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NodeJS TCP Sockets

A simple TCP server


// Include Nodejs' net module.
const Net = require('net');
// The port on which the server is listening.
const port = 8080;
// Use net.createServer() in your code. This is just for illustration purpose.
// Create a new TCP server.
const server = new Net.Server();
// The server listens to a socket for a client to make a connection request.
// Think of a socket as an end point.
server.listen(port, function() {
 console.log(`Server listening for connection requests on socket localhost:${port}`.);
});
// When a client requests a connection with the server, the server creates a new
// socket dedicated to that client.
server.on('connection', function(socket) {
 console.log('A new connection has been established.');
 // Now that a TCP connection has been established, the server can send data to
 // the client by writing to its socket.
 socket.write('Hello, client.');
 // The server can also receive data from the client by reading from its socket.
 socket.on('data', function(chunk) {
 console.log(`Data received from client: ${chunk.toString()`.});
 });
 // When the client requests to end the TCP connection with the server, the server
 // ends the connection.
 socket.on('end', function() {
 console.log('Closing connection with the client');
 });
 // Don't forget to catch error, for your own sake.
 socket.on('error', function(err) {
 console.log(`Error: ${err}`);
 });
});


Conclusion

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