Javascript frontend with a Javascript backend

Is it possible for a web site?

Javascript to process queries on the sever, Javascript to render the page, Javascript database, Javascript compiler, Javascript editor.

All made in Javascript.

http://nodejs.org/ http://couchdb.apache.org/ JavaScript all the way down until you hit sepples and erlang.

A self hosting JavaScript compiler with a run time as good as V8 might be a good idea. You would then have to write your own database server.