api-with-cluster.js

if (cluster.isMaster) {
  console.log(`Master ${process.pid} is running`)

  for (let i = 0; i < numCPUs; i++) {
    cluster.fork()
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log(`worker ${worker.process.pid} died`)
  })
} else {
  const express = require('express')

  const app = express()

  // define our endpoints here
   
  app.listen(port)

  console.log(`Process ${process.pid} started`)
}