AES encryption and decryption with Node JS.

aes.js

const crypto = require('crypto');

key = "secretKey";
string = "your string";

let encryptedString = encrypt(key,string);
let decryptedString = decrypt(key,encryptedString);

console.log(encryptedString);
console.log(decryptedString);

function encrypt(KEY,text){
    const cipher = crypto.createCipher('aes256', KEY);
    var encrypted = cipher.update(text,'utf8', 'hex');
    encrypted += cipher.final('hex');
    return encrypted;
}

function decrypt(KEY,encryptedText){ 
    const decipher = crypto.createDecipher('aes256', KEY) 
    var decrypted = decipher.update(encryptedText,'hex','utf8') 
    decrypted += decipher.final('utf8'); 
    return decrypted; 
}