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let app = require('express')();
let http = require('http').Server(app);
let io = require('socket.io')(http);

io.on('connection', function(socket){
  console.log("Connected")
  
  socket.on('femiEvent', function(res){
    console.log(res)
  })
})

app.get('/', function(req, res){
  res.sendFile(__dirname + '/index.html');
});


http.listen(3000, function(){
  console.log('listening on *:3000');
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.1.0/socket.io.js"></script>


<h1 id="app">Hi2</h1>

<script>
  var socket = io()
    socket.emit("femiEvent", document.getElementById('app').innerHTML)
</script>