I wanted to keep log of some of the simple scores on one of the game that I was playing in the browser. So I decided to make use of the couchdb. It seems like really mature type of database. Not sure why it is not as much famous as the mongodb. It seems like a good database so far. There are ways to create database in couchdb with Nodejs. So you should definitely check out the integration of the couchdb and the nodejs.
If you have not used nodejs with the couchdb then I suggest you to check it out. It's lot better than pouchdb and redis so far in my opinion. I'd definitely recommend making use of it.
Check couchdb and node library.