Tobias Schneider's barcode scanner [1] is a great example for a simple bar code scanner (<100 lines) However, it turned out to be not very accurate in a lot of cases. That's why I ported ExactImage's [2] bardecode [3] to javascript using emscripten [4].

I hope you like it.

[1] https://gist.github.com/tobeytailor/421369 [2] http://www.exactcode.com/site/open_source/exactimage/bardeco... [3] http://manpages.ubuntu.com/manpages/lucid/man1/bardecode.1.h... [4] http://emscripten.org/