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node-portfinder 
Installation
Installing npm (node package manager)
curl http://npmjs.org/install.sh | sh
Installing node-portfinder
$ [sudo] npm install portfinder
Usage
The portfinder module has a simple interface:
var portfinder = require('portfinder');
portfinder.getPort(function (err, port) {
//
// `port` is guaranteed to be a free port
// in this scope.
//
});
By default portfinder will start searching from 8000. To change this simply set portfinder.basePort.
Run Tests
$ npm test