Node.js and Express Interview Questions — a practical guide to Node.js Express interview questions with clear examples you can reuse in real projects.
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Short description
Interview prep should cover the event loop, middleware, REST methods, error handling, security basics, and differences between Node and browsers.
Quick Q&A sheet
Q: Is Node single-threaded?
A: JS runs on one thread; libuv can use a thread pool for some I/O.
Q: What is middleware?
A: Functions that process req/res and call next().
Q: PUT vs PATCH?
A: PUT usually replaces; PATCH partially updates.
Q: How do you handle errors in Express?
A: next(err) + centralized error middleware.