Best JavaScript compressor

Question

What is the the best JavaScript compressor available  I m looking for a tool that    is easy to use has a high compression rate Produce reliable end results  doesn t mess up the code

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I use ShrinkSafe from the Dojo project - it is exceptional because it actually uses a JavaScript interpreter  Rhino  to deal with finding symbols in the code and understanding their scope  etc  which helps to ensure that the code will work when it comes out the other end  as opposed to a lot of compression tools which use regex to do the same  which is not as reliable    I actually have an MSBuild task in a Web Deployment Project in my current Visual Studio solution that runs a script which in turn runs all of the solution s JS files through ShrinkSafe before we deploy and it works quite well   EDIT  By the way   best  is open to debate  since the criteria for  best  will vary depending on the needs of the project  Personally  I think ShrinkSafe is a good balance  for some people that think smallest size    best  it will be insufficient   EDIT  It is worth noting that the YUI compressor also uses Rhino

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Js Crush is a good compressor to use after you have minified

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Revisiting this question a few years later  UglifyJS  seems to be the best option as of now   As stated below  it runs on the NodeJS platform  but can be easily modified to run on any JavaScript engine   --- Old answer below---  Google released Closure Compiler which seems to be generating the smallest files so far as seen here and here  Previous to that the various options  were as follow   Basically Packer does a better job at initial compression   but if you are going to gzip the files before sending on the wire  which you should be doing  YUI Compressor gets the smallest final size   The tests were done on jQuery code btw    Original jQuery library 62 885 bytes   19 758 bytes after gzip jQuery minified with JSMin 36 391 bytes   11 541 bytes after gzip jQuery minified with Packer 21 557 bytes   11 119 bytes after gzip jQuery minified with the YUI Compressor 31 822 bytes    10 818 bytes after gzip    daniel james mentions in the comment compressorrater which shows Packer  leading the chart in best compression  so I guess ymmv

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I recently released UglifyJS  a JavaScript compressor which is written in JavaScript  runs on the NodeJS Node js platform  but it can be easily modified to run on any JavaScript engine  since it doesn t need any Node js internals    It s a lot faster than both YUI Compressor and Google Closure  it compresses better than YUI on all scripts I tested it on  and it s safer than Closure  knows to deal with  eval  or  with     Other than whitespace removal  UglifyJS also does the following    changes local variable names  usually to single characters  joins consecutive var declarations avoids inserting any unneeded brackets  parens and semicolons optimizes IFs  removes  else  when it detects that it s not needed  transforms IFs into the  amp  amp      or     operators when possible  etc    transforms foo  bar   into foo bar where possible removes quotes from keys in object literals  where possible resolves simple expressions when this leads to smaller code  1 3 4     13    PS  Oh  it can  beautify  as well   -

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JSMin is another one

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KJScompress  http   opensource seznam cz KJScompress index html     Kjscompress csskompress is set of two   applications  kjscompress a   csscompress  to remove non-significant   whitespaces and comments from files   containing JavaScript and CSS  Both   are command-line applications for   GNU Linux operating system

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Here s the source code of an HttpHandler which does that  maybe it ll help you

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bananascript com used to give me best results

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YUI Compressor is the way to go  It has a great compression rate  is well tested and is in use among many top sites  and  well  personally recommended by me   I ve used it for my projects without a single JavaScript error or hiccup   And it has nice documentation   I ve never used its CSS compression capabilities  but they exist as well  CSS compression works just as well   Note  Although Dean Edwards s  packer  achieves a better compression rate than YUI Compressor  I ran into a few JavaScript errors when using it

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Try JSMin  got C   Java  C and other ports and readily available too

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In searching silver bullet  found this   question  For Ruby on Rails   http   github com sstephenson sprockets

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If you use Packer  just go far the  shrink variables  option and gzip the resulting code  The base62 option is only for if your server cannot send gzipped files  Packer with  shrink vars  achieves better compression the YUI  but can introduce bugs if you ve skipped a semicolon somewhere   base62 is basically a poor man s gzip  which is why gzipping base62-ed code gives you bigger files than gzipping shrink-var-ed code

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Here is a YUI compressor script  Byuic  that finds all the js and css down a path and compresses   optionally  obfuscates them   Nice to integrate into a build process

[javascript] Best JavaScript compressor

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