app.js

// var favProvider = new FavProvider('localhost', 27017);
var favProvider = new FavProvider();
var userProvider = new UserProvider();

function loadUser(req, res, next) {
    console.log('loadUser!');
    var name = 'sivy';
    // You would fetch your user from the db
    userProvider.findByName(name, function(error, user){
        if (user) {
            console.log(sys.inspect(user));
            req.user = user;
            next();
        } else {
            console.log('error!');
            next(new Error('Failed to load user ' + name));
        }
    });
}

// Routes

app.get('/', loadUser, function(req, res){
    console.log(sys.inspect(req.user));
    favProvider.findAll( function (error, faves) {
        var ctx = { title: "Faves!", faves: faves };
        loader.load('index.html', function (error, t) {
           t.render(ctx, function (error, result) {
                res.send(result);
                res.end();
            });
        });
    });
});

output.txt

# request to localhost:3000/

loadUser!
{ username: 'sivy'
, password_hash: '098f6bcd4621d373cade4e832627b4f6'
, reminder: 'test'
, _id: 1
, dateCreated: Mon, 18 Oct 2010 05:22:46 GMT
}