udp-client.js

var udp = require('dgram');

// -------------------- udp client ----------------

var buffer = require('buffer');

// creating a client socket
var client = udp.createSocket('udp4');

//buffer msg
var data = Buffer.from('siddheshrane');

client.on('message', function (msg, info) {
  console.log('Data received from server : ' + msg.toString());
  console.log('Received %d bytes from %s:%d\n', msg.length, info.address, info.port);
});

//sending msg
client.send(data, 2222, 'localhost', function (error) {
  if (error) {
    client.close();
  } else {
    console.log('Data sent !!!');
  }
});

var data1 = Buffer.from('hello');
var data2 = Buffer.from('world');

//sending multiple msg
client.send([data1, data2], 2222, 'localhost', function (error) {
  if (error) {
    client.close();
  } else {
    console.log('Data sent !!!');
  }
});