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Asked: 2026-05-27T21:08:51+00:00

I am trying to understand JavaScript minification and compression processes and have couple of

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I am trying to understand JavaScript minification and compression processes and have couple of questions on these:

  1. Since minification makes the code difficult to debug, is it possible to do on-demand de-minification on client-side to cover-up for cases where you actually need to debug and investigate something on the website?
  2. I remember reading somewhere that one can enable compression of all resources (like images, CSS, JavaScript etc.) by setting some options in the Apache Web Server. Is there any difference in the JavaScript compression done at Apache level and, the one done using tools like YUI Compressor?

Can someone help me know the above?

The kind-of cases where I would actually need to de-minify my JavaScript files is let’s say a JavaScript error happened at line no. X. With a minified files it would be very tough to know which block of code caused that error in production as the lines are all wrapped up in a minified file. How do you guys investigate and debug in such circumstances? Another user also mentioned this debugging problem in Packed/minified javascript failing in IE6 – how to debug? questions (slightly specific to IE6 though).

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  1. Editorial Team

    Since minification makes the code difficult to debug, is it possible
    to do on-demand de-minification on client-side to cover-up for cases
    where you actually need to debug and investigate something on the
    website?

    Sort of. Minified javascript has the same structure, it just does things like delete extra spaces and shorten variable names. So you can easily make the code readable again, either manually or with a script, but you can’t recover variable names, so the code will still be harder to work with. So, if you have the original code, definitely don’t get rid of it. Save the minified code separately.

    I remember reading somewhere that one can enable compression of all
    resources (like images, css, javascript etc.) by setting some options
    in the Apache Web Server.

    Yes, it’s called gzip compression. It’s not unique to apache, but you would need to configure your server to enable it.

    Is there any difference in the javascript compression done at Apache
    level and, the one done using tools like YUI Compressor?

    Yes. YUI compressor is a minifier – the output is valid javascript. Server-side compression is more analogous to zipping a file – the browser must decode it before it can be used. Using the two together would yield the smallest filesize.

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