The data should be under the "frames" tab in Chrome devtools.
If you can't get that to work, you can try fiddler2: http://www.codeproject.com/Articles/718660/Debug-Inspect-WebSocket-traffic-with-Fiddler
Question
How can I monitor the data that is being transmitted to and from my javascript client? I've tried using Google Chrome Developer Tools, but under Network tab when I select the web socket I can't see exact data that is being transmitted.
La solution
The data should be under the "frames" tab in Chrome devtools.
If you can't get that to work, you can try fiddler2: http://www.codeproject.com/Articles/718660/Debug-Inspect-WebSocket-traffic-with-Fiddler