To add to that: I also think that these days you will need to have some sort of JS framework on top of your server stack. Angular and Ember are bot nice to work with, React would be something I'd look into next time.

In this context (Restful JSON or XML from the server, JS client consuming it) Go again makes a great choice, as it's coming with great JSON and XML capabilities that make it easy to marshal/unmarshal into GO types.