How does Express error-handling middleware work?
Express error-handling middleware uses four parameters: err, req, res, and next. It is used to centralize error handling and convert application errors into appropriate HTTP responses. A typical application defines error handling after its routes and other middleware.
Key Takeaways
- Error middleware has four parameters.
- It centralizes error handling.
- It is normally registered after routes.
Knowledge Check
How many parameters does Express identify as an error-handling middleware signature?