index2.js

var packet = require('dns-packet')
var axios = require('axios')

let buf = packet.encode({
    type: 'query',
    id: 1,
    flags: packet.RECURSION_DESIRED,
    questions: [{
      type: 'TXT',
      class: 'IN',
      name: '_ens.ethlab.xyz'
    }],
    additionals: [{
      type: 'OPT',
      name: '.',
      udpPayloadSize: 4096,
      flags: packet.DNSSEC_OK
    }]
  })


let response = axios.get('https://cloudflare-dns.com/dns-query?ct=application/dns-udpwireformat&dns=' + buf.toString('base64'), {
  responseType:'arraybuffer'
})
.then(function (response) {
    var decoded = packet.decode(response.data);
    console.log('decoded!');
    console.log(response.data);
    console.log(decoded);
  })
  .catch(function (error) {
    console.log(error);
  });

//   npm install https://github.com/Arachnid/dns-packet --save