Node.js script to install dependencies using npm

deps.js

var child_process = require('child_process');

function install(modules, callback) {
	if (modules.length == 0) {
		if (callback) callback(null);
		return;
	}
	var module = modules.shift();
	child_process.exec(
		'npm install ' + module,
		{},
		function(error, stdout, stderr) {
			process.stdout.write(stdout + '\n');
			process.stderr.write(stderr + '\n');
			if (error !== null) {
				if (callback) callback(error);
			}
			else {
				install(modules, callback);
			}
		});
}

/* Example */

install([
	'coffee-script',
	'express'
]);