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Which of these is the correct way to handle errors in an async Express 4 route handler?

A Rely on Express to catch the rejection automatically
B Wrap the handler so rejections are passed to next(err)
C Use process.on('uncaughtException')
D Return the error as a string

Answer

Wrap the handler so rejections are passed to next(err)

Express 4 does not catch rejected promises from async handlers, so the request hangs. Express 5 handles this natively.

All NodeJS MCQs

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