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How does Node.js handle asynchronous operations, and what are the differences between callbacks, promises, and async/await? Can you explain the event loop in Node.js and how it affects performance, especially when dealing with I/O-bound tasks? What is the purpose of middleware in Express.js, and can you provide an example of how you would create and use custom middleware in an application?
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Node Js Developer

Interviewed at Ilsa Interactive

3.9★
Dec 24, 2024

How does Node.js handle asynchronous operations, and what are the differences between callbacks, promises, and async/await? Can you explain the event loop in Node.js and how it affects performance, especially when dealing with I/O-bound tasks? What is the purpose of middleware in Express.js, and can you provide an example of how you would create and use custom middleware in an application?

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