node js web how to use socket io 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: create a web server node js w socket.io

var app = require('express')();
var http = require('http').createServer(app);
var io = require('socket.io')(http);

app.get('/', (req, res) => {
  // Ran when a GET request to path '/'
  res.sendFile(__dirname + '/index.html');
});

io.on('connection', (socket) => {
  // Ran when a socket connected
});

http.listen(3000, () => {
  // Ran when server is ready to take requestes
});