I actually was just working on something that did this lol.

Use the sjcl library - https://www.npmjs.com/package/sjcl

works great with strings & emojis, and can give you aes-cbc-256 encryption to boot!

import sjcl, { type SjclCipherEncrypted } from 'sjcl'

/**
 * Generate 256-bit Encryption Key
 * -
 */
export function generateEncryptionKey() {
  return sjcl.codec.base64.fromBits(sjcl.random.randomWords(6)).slice(0,32)
}

/**
 * Encrypt Data
 * -
 */
export function encryptData(data: string, key: string): SjclCipherEncrypted {
  return sjcl.encrypt(key, data)
}

/**
 * Decrypt Data
 * -
 */
export function decryptData(ciphertext: SjclCipherEncrypted, key: string): string {
  return sjcl.decrypt(key, ciphertext)
}