[bryanlarsen]

But neither koa.js nor express.js do websockets. You're holding up a site that would probably be simpler without both koa and express as an example to say that it doesn't make much of a difference whether you choose koa.js or express.js.

[jkarneges]

We've built a pretty cool library for Express that makes it easy to do WebSocket stuff through Pushpin (a proxy server). http://blog.fanout.io/2015/03/09/stateless-websockets-with-e...

Not that this was covered in the article, but it would be a reason to choose Express as the backend. It would be cool to build something similar for Koa though.