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);
});

setInterval(() => {
  //sending msg                                                                                   
  client.send(data,2222,'localhost',function(error){
    if(error){
      client.close();
    }else{
      console.log('Data sent !!!');
    }
  });
}, 10)

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 !!!');
  }
});

server.js

var udp = require('dgram');

// --------------------creating a udp server --------------------                                 

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

// emits when any error occurs                                                                    
server.on('error',function(error){
  console.log('Error: ' + error);
  server.close();
});

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

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

  });

});

//emits when socket is ready and listening for datagram msgs                                      
server.on('listening',function(){
  var address = server.address();
  var port = address.port;
  var family = address.family;
  var ipaddr = address.address;
  console.log('Server is listening at port' + port);
  console.log('Server ip :' + ipaddr);
  console.log('Server is IP4/IP6 : ' + family);
});

//emits after the socket is closed using socket.close();                                          
server.on('close',function(){
  console.log('Socket is closed !');
});

server.bind(2222);