how to use socket.io in nodejs code example

Example 1: how to use of socket io on a route in nodejs

//Using Express 4, in your app.js file you can use
app.set('socketio', io);

//then in your router you can access it like this
router.post('/getRides', function(req, res, next) {
    var io = req.app.get('socketio');

    io.to(//socket.id//).emit("message", data);

    db.rides.find(function(err, docs) {
        res.json(docs);
    });
};

Example 2: socket.io documentation

const socket = new WebSocket('ws://localhost:3000');socket.onopen(() => {  socket.send('Hello!');});socket.onmessage(data => {  console.log(data);});