How does Node.js manage a large volume of incoming requests?

Node.js manages a large volume of incoming requests thanks to its event-driven, non-blocking architecture and single-threaded event loop.

Key points:

• Single-threaded event loop: Node.js uses one thread to handle events and requests, allowing efficient management of many connections without creating new threads.

• Non-blocking I/O: All input/output operations (such as reading files, database queries, network operations) are performed asynchronously, without blocking the main thread.

• Handling requests via callbacks/promises/async-await: When an I/O operation completes, the corresponding callback is invoked or the promise is resolved, allowing processing to continue.

Thus, Node.js can serve thousands of concurrent connections without creating a separate thread for each, saving resources and increasing scalability.

Example of a simple HTTP server in Node.js:

const http = require('http');

const server = http.createServer((req, res) => {
  // Handle request asynchronously
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World');
});

server.listen(3000);
console.log('Server running on port 3000');