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;",
}