This module is inspired by the dhcpd-leases module, however for the DNSMASQ leases file. The dnsmasq.leases file doesn't appear to have a formal specification but several confirmations of the format exist within the dnsmasq-discuss mailing list, so I have opted to used these.

Install the module

npm install --save dnsmasq-leases

const leases = require('dnsmasq-leases');
const fs = require('fs');

let data = fs.readFileSync('/var/lib/misc/dnsmasq.leases', 'utf8');
console.log(leases(data));
/* logs
[
  {
    timestamp: 2016-10-12T07:59:41.510Z,
    mac: '00:00:00:00:00:00',
    ip: '192.168.0.1',
    host: 'dnsmasq',
    id: '*'
  }
]
*/

The module has been tested with a limited set of dnsmasq lease examples. Please feel free to add more.