js.io is a multi-platform package management and module system for JavaScript. js.io modules can be evaluated in a JavaScript runtime (e.g. node.js) or precompiled into a single package for use on the client side.

js.io provides the following:

A module system. Dependency graph that works in the client and the browser. Support and networking libraries that can be used on either platform.

run the js.io repl:

$ jsio

or run a js.io-flavored script:

$ jsio file.js	

or the js.io compiler:

$ jsio-compile