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Explain the Node.js event loop. What are the phases in order?
Tip: Phases: timers, I/O callbacks, idle/prepare, poll, check (setImmediate), close callbacks. `process.nextTick` fires before ANY phase transition. Understanding this prevents subtle async ordering bugs.
What is the difference between `setTimeout`, `setImmediate`, and `process.nextTick`?
Tip: `process.nextTick` fires immediately after the current operation, before any I/O. `setImmediate` fires in the check phase — after I/O callbacks. `setTimeout(fn, 0)` fires in the timers phase. nextTick can starve I/O if used in a loop.
What are Node.js streams? Name the four types and a use case for each.
Tip: Readable (file read), Writable (file write), Duplex (TCP socket), Transform (gzip). Streams process data in chunks — ideal for large files, avoiding loading everything into memory. Pipe them: `fs.createReadStream().pipe(zlib.createGzip()).pipe(fs.createWriteStream())`.
How does clustering work in Node.js? Why use it?
Tip: Node.js is single-threaded and uses only one CPU core. Clustering forks the master process N times (one per CPU core) and load-balances connections across workers using the `cluster` module or PM2. PM2 is the practical production solution.
What is middleware in Express.js? Write a simple request-logging middleware.
Tip: Middleware is a function `(req, res, next) => {}` that has access to request/response and can modify them or pass control with `next()`. Example: `app.use((req, res, next) => { console.log(req.method, req.url); next(); })`.
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