socket.io, io is not defined (JS Error)

Question

I have just started with socket.io, its giving JS Error on client page

io is not defined

How to fix this ?

Answer 1

<script src="http://cdnjs.cloudflare.com/ajax/libs/socket.io/0.9.16/socket.io.min.js"></script>

this is the latest version of socket.io to be included.

Answer 2

http://socket.io/download/ - the official page for latest cdn.

Answer 3

Wrap your client code on a '$(document).ready()' for jQuery or another library similar function. This way you'll be sure your code runs after the library beeing loaded.

Answer 4

Alternatively you can use the Socket.io CDN:

<script src="https://cdn.socket.io/socket.io-1.0.0.js"></script>

Answer 5

I faced the same problem when using express. Even putting the server:port inside the script would not work.After the server started i would make socket listen to that port, that was mistake i guess.Changing it to below works fine

var app = express();
app.set('port', process.env.PORT || 3000);
var server = http.createServer(app);
var io = require('socket.io').listen(server);
server.listen(app.get('port'));

On Client side I just include the script

 <script src="/socket.io/socket.io.js"></script>

Answer 6

put <script src="http://yournodeserver/socket.io/socket.io.js"></script> into your code