How does JavaScript run on the server?
Through Node.js, which uses the V8 engine to compile and execute JS. Unlike the browser, server JS has access to the file system, network, and processes through libuv, which provides async I/O.
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More FAQs in Server-Side JavaScript and Node.js Interview Questions
A single-threaded loop that processes callbacks from completed async operations. It handles I/O asynchronously through libuv while processing one callback at a time, which makes Node.js non-blocking.
Blocking code stops the thread until it completes. Non-blocking code initiates the operation and processes the result via a callback when done. Always prefer non-blocking async APIs in Node.js to keep the event loop free.
A C library that provides async I/O for Node.js. It handles the event loop, file system operations, network operations, and the thread pool for blocking work. Without libuv, Node.js would not be non-blocking.
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