encrypt-decrypt.js

var crypto = require('crypto')
  , key = 'your secret key here'
  , plaintext = 'Text to be encrypted'
  , cipher = crypto.createCipher('aes-256-cbc', key)
  , decipher = crypto.createDecipher('aes-256-cbc', key);
  
var encryptedPassword = cipher.update(plaintext, 'utf8', 'base64');
encryptedPassword += cipher.final('base64')
 
var decryptedPassword = decipher.update(encryptedPassword, 'base64', 'utf8');
decryptedPassword += decipher.final('utf8');

console.log('original  :', plaintext); 
console.log('encrypted :', encryptedPassword);
console.log('decrypted :', decryptedPassword);