Get the MAC address of a local system. This can be used to ID systems on your network. MAC addresses can be spoofed but are not in most cases and are static unless tampered with so it makes a better ID than a client's IP address.

getlocalmac.js

/*
Get the MAC address of a local system.
This can be used to ID systems on your network.
MAC addresses can be spoofed but are not in most cases
and are static unless tampered with so it makes a better ID than a client's IP address.
*/

const getmac = require('getmac'); //https://www.npmjs.com/package/getmac

const callMac = () =>{
	return getmac.default(); //You can also do getmac('eth0') for a specific inteface
}

console.log(callMac());