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  $ [sudo] npm install portfinder
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.
    //
  });
Or with promise (if Promise are supported) :
  const portfinder = require('portfinder');
  portfinder.getPortPromise()
    .then((port) => {
        //
        // `port` is guaranteed to be a free port
        // in this scope.
        //
    })
    .catch((err) => {
        //
        // Could not get a free port, `err` contains the reason.
        //
    });
If portfinder.getPortPromise() is called on a Node version without Promise (<4), it will throw an Error unless Bluebird or any Promise pollyfill is used.
By default portfinder will start searching from 8000. To change this simply set portfinder.basePort.
  $ npm test