How to make dynamic Socket.IO room selection?

Question

Node.js

Hello.
How can you implement something like a room system?
At the moment there is a similar idea that throws errors in the console:

app.use(express.static(path.join(__dirname, 'public'))+':roomID', function(request, response){
  const roomID = request.params.roomID;
});

Answer 1

I beg your pardon. Doesn't throw errors, just CANNOT GET.