I think the sessions in Node/Express are helpful when pair properly. For example, Express can use Redis as its session store. This has the benefit of making the

I think the sessions in Node/Express are helpful when pair properly. For example, Express can use Redis as its session store. This has the benefit of making the session cross-cluster populated, while still being fast. Add to this the fact that almost everything in JS is serializable as itself and you get a pretty good replication mechanism.