How do you handle errors in async Node.js code?
Use try/catch with async/await, or .catch with promises. Add a global unhandled rejection handler as a safety net, since unhandled rejections crash the process in newer Node.js versions.
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More FAQs in Async JavaScript and Event Loop Interview Questions for Node.js
A single-threaded loop that processes callbacks from completed async operations. It has phases (timers, pending, poll, check, close) and makes Node.js non-blocking by handling I/O asynchronously through libuv.
setTimeout runs in the timers phase after a delay. setImmediate runs in the check phase, right after the poll phase. On the next tick, setImmediate usually runs before setTimeout(0) when there are no pending timers.
A Node.js-specific function that schedules a callback to run before promise microtasks, both before macrotasks. It runs first among microtasks. Use it when you need to run code before promises on the next tick.
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