Retrieving a List of network interfaces in node.js (ioctl SIOCGIFCONF)

If you want to list only the name of interfaces :

 Object.keys(os.getNetworkInterfaces())
  // [ 'lo0', 'en0', 'en3', 'awdl0' ]

Update valid as of Node 13.7.0

This has been renamed since this answer was submitted. It is now just networkInterfaces() like this:

require('os').networkInterfaces()

Or probably preferably like this:

import { networkInterfaces } from 'os';

const interfaces = networkInterfaces();

New docs url: https://nodejs.org/docs/latest/api/os.html#os_os_networkinterfaces

Original answer

As of Node.js 0.6.0 you have

require('os').getNetworkInterfaces()

See http://nodejs.org/docs/latest/api/os.html#os.getNetworkInterfaces

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