Comments on entrepreneurial musings: Compressing and Obfuscating JavaScript (with Proto...

An election game? Awesome idea, who thought of tha...

2011-09-07T22:59:42.438-04:00

An election game? Awesome idea, who thought of that?

Dub Turbo Review

Even with one of the most diligent efforts it is o...

2011-06-28T02:26:16.957-04:00

Even with one of the most diligent efforts it is often a task that takes repeated efforts.

Fleas on Humans

DECOMPRESS JAVASCRIPT Is IMPOSSIBLE...

2011-02-08T05:39:11.426-05:00

DECOMPRESS JAVASCRIPT

Is IMPOSSIBLE to hide the compressed code.

A typical JavaScript compressed with /packer/ starts with the following code:

`eval(function(p,a,c,k,e,r)`…
`eval` can simply be replaced by `alert`.

The `eval` function evaluates a string argument that contains JavaScript. In most packers, `eval` is used, followed by `document.write`.

To decompress JavaScript, replace these methods by one of the following:

1. Replace `eval` by `alert` (*Like this:* `alert(function(p,a,c,k,e,r)`… *and open or refresh the html page, the alert will simply print the code in a popup-window*)

2. If the JavaScript appears after the `body` element, you can add a `textarea` like so:

"textarea id="code".../textarea"

Then, replace `eval`(…); by `document.getElementById("code").value=…;`

From both options the first is more simple... Good luck :)

Yep, that was it--I had seen the YUI compressor in...

2011-02-04T12:12:22.144-05:00

Yep, that was it--I had seen the YUI compressor in Pack and assumed it was the actual compressor. Once I put that in it worked--now I just have to track down some other bugs to get this working.

dub turbo

Packer offer the highest compression ratio I have ...

2010-10-09T05:11:53.796-04:00

Packer offer the highest compression ratio I have ever seen for large files and there is even a JavaScript version of the packager so you can pack your scripts into the browser.

I'm surprised that nobody mentioned Google clo...

2010-09-24T03:39:31.822-04:00

I'm surprised that nobody mentioned Google closing compiler. Not limited to reduce / compress analyzed to find and remove unused code, and rewritten for maximum minification.

Dubturbo

@jordi JAWR looks pretty great, I'll have to try i...

2008-06-25T13:43:00.000-04:00

@jordi JAWR looks pretty great, I'll have to try it out sometime. I like that JAWR handles DWR scripts... I've had to hack around the packtag solution I'm using by referencing the DWR scripts via the absolute URL as external files, which works well. Looking forward to trying out JAWR...

I mantain a very similar library called JAWR.
It also allows editing in uncompressed form, and it has the advantage that you don't need to repeat the whole list of scripts you need compressed at every page. Let me know what you think! :-)

Yep, that was it--I had seen the YUI compressor in...

2008-02-05T14:17:00.000-05:00

Did you download the YUICompressor from http://www...

2008-02-02T14:33:00.000-05:00

Did you download the YUICompressor from http://www.julienlecomte.net/yuicompressor/ ? The compressor strategy is included with the pack:tag, but the actual compressor is not. If you did, perhaps it's not on the classpath when deployed? I always deploy my apps as .war files, and I use Netbeans to build the .war for me, but if you're using some other system, make sure the YUICompressor .jar is on the classpath.

Hey,

I was really happy to find your articl...

2008-01-31T16:27:00.000-05:00

Hey,

I was really happy to find your article. I immediately implemented pack using the yui compressor, but when trying to hit my page I got this error:

java.lang.NoClassDefFoundError: org/mozilla/javascript/ErrorReporter

I can see the file JavaScriptErrorReporter.class in the jar, so I'm not sure why it's failing. I'm using version 3.2 of pack, with Tomcat 6 and Java 5.

Ideas?

http://www.compressjavascript.com looks like a nic...

2008-01-29T14:18:00.000-05:00

http://www.compressjavascript.com looks like a nice utility, though I haven't tried it. However, unlike my solution above, it does not allow editing of JavaScript files in uncompressed form with dynamic and automatic compression/obfuscation at deploy-time. Also, it appears to have syntax requirements beyond that of a JavaScript interpreter, again, unlike the above solution. For non-Java environments, though, where the dynamic solution is not available, it could be useful.

You may try an online javascript compressor at htt...

2008-01-29T14:01:00.000-05:00

You may try an online javascript compressor at http://www.compressjavascript.com

Comments on entrepreneurial musings: Compressing and Obfuscating JavaScript (with Proto...

An election game? Awesome idea, who thought of tha...

Even with one of the most diligent efforts it is o...

DECOMPRESS JAVASCRIPT Is IMPOSSIBLE...

Yep, that was it--I had seen the YUI compressor in...

Packer offer the highest compression ratio I have ...

I'm surprised that nobody mentioned Google clo...

@jordi JAWR looks pretty great, I'll have to try i...

I mantain a very similar library called JAWR. It also allows editing in uncompressed form, and it has the advantage that you don't need to repeat the whole list of scripts you need compressed at every page. Let me know what you think! :-)

Yep, that was it--I had seen the YUI compressor in...

Did you download the YUICompressor from http://www...

Hey,I was really happy to find your articl...

http://www.compressjavascript.com looks like a nic...

You may try an online javascript compressor at htt...

I mantain a very similar library called JAWR.
It also allows editing in uncompressed form, and it has the advantage that you don't need to repeat the whole list of scripts you need compressed at every page. Let me know what you think! :-)

Hey,

I was really happy to find your articl...