nodejs-encrypt-decrypt.js

const algorithm = 'aes-256-ctr'
const secretKey = '654sd656s5ds5d4sd4s5d4sd'

function encrypt(string) {
  const iv = crypto.randomBytes(16)

  const cipher = crypto.createCipheriv(algorithm, secretKey, iv)

  const encrypted = Buffer.concat([cipher.update(string), cipher.final()])

  return {
    iv: iv.toString('hex'),
    content: encrypted.toString('hex')
  }
}

function decrypt(hash) {
  const decipher = crypto.createDecipheriv(algorithm, secretKey, Buffer.from(hash.iv, 'hex'))

  const decrypted = Buffer.concat([decipher.update(Buffer.from(hash.content, 'hex')), decipher.final()])

  return decrypted.toString()
}