exception handling middleware

[Reza Razavipour]

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

[Ryan Schmidt]

If you're using express version 4 or later, make sure you app.use your error handler *after* you've defined all your normal routes. Other than that, I'm not sure; show us your code.

[Jimb Esser]

That will only catch exceptions thrown by synchronous middleware/handlers, if you're doing anything asynchronous, Express is not going to catch it.  Try express-domain-middleware to use domains to catch all exceptions relative to a request and have them passed to your Express error handler.