[nodejs] exception handling middleware

I want to have an application global exception handler.
I have added

app.use(function(err, req, res, next) {
     logger.error(err.message);
     res.status(err.status || 500);
     res.render('error', {
         message: err.message,
         error: {}
     });
});


and in my code, to test this, I throw something like

throw new Error('catch me');


and I never see my middleware catching it.


Thoughts?


Reza