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by pier25 582 days ago
Almost everyone running Node in a machine with multiple cores is using multithreading.

Node is multithreaded by default. I believe the default setting is using 4 threads. Most of Node is written in C++.

The JS code written by end users is single threaded (most of it at least) but IO etc is all executed with libuv.

https://docs.libuv.org/en/v1.x/threadpool.html#threadpool