node-express-mongodb-jwt-rest-api-skeleton/app/middleware/auth/decrypt.js

Node.js express.js MongoDB JWT REST API - This is a basic API REST skeleton written on JavaScript using async/await. Great for building a starter web API for your front-end (Android, iOS, Vue, react, angular, or anything that can consume an API)

const crypto = require('crypto')

const secret = process.env.JWT_SECRET
const algorithm = 'aes-256-cbc'
// Key length is dependent on the algorithm. In this case for aes256, it is
// 32 bytes (256 bits).
const key = crypto.scryptSync(secret, 'salt', 32)
const iv = Buffer.alloc(16, 0) // Initialization crypto vector

/**
 * Decrypts text
 * @param {string} text - text to decrypt
 */
const decrypt = (text = '') => {
  const decipher = crypto.createDecipheriv(algorithm, key, iv)

  try {
    let decrypted = decipher.update(text, 'hex', 'utf8')
    decrypted += decipher.final('utf8')
    return decrypted
  } catch (err) {
    return err
  }
}

module.exports = { decrypt }