What are the advantages of using clustering in Node.js?

Clustering allows you to take advantage of multi-core systems by spawning multiple Node.js processes. Each process can handle its own event loop, improving performance and reliability. Using the cluster module, you can create a simple cluster:

const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
} else {
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('Hello, World!');
  }).listen(8000);
}