Can I have multiple error-handling middlewares in Express?
Yes. For example, one for known ApiErrors that returns their status and message, and another for unknown 500s that logs and returns a generic message. Call next(err) from the first to pass to the second when the error is not an ApiError.
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More FAQs in Express Error-Handling Middleware Explained
It has four parameters (err, req, res, next). Express detects this arity and uses it for errors. Register it last. In handlers, throw or call next(err). Express then jumps to the error handler.
Use an asyncHandler wrapper: Promise.resolve(fn(req, res, next)).catch(next). This catches promise rejections and passes them to the error handler. Express 5 catches async errors automatically.
A subclass of Error with a status and message. Use it to throw new ApiError(404, 'User not found'). The error handler reads err.status and err.message, so errors are consistent and typed.
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