I am a bit new to this , so forgive me if I sound like I dont understand this, I think the encoding is non-deterministic, for instance, there are multiple encodings that can be produced from a source String, does that make decoding impossible ?
Is there a decoder available somewhere ?

hi is there any way to reverse the output back to normal javascript

I'm getting this error http://i.imgur.com/b8pi9.png when running an obfuscated alert. I used the live version you have on your website, entered "alert('spray');" w/o the quotes and hit convert script. I then copied the results into an html file, you can see the top of the html file in the image above (which is actually a 'view source'). It doesn't seem to be a fatal error (it's one of those "Done, but with errors"), however I'm not getting the alert box. However, if I paste that code into the Chrome javascript console, I get the alert, then the console seems to return 'undefined'. I'm running IE8.

Any thoughts?

I ported the code to Ruby and I had this same issue, so I went to test the javascript version and I got the same thing

Just for convenience .

I'm a student,there's a test and one question is all these ()[]{}!+ characters.It's about coding,so I wonder there is any thing can translate ()[]{}!+ into normal javascript code.Thanks!

Chrome has a strict MIME type checking, which prevents files served as text/plain being executed as JS. As such, serving the js from raw.github.com doesn't work.

See: https://plus.google.com/+MikeWest/posts/28f8HS2M7cb

i just Convert alert(1) and run in firefox 3.6 linux 64.

Error: unescaoe is not defined.

it seems unescaoe should be unescape.
what does the matter?