Interview Q&A / Node.js

1. If Node.js is single-threaded, how does it handle thousands of requests at the same time?

   Your JavaScript runs on one main thread, but slow work like network and file I/O is handed to the operating system or libuv's thread pool. The main thread never sits waiting; it keeps taking new requests and runs each callback when its I/O finishes.

   BeginnerIn-depth3 min read
2. What are the main phases of the Node.js event loop?

   Timers, pending callbacks, idle/prepare, poll, check, and close callbacks. Timers run setTimeout callbacks, poll collects I/O, check runs setImmediate, and microtasks are drained between steps.

   IntermediateQuick answer1 min read