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import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class AESUtils {

    public static String encrypt(String key, String data) throws Exception {
        Cipher cipher = initCipher(key, Cipher.ENCRYPT_MODE);
        byte[] encryptedByte = cipher.doFinal(data.getBytes());
        return Base64.encodeBase64String(encryptedByte);
    }

    public static String decrypt(String key, String data) throws Exception {
        Cipher cipher = initCipher(key, Cipher.DECRYPT_MODE);
        byte[] decryptedByte = cipher.doFinal(Base64.decodeBase64(data));
        return new String(decryptedByte);
    }

    private static Cipher initCipher(String key, int encryptMode) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(encryptMode, new SecretKeySpec(key.getBytes(), "AES"));
        return cipher;
    }

    public static void main(String[] args) throws Exception {
        
        String key = "1234567890123456";
        String value = "HelloWorld";

        
        System.out.println("key hex: " + Hex.encodeHexString(key.getBytes()));

        
        String encrypt = encrypt(key, value);
        System.out.println("encrypt: " + encrypt);
        
        String decrypt = decrypt(key, encrypt);
        System.out.println("decrypt: " + decrypt);
    }

}

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npm i crypto-js

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import CryptoJS from 'crypto-js';

const key = CryptoJS.enc.Utf8.parse('1234567890123456');
const value = CryptoJS.enc.Utf8.parse('HelloWorld');
const encrypted = CryptoJS.AES.encrypt(value, key, {
  mode: CryptoJS.mode.ECB,
  padding: CryptoJS.pad.Pkcs7
});
console.log(encrypted.toString());