Example of encryption and decryption in node.js

encrypt_decrypt_example.js

var crypto = require("crypto")

function encrypt(key, data) {
        var cipher = crypto.createCipher('aes-256-cbc', key);
        var crypted = cipher.update(data, 'utf-8', 'hex');
        crypted += cipher.final('hex');

        return crypted;
}

function decrypt(key, data) {
        var decipher = crypto.createDecipher('aes-256-cbc', key);
        var decrypted = decipher.update(data, 'hex', 'utf-8');
        decrypted += decipher.final('utf-8');

        return decrypted;
}

var key = "supersecretkey";
var text = "123|a123123123123123";
console.log("Original Text: " + text);

var encryptedText = encrypt(key, text);
console.log("Encrypted Text: " + encryptedText);
var decryptedText = decrypt(key, encryptedText);
console.log("Decrypted Text: " + decryptedText);

console.log("\nAnd again...\n");

console.log("Original Text: " + text);
encryptedText = encrypt(key, text);
console.log("Encrypted Text: " + encryptedText);
decryptedText = decrypt(key, encryptedText);
console.log("Decrypted Text: " + decryptedText);

text = "this is another text";
key = "this is another key";

console.log("\nNew text: & key: " + text);

encryptedText = encrypt(key, text);
console.log("Encrypted Text: " + encryptedText);
decryptedText = decrypt(key, encryptedText);
console.log("Decrypted Text: " + decryptedText);

@nazariyv first, there was a copy/paste error in Line #5 which I just fixed.

Second, what do you mean it doesn't work correctly after starting it again? Assuming you specify the exact same key and the right encrypted output it should decrypt it without a problem.