hash-password.js

// npm install bcrypt
var bcrypt = require('bcrypt');
var password = process.argv[2];

bcrypt.genSalt(function(err, salt) {
  if (err) {
    console.log(err);
  }

  console.log('salt: ' + salt + ' (length: ' + salt.length + ')');

  bcrypt.hash(password, salt, function(err, encrypted) {
    if (err) {
      console.log(err);
    }

    console.log('encrypted: ' + encrypted + ' (length: ' + encrypted.length + ')');
  });
});