Lock or compress javascript .js files

Hey -

Several times I've come across .js files that when I tried to open them they said they were compressed archive or something along those lines and could not be opened.

I have a javascript file I would like to lock in such a way.

Any ideas?

Thanks & Happy Holidays!

 

I am interested too. Any updates on this?

 

you can't lock js file
all you can do is obfuscate and make it hard to read or use.

There many js obfuscators some of them are open source

I use one from
saltstorm.net

 

Thanks locdev

Is it the best obfuscator? (saltstorm.net)

 

No I don't think it is the best but good to start with.

 

encrypt/encode it, by soft or by here

 

Good tool; thanks for the link temp2; rep added

 

I normally use YUI compressor for compressing my javascripts - more information here

 

Packer is a well known one. http://dean.edwards.name/packer/

This uses document.write, its very easy to bypass.

 

Thanks for all the posts. Very helpful. Anyone know why some .js files say they are compressed archives and can't be opened?

 

I'm curious whether the compressed js file is decompressed in the browser's cache. It seems to be used for transport across the network.

 

What do you mean?

@wdstuff54:

Got an example?

 

I was wondering if browsers had built in decoding mechanisms to read compressed/obfuscated text or it was just rendered as the original code once it was rendered into cache. Or does javascript have a built-in decrypting mechanism similar to the way an MD5 hash works.

 

Obfuscated text is just obfuscated for the human eye, to the computer its all the same.

 

actually you can compress js files with gzip but it doesn't chnages or hides file contents