In nodeJs socket.io on method is unresolved in webstorm

Question

I am learning socket.io in node and i have installed the module using-

npm install socket.io --save

here is my code

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

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

io.on('connection', function(socket){
  console.log('a user connected');
});

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

but webstorm is saying that 'on' is unresolved .. please help

Answer 1

1. Open 'Settings' in WebStorm (Ctrl+Alt+S)
2. Go to 'Languages & Frameworks' → 'JavaScript' → 'Libraries'
3. Press 'Download'
4. Select the libriary 'socket.io'
5. Press 'Download and install'

That's all folks!

Answer 2

Try -

var io = new require('socket.io')(http);

and make sure you are including this script on client side

<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io();
</script>

Answer 3

I did not include this script on client side that is why

<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io();
</script>