TCP Server + Web Server in same application

  

Is it possible to create a TCP Server that will handle the connection with the Client together with a Web Server using express that will have functions like start, stop and restart of the tcp server?

Yes, it is possible. For this you need to initialize a TCP listener:

var net = require('net');

var server = net.createServer();  
server.on('connection', handleConnection);

server.listen(9000, function() {  
  console.log('server listening to %j', server.address());
});

function handleConnection(conn) {  
  // [...]
}

(Partial example of link )

  

2nd If possible, should I do this?

It will depend exclusively on your modeling. You may be wanting to write a compact solution where listeners HTTP + TCP may coexist - or a separate implementation by services.

  

3rd Is there an ideal structure for the folders and files for a tcp server? Can I apply the MVC concept?

Again, the answer depends on your modeling. I confess I have some difficulty in viewing a folder template for a TCP solution, since we are talking about a stream . If you're referring to classes, here's another one.

When to the MVC model, yes, there are several NodeJS modules that adopt this model. Since net.createServer() has to do with state maintenance, I would say yes, the controller layer would be a good candidate to host the connection control features.