For javascript, there's been jsbeautifier [1], jsfmt [2], uglify.

JSCS [3] added autofixing a while back for most whitespace rules, and ESLint has just begun autofixing as well [4]

[1] http://jsbeautifier.org/ [2] https://github.com/rdio/jsfmt [3] http://jscs.info/ [4] https://github.com/eslint/eslint/pull/3635