Error handling in Node.js + Express using promises
I would create middleware to handle errors. Using next() for 404s. and next(err) for other errors.
app.get('/xxx/:id', function(req, res, next) { Xxx.findById(req.params.id).exec() .then(function(xxx) { if (xxx == null) return next(); // Not found return res.send('Found xxx '+request.params.id); }) .then(null, function(err) { return next(err); });});404 handler
app.use(function(req, res) { return res.send('404');});Error handler
app.use(function(err, req, res) { switch (err.name) { case 'CastError': res.status(400); // Bad Request return res.send('400'); default: res.status(500); // Internal server error return res.send('500'); }});You can improve upon this more by sending a json response like:
return res.json({ status: 'OK', result: someResult});or
return res.json({ status: 'error', message: err});