Node.js Web Apps With Express Error Handling
Example
Basic Error Handling
By default, Express will look for an 'error' view in the /views directory to render. Simply create the 'error' view and place it in the views directory to handle errors. Errors are written with the error message, status and stack trace, for example:
views/error.pug
html
body
h1= message
h2= error.status
p= error.stack
Advanced Error Handling
Define your error-handling middleware functions at the very end of the middleware function stack. These have four arguments instead of three (err, req, res, next) for example:
app.js
// catch 404 and forward to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
//pass error to the next matching route.
next(err);
});
// handle error, print stacktrace
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
You can define several error-handling middleware functions, just as you would with regular middleware functions.
