open-port-host

Find a number of open ports in a range by host name.

Example:

const findPortHost = require('find-port-host');
 
const options = {
  start: 8000,
  end: 8100,
  host: 'localhost',
  count: 2
};
 
findPortHost(options)
  .then(reserved => {
    console.log(`Found ports and reserved the following:`);
    console.log(reserved);
   		// Outputs the following. 
        // [ { port: 8002,
        //     server:
        //      Server {
        //        domain: null,
        //        _events: [Object],
        //        _eventsCount: 1,
        //        _maxListeners: undefined,
        //        _connections: 0,
        //        _handle: [Object],
        //        _usingSlaves: false,
        //        _slaves: [],
        //        _unref: false,
        //        allowHalfOpen: false,
        //        pauseOnConnect: false,
        //        _connectionKey: '4:127.0.0.1:8002' } },
        //   { port: 8003,
        //     server:
        //      Server {
        //        domain: null,
        //        _events: [Object],
        //        _eventsCount: 1,
        //        _maxListeners: undefined,
        //        _connections: 0,
        //        _handle: [Object],
        //        _usingSlaves: false,
        //        _slaves: [],
        //        _unref: false,
        //        allowHalfOpen: false,
        //        pauseOnConnect: false,
        //        _connectionKey: '4:127.0.0.1:8003' } } ]
 
  })
  .catch(err => {
    throw new Error(err);
  });

These ports are now closed (reserved), and passed back. To use the reserved addresses:

findPortHost(options)
  .then(reserved => {
    reserved[0].server.once('close', () => {
        httpServer.listen(reserved[0].port, options.host);
    });
 
    reservedBrowserSyncAddress.server.close();
});