A brainfuck minifier written in JavaScript

brnfckr, a brainfuck minifier written in JavaScript

For an online demo, see

Feel free to fork if you see possible improvements!

In a browser:

<script src="brnfckr.js"></script>

Via npm:

npm install brnfckr

In Narwhal, Node.js, and RingoJS:

var brnfckr = require('brnfckr');

In Rhino:


Using an AMD loader like RequireJS:

    'paths': {
      'brnfckr': 'path/to/brnfckr'
  function(brnfckr) {

Usage example:

var code = 'lol . wat + heh [ huh . hah + oh ] yay';
brnfckr.minify(code); // '.+[.+]' 

To use the brnfckr binary in your shell, simply install brnfckr globally using npm:

npm install -g brnfckr

After that you will be able to minify brainfuck programs from the command line:

$ brnfckr -c '.+[.+] prints out all ASCII characters'
$ brnfckr -f foo.b

See brnfckr --help for the full list of options.

brnfckr has been tested in at least Chrome 27, Firefox 3-19, Safari 4-6, Opera 10-12, IE 6-10, Node.js v0.10.0, Narwhal 0.3.2, RingoJS 0.8-0.9, and Rhino 1.7RC4.

After cloning this repository, run npm install to install the dependencies needed for brnfckr development and testing. You may want to install Istanbul globally using npm install istanbul -g.

Once that’s done, you can run the unit tests in Node using npm test or node tests/tests.js. To run the tests in Rhino, Ringo, Narwhal, and web browsers as well, use grunt test.

To generate the code coverage report, use grunt cover.

Mathias Bynens

brnfckr is dual licensed under the MIT and GPL licenses.