Answer
Callbacks use error-first pattern. Async/await uses try/catch or .catch() with promises.
Quick Answer
In async code, errors propagate through Promise rejections and callback err parameters. In Express, passing an error to next(err) triggers error-handling middleware. Unhandled Promise rejections in older Node versions crashed the process silently — Node 15+ throws them as errors. Always use try/catch in async handlers and pass errors to next().
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ