Does Node.js provide single-threaded task processing?

Node.js uses a single-threaded event loop to handle tasks, which allows efficient management of asynchronous operations without creating multiple threads.

However, despite the single-threaded nature of the main loop, Node.js can perform some operations (such as file input/output or computations) in a thread pool using the libuv library.

Thus, from the perspective of JavaScript code, processing is single-threaded, but underneath, there are multi-threaded mechanisms to optimize performance.

Example:

console.log('Start');
setTimeout(() => {
  console.log('Timeout callback');
}, 0);
console.log('End');

This code demonstrates single-threaded processing with asynchronous calls via the event loop.