html5

filer.js is a well-tested wrapper library for the HTML5 Filesystem API, an
API which enables web applications to read and write files and folders to
its own sandboxed filesystem.

Unlike other wrapper libraries [1, 2], filer.js takes a different approach
by reusing familiar UNIX commands (cp, mv, ls) for its API. The goal is to
make the HTML5 API more approachable for developers that have done file I/O
in other languages.

https://github.com/ebidel/filer.js
http://angularjs.org/