Node.js · Middle · Question 28 of 75
How do you define error-handling middleware in Express?
- 1
app.onError(handler) - ✓Correct answer: A function with four parameters:
(err, req, res, next) - 3Any middleware named
error
Explanation
Express recognizes error handlers by their four parameters. Register them after all routes. Calling next(err) skips regular middleware and jumps to them.