Node.js UDP / Dgram Server and Client

const dgram  = require('dgram');

// Server

const server = dgram.createSocket('udp4');

server.on('listening', function () {
    console.log('Server listening: ' + JSON.stringify(server.address()));
});

server.on('message', function (message, rinfo) {
    console.log('Server got message: "' + message + '" from: ' + rinfo.address + ':' + rinfo.port);
    server.send(message, 0, rinfo.size, rinfo.port, rinfo.address, function (error) {
        if (error) {throw error;}
        server.close();
    });
});

server.on('close', function () {
    console.log('Server closed');
});

server.on('error', function (error) {
    console.log('Server error: ' + error.stack);
    server.close();
});

server.bind(8080, '127.0.0.1', function () {
    console.log('Datagram server started at 127.0.0.1:8080');
});

// Client

const client = dgram.createSocket('udp4');

client.on('message', function (message, rinfo) {
    console.log('Client got message: "' + message + '" from: ' + rinfo.address + ':' + rinfo.port);
    client.close();
});

client.on('close', function () {
    console.log('Client closed');
});

client.on('error', function (error) {
    console.log('Client error: ' + error.stack);
    client.close();
});

client.send([Buffer.from('Some bytes.'), Buffer.from(' And another bytes.')], 8080, '127.0.0.1', function (error) {
    if (error) {throw error;}
});