How to secure JavaScript code

[lidev]

Hi,

 

I have seen some games lastly in which you can not consult the code from the browser console, When you go to 'Sources' to look at the code it doesn't show anything, I would like to do that in my games too but I don't know how, is there anyone who can help me about this ?

 

Thanks

[Felipe]

You could use closure.

(function (scope) {    // your code goes here.    // if you want to leave something at the global scope    scope.MyGlobalVariable = 'hi';}(window));

[oddskill]

Hi.

 

I guess that must have been Flash games or whatever.

There is no way to secure javascript code if made available for a browser. Only obfuscation is available.

If someone has a diffrent knowledge on that, please let me know,

 

best regards

 

odd

.

[Sir_Everard]

This could have been a nodejs based site where the JavaScript is mostly server side, requiring minimal client side JavaScript. More information on the site you saw this on would help us understand what you encountered

[kemz]

 you can use Jscrambler to  obfuscate(hide)  your  javascript source code.   http://jscrambler.com/en/

[lidev]

Thanks for your suggestions guys,

by 'hiding' I really mean hiding, it doesn't appear in the console/sources, I don't mean the obfuscation.

 

Here is an example of a game in which you can see what I mean, (the js file of the game shows empty):

http://www.zibbo.com/game/puzzle-games/jelly-slice

[Sir_Everard]

It's not hidden, it's just embedded in an iFrame, see here: http://games.softgames.de/jelly-slice/?p=spilgames-zibbo&gp=1&hash=&username=&siteid=161&channelid=21&UID=

 

All it's compressed code:

http://games.softgames.de/assets/softgames-1.1.js

http://assets.sgc.io/assets/api/voyager.js?_=3208581

http://d3tlss08qwqpkt.cloudfront.net/assets/api/voyager_base-da1d578f006ea7565050dfd2c11f9702.js

[Felipe]

The game is running on a different website and zibbo is using an iframe to run the game in their portal. What they are also doing is waiting for ad to be shown so they can load the needed sciprts asynchronously. If you look in the console you can find the softgames domain and see the scripts.

[SolarJS]

JScrambler is a tool which can hit your performance up to 66% !!! Here are 6 reason not to use it:

 

http://www.html5gamedevs.com/topic/5807-best-way-to-hide-javascript-code/page-2#entry65903

 

If you want to protect your code and keep your performance intact I recommend Google Closure Compiler in Simple Mode and after that a obfuscation toolset like Jasob or others. They keep the speed intact.