Practice event loop, streams, modules, and async patterns with backend interview scenarios
Start Practicing NowUnderstand Node.js architecture, event loop, and non-blocking I/O
Master callbacks, promises, async/await, and error handling
Learn clustering, worker threads, and optimization techniques
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Event loop and asynchronous programming
Streams and buffers
Module system (CommonJS, ES modules)
Express.js and web frameworks
Error handling and debugging
Performance optimization and clustering
A: Node.js uses an event-driven, non-blocking I/O model. The event loop handles asynchronous operations by delegating I/O tasks to the system kernel (libuv), which uses threads. When operations complete, callbacks are queued and executed. This allows handling many concurrent connections without creating threads for each one.
A: process.nextTick() callbacks execute immediately after the current operation, before the event loop continues. setImmediate() callbacks execute in the next iteration of the event loop. nextTick has higher priority and can potentially block the event loop if used recursively. Use setImmediate for deferring execution without blocking.
A: Streams are objects for handling data in chunks rather than loading everything into memory. Types: Readable, Writable, Duplex, Transform. Use streams for large files, real-time data, or when you want to start processing data before it's fully available. Example: fs.createReadStream() for reading large files efficiently.
A: With Promises, use .catch() or second argument in .then(). With async/await, use try/catch blocks. For unhandled rejections, listen to 'unhandledRejection' event. Best practice: always handle errors, use try/catch in async functions, and avoid mixing Promise chains with async/await in the same function.
Understand the event loop phases: timers, pending callbacks, poll, check, close
Know when to use callbacks, Promises, async/await, and event emitters
Master cluster module for utilizing multiple CPU cores
Understand the difference between Buffer and Stream
Practice error-first callback pattern and proper error handling
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