Node.js, by default, operates on a single main thread, which is responsible for executing JavaScript code and handling the event loop. However, it also utilizes a pool of auxiliary threads for handling asynchronous I/O operations. This pool is managed by the libuv library, which Node.js uses to handle file system operations, network requests, and other asynchronous tasks[1][6].
The exact number of threads in this pool can vary. By default, libuv creates a thread pool with four threads, but this can be configured to have more or fewer threads depending on the needs of the application. The environment variable UV_THREADPOOL_SIZE can be set before starting the application to change the number of threads in the pool[1].
Additionally, Node.js supports the use of worker threads through the worker_threads module. This allows developers to create additional threads explicitly for executing JavaScript in parallel, which can be particularly useful for ...
