Find IP address in node

node-ip.js

var getIpAddress = function (interfaces) {
  'use strict';

  var ip    = [],
      iface = null;

  // loop through each interface in the interfaces object
  for (iface in interfaces) {

    // loop through each of the objects in the iface array
    interfaces[iface].forEach(function (i) {

      // only keep track of non-internal IPv4 addresses
      if(i.family === 'IPv4' && !i.internal) {
        ip.push(i);
      }
    });
  }
  // warn if multiple matches were found
  if (ip.length > 1) {
    console.warn('Multiple IP addresses found. Returning only the first one.');
  }

  return ip[0].address;
};

// usage
getIpAddress(require('os').networkInterfaces());