Node.js child_process.fork() method example: forking hash_worker.js to generate password hash using node.js crypto module

hash_worker.js

const crypto = require('crypto');

process.on('message', (password) => {
  crypto.randomBytes(32, (err, salt) => {
    if (err) {
      process.send({ error: err.message });
    } else {
      crypto.pbkdf2(password, salt, 10000, 64, 'sha512', (err, derivedKey) => {
        if (err) {
          process.send({ error: err.message });
        } else {
          process.send({ salt: salt.toString('hex'), hash: derivedKey.toString('hex') });
        }
        process.exit();
      });
    }
  });
});

nodejs_child_process_fork_method.js

const { fork } = require('child_process');
const path = require('path');
  
const hashWorker = fork(path.join(__dirname, 'hash_worker.js'));
const passwordToHash = '$ecreT_Pa$$w0rd';

hashWorker.on('message', (message) => {
	if (message.error) {
		console.error('Error:', message.error);
	} else  if (message.hash) {
		console.log('Hashed Password:', message.hash);
	}
});

hashWorker.send(passwordToHash);