Retrieve the first Local IPv4 from the network interfaces

getLocalIP.js

const os = require('os');

export default function getLocalIP() {
  const ifaces = os.networkInterfaces();

  const ifnames = Object.keys(ifaces);
  for (let i = 0; i < ifnames.length; i += 1) {
    const aliases = ifaces[ifnames[i]];
    for (let j = 0; j < aliases.length; j += 1) {
      const iface = aliases[j];
      if (iface.family === 'IPv4' && !iface.internal) {
        // Return the first ip address found
        return iface.address;
      }
    }
  }

  return null;
}