Express Error Middleware: Your App's Safety Net
Express error middleware is a safety net that intercepts unhandled errors, preventing crashes. It's used to centralize logging and format consistent error responses. The biggest footgun is placement: it must be defined *after* all other routes and middleware.
Express error middleware is a safety net that intercepts unhandled errors, preventing crashes. It's used to centralize error logging, format consistent API error responses, and show generic error pages instead of stack traces. The biggest footgun is placement: it must be defined *after* all other routes and middleware. Its unique four-argument signature `(err, req, res, next)` is also mandatory for Express to recognize it as an error handler.
Read the original → expressjs.com
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- #nodejs
- #error handling
- #middleware
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