This a repository full of all kinds of CouchDB + node.js goodies. This is not, however, a CouchDB client library.

To use the changes service:

cd changes node service.js http://localhost:5984

This will start the service, look for any design documents, and start any change listeners you've defined. It also checks every minute for new databases.

To define a new listener in your design doc:

{ ....
"changes":"var sys = require('sys');
 var listener = function (change) {
 sys.puts(JSON.stringify(change));
 }
 exports.listener = listener;",
}