NodeJS express auto created app binding to server - node.js

Question

I created an express app in NodeJS using express --view=pug expressapp. It created an app.js file
app.js
var createError = require('http-errors');
...
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
//socket setup
var socket = require('socket.io');
var io = socket(app);
io.on('connection', function(socket) {
console.log('made socket connection')
})
module.exports = app;
at the end I try to bind socket.io to app but it expects to bind to server like so
var server = app.listen(3000, function() {
});
//socket setup
var socket = require('socket.io');
var io = socket(server);
I also use nodemon so I run the app using nodemon expressapp and it runs on port 3000. However I can't find where the auto generated express files have setup the server. Because If i try like this
//socket setup
var socket = require('socket.io');
var server = app.listen(3000, function() {
});
var io = socket(server);
I get an error that port 3000 is already in use (by itself) I changed it to 4000 and it works.
Not ideal, if you know how to connect with port 3000 will appreciate the assist.

Answer 1

You shall find it under the directory bin/www