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#nodejs

Clusters of Node.js processes can be used to run multiple instances of Node.js that can distribute workloads among their application threads. When process isolation is not needed, use the worker_threads module instead, which allows running multiple application threads within a single Node.js instance.

The cluster module allows easy creation of child processes that all share server ports.

const cluster = require("cluster");
const os = require("os");
const process = require("process");
const app = require("express")();

const numCPUs = os.cpus().length;

if (cluster.isPrimary) {
  console.log(`Primary  $${process.pid} is running`);

  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }
} else {
  app.get("/", (req, res) => {
    res.writeHead(200);
    res.end("hello world\n");
  });

  app.listen(8000);
  console.log(`Worker$$ {process.pid} started`);
}

Running Node.js will now share port 8000 between the workers:

$ node server.js  

Primary 1748098 is running
Worker 1748105 started
Worker 1748107 started
Worker 1748106 started
Worker 1748114 started
Worker 1748113 started
Worker 1748132 started
Worker 1748120 started
Worker 1748131 started

Now you can scale your NodeJS without crashing server.