Flash messages passport-local-mongoose
Figured out how to work the flash messages. Seems like this should do it.
router.get('/login', function(req, res) { res.render('login', { user : req.user, error : req.flash('error') });});router.post('/login', passport.authenticate('local', { successRedirect : '/dashboard', failureRedirect : '/login', failureFlash : { type: 'error', message: 'Invalid username or password.' }}));