check-ip-address

Test your ip address to see if you're running behind a proxy / firewall or not.

Returns your remote address from os.networkInterfaces() if available, or false if not;

Install & Usage

npm install --save check-ip-address

'use strict';

var checkip = require('check-ip-address');
var service = 'https://api.ipify.org'; // default
//var service = 'https://coolaj86.com/services/whatsmyip'; // another option

checkip.getExternalIp(service).then(function (ip) {
  console.log("Externally accessible network interface, if any:", ip);
  // false - no internal interfaces match the external address
  // '107.23.87.1' - example ip address that is publicly accessible
});

Actual Use Case

'use strict';

var http = require('http')
  , port = process.argv[2] || 3000
  , checkip = require('check-ip-address')
  , server = http.createServer()
  ;

checkip.getExternalIp().then(function (ip) {
  var host = ip || 'localhost'
    , fqdn = ip || 'local.foobar3000.com'
    ;

  function app(req, res) {
    // this 'app' would be a real server such as:
    // require('../server').create(server).then(function (app) { ... });
    res.end(fqdn);
  }
  server.on('request', app);

  server.listen(port, function() {

    console.log('\n', 'Listening on http://' + host + ':' + port, '\n');
    
    if (host !== fqdn) {
      console.log('Test this link in your browser also:');
      console.log('    http://' + fqdn + ':' + port);
    }
    
    console.log('');
  });
});