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Module rjsmin

source code

rJSmin is a javascript minifier written in python.

The minifier is based on the semantics of jsmin.c by Douglas Crockford.

The module is a re-implementation aiming for speed, so it can be used at runtime (rather than during a preprocessing step). Usually it produces the same results as the original jsmin.c. It differs in the following ways:

Since most parts of the logic are handled by the regex engine it's way faster than the original python port of jsmin.c by Baruch Even. The speed factor varies between about 6 and 55 depending on input and python version (it gets faster the more compressed the input already is). Compared to the speed-refactored python port by Dave St.Germain the performance gain is less dramatic but still between 3 and 50 (for huge inputs). See the docs/BENCHMARKS file for details.

rjsmin.c is a reimplementation of in C and speeds it up even more.

Both python 2 and python 3 are supported.

Copyright: Copyright 2011 - 2015 André Malo or his licensors, as applicable


Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Version: 1.0.12

Author: André Malo

jsmin(script, keep_bang_comments=False)
Minify javascript based on jsmin.c by Douglas Crockford.
source code
Function Details

jsmin(script, keep_bang_comments=False)

source code 

Minify javascript based on jsmin.c by Douglas Crockford.

Instead of parsing the stream char by char, it uses a regular expression approach which minifies the whole script with one big substitution regex.

  • script (str) - Script to minify
  • keep_bang_comments (bool) - Keep comments starting with an exclamation mark? (/*!...*/)
Returns: str
Minified script