || accessToken == content["at"]) {
             socket.broadcast.to(content["wid"]).emit('drawToWhiteboard', content); //Send to all users in the room (not own socket)
             s_whiteboard.handleEventsAndData(content); //save whiteboardchanges on the server
         } else {
             socket.emit('wrongAccessToken', true);
-        }     
+        }
     });
 
-    socket.on('joinWhiteboard', function(content) {
+    socket.on('joinWhiteboard', function (content) {
         content = escapeAllContentStrings(content);
-        if(accessToken==="" || accessToken==content["at"]) {
+        if (accessToken === "" || accessToken == content["at"]) {
             socket.join(content["wid"]); //Joins room name=wid
         } else {
             socket.emit('wrongAccessToken', true);
@@ -124,41 +130,41 @@ io.on('connection', function(socket){
     });
 });
 
-//Prevent cross site scripting
+//Prevent cross site scripting (xss)
 function escapeAllContentStrings(content, cnt) {
-    if(!cnt)
+    if (!cnt)
         cnt = 0;
 
-    if(typeof(content)=="string") {
-        return content.replace(/<\/?[^>]+(>|$)/g, "");
+    if (typeof (content) === "string") {
+        return DOMPurify.sanitize(content);
     }
-    for(var i in content) {
-        if(typeof(content[i])=="string") {
-            content[i] = content[i].replace(/<\/?[^>]+(>|$)/g, "");
-        } if(typeof(content[i])=="object" && cnt < 10) {
+    for (var i in content) {
+        if (typeof (content[i]) === "string") {
+            content[i] = DOMPurify.sanitize(content[i]);
+        } if (typeof (content[i]) === "object" && cnt < 10) {
             content[i] = escapeAllContentStrings(content[i], ++cnt);
         }
     }
     return content;
 }
 
-function getArgs () {
+function getArgs() {
     const args = {}
     process.argv
-      .slice(2, process.argv.length)
-      .forEach( arg => {
-        // long arg
-        if (arg.slice(0,2) === '--') {
-          const longArg = arg.split('=')
-          args[longArg[0].slice(2,longArg[0].length)] = longArg[1]
-        }
-       // flags
-        else if (arg[0] === '-') {
-          const flags = arg.slice(1,arg.length).split('')
-          flags.forEach(flag => {
-            args[flag] = true
-          })
-        }
-      })
+        .slice(2, process.argv.length)
+        .forEach(arg => {
+            // long arg
+            if (arg.slice(0, 2) === '--') {
+                const longArg = arg.split('=')
+                args[longArg[0].slice(2, longArg[0].length)] = longArg[1]
+            }
+            // flags
+            else if (arg[0] === '-') {
+                const flags = arg.slice(1, arg.length).split('')
+                flags.forEach(flag => {
+                    args[flag] = true
+                })
+            }
+        })
     return args
-  }
\ No newline at end of file
+}
\ No newline at end of file