Why use streams for large data in Node.js?
Because streams process data in chunks, keeping the event loop free between chunks. Loading a huge file into memory with fs.readFile blocks the event loop while parsing, but streaming processes it incrementally.
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More FAQs in How to Keep the Event Loop Non-Blocking in Node.js
Use async APIs instead of sync, offload CPU-heavy work to worker_threads, use streams for large data, avoid large JSON.parse, use Promise.all for parallel operations, monitor event loop lag, and use rate limiting to prevent overload.
Because sync APIs block the event loop for their entire duration, stopping all other requests. Use async APIs like fs.readFile instead of fs.readFileSync in any code that runs during request processing.
Offload it to worker_threads or a separate process. Do not run heavy computation like image processing or crypto on the main thread, since it blocks all requests. worker_threads run CPU-heavy work on separate threads.
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