0While Node.js operates on a single-threaded event loop, its power lies in its event-driven architecture and use of callbacks, enabling efficient handling of a high volume of asynchronous requests.
Node.js combines JavaScript and C++ for optimal performance:
- JavaScript runs server-side using Google Chrome’s V8 engine, ensuring rapid execution.
- C++ libuv handles non-blocking I/O operations via background worker threads, managing tasks like file I/O and networking.
For example, when Node.js encounters hundreds of incoming requests, the event loop receives and delegates them to background workers. These workers process the requests asynchronously, and once completed, notify the event loop with the results. The event loop then invokes the associated callbacks to deliver the responses, all without blocking the main thread.
This design ensures high throughput, scalability, and responsiveness in Node.js applications.
