The Mojito framework is also a good way for Yahoo to extend the reach of its APIs. It only takes a few lines of code to issue a call written in the Yahoo Query Language (YQL), the lingua franca for accessing Web databases like Flickr. The other parts of the Yahoo empire, including Yahoo Maps and Yahoo News, take the same style query. If you rely on any of these APIs, you'll be even more interested in Mojito.
There are still some limitations. I wish Mojito had some coupling with databases because that's what many developers are going to want to do. Node frameworks such as RailwayJS and Locomotive offer Rails-like connections to traditional databases. If you want a quick CRUD scaffolding to create, update, or delete rows in the database, one command can build them for you.
Web apps without SQLThe Mojito documentation on data access talks about cookies and Yahoo Query Language, not SQL or NoSQL. The counter-SQL argument is that the data should live in its own realm in a JSON-compatible server that takes RESTful queries. The Rails-like integration is too much, and it shackles the developer. Leaving the database connection out of Mojito frees it.