JSMin

JSMin by JSMin
Price: Free

JSMin is a filter which removes comments and unnecessary whitespace from JavaScript files. It typically reduces filesize by half, resulting in faster downloads. It also encourages a more expressive programming style because it eliminates the download cost of clean, literate self-documentation. JSMin is a filter that omits or modifies some characters. This does not change the behavior of the program that it is minifying. The result may be harder to debug. It will definitely be harder to read.

JSMin first replaces carriage returns ('\r') with linefeeds ('\n'). It replaces all other control characters (including tab) with spaces. It replaces comments in the // form with linefeeds. It replaces comments in the /* */ form with spaces. All runs of spaces are replaced with a single space. All runs of linefeeds are replaced with a single linefeed. It omits spaces except when a space is preceded and followed by a non-ASCII character or by an ASCII letter or digit. It is more conservative in omitting linefeeds, because linefeeds are sometimes treated as semicolons. A linefeed is not omitted if it precedes a non-ASCII character or an ASCII letter or digit.

JSMin requires, but does not verify, that the character set encoding of the input program is either ASCII or UTF-8. It might not work correctly with other encodings.

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