node.js crypto simple aes 256 encryption

gistfile1.txt

const crypto = require('crypto')


var sharedSecret = crypto.randomBytes(32); // should be 128 (or 256) bits
var initializationVector = crypto.randomBytes(16); // IV is always 16-bytes
// var initializationVector = '0123456789abcdef'

var plaintext = "Everything's gonna be 200 OK!";
var encrypted;

cipher = crypto.Cipheriv('aes-256-cbc', sharedSecret, initializationVector);
encrypted += cipher.update(plaintext, 'utf8', 'base64');
encrypted += cipher.final('base64');

// I would need to send both the IV and the Encrypted text to my friend
// { iv: initializationVector.toString('base64')
// , cipherText: encrypted
// }


console.log(encrypted)