socket.io: disconnect event isn't fired

Question

I have made a simple realtime visitor counter.

You can download it from this repository.

What happens is that disconnect event (even after browser closing) on se

Answer 1

Just in case anyone else made this silly mistake: make sure that any socket middleware you've defined calls next() at the end, or else no other socket handlers will run.

// make sure to call next() at the end or...
io.use(function (socket, next) {
    console.log(socket.id, "connection middleware");
    next(); // don't forget this!
});

// ...none of the following will run:

io.use(function (socket, next) {
    console.log(socket.id, "second middleware");
    next(); // don't forget this either!
});

io.on("connection", function (socket) {
    console.log(socket.id, "connection event");
    socket.once("disconnect", function () {
        console.log(socket.id, "disconnected");
    });
});