Basic Node.js crypto cipher/decipher example.

encrypt-decrypt.js

'use strict'

const crypto = require('crypto')
const key = 'salt_from_the_user_document'
const plaintext = '56d008a27c36552a0f97b291'
const cipher = crypto.createCipher('aes-256-cbc', key)
const decipher = crypto.createDecipher('aes-256-cbc', key)
  
let encryptedPassword = cipher.update(plaintext, 'utf8', 'base64')
encryptedPassword += cipher.final('base64')

let decryptedPassword = decipher.update(encryptedPassword, 'base64', 'utf8')
decryptedPassword += decipher.final('utf8')

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