UglifyCSS is a port of YUI Compressor to NodeJS for its CSS part. Its name is a reference to the awesome UglifyJS but UglifyCSS is not a CSS parser. Like YUI CSS Compressor, it applies many regexp replacements. Note that a port to JavaScript is also available in the YUI Compressor repository.

UglifyCSS passes successfully the test suite of YUI compressor CSS.

For a command line usage:

$ npm install uglifycss -g

For API usage:

$ npm install uglifycss

From Github:

$ git clone git://github.com/fmarcia/UglifyCSS.git

$ uglifycss [options] css1 [css2] [...] > output

Options:

• --max-line-len n adds a newline (approx.) every n characters; 0 means no newline and is the default value
• --expand-vars expands variables; by default, @variables blocks are preserved and var(x)s are not expanded
• --ugly-comments removes newlines within preserved comments; by default, newlines are preserved
• --cute-comments preserves newlines within and around preserved comments

2 functions are provided:

• processString( content, options ) to process a given string
• processFiles( [ filename1, ... ], options ) to process the concatenation of given files

Options are identical to the command line:

• <int> maxLineLen for --max-line-len n
• <bool> expandVars for --expand-vars
• <bool> uglyComments for --ugly-comments
• <bool> cuteComments for --cute-comments

Both functions return uglified css.

var uglifycss = require('uglifycss');

var uglified = uglifycss.processFile(
    [ 'file1', 'file2' ],
    { maxLineLen: 500, expandVars: true }
);

console.log(uglified);

See also test.js.

UglifyCSS is MIT licensed.