a simple AES service to encrypt and decrypt plaintext

aes-nodejs-service.js

const express = require("express");
const cors = require('cors');
const crypto = require('crypto-js');

const PORT = process.env.PORT ?? 8080;
const HOST = process.env.HOST ?? '0.0.0.0';
const SECRET_KEY = process.env.SECRET_KEY ?? "write something secret here";

const app = express();
app.use(cors());
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.post("/api/aes/encrypt", function (req, res) {
    const plainText = req.body.rawText;

    if (!plainText) {
        res.json({ error: "Plain text is not available" });
    } else {
        const encrypted = crypto.AES.encrypt(plainText, SECRET_KEY).toString();
        res.json({ encryptedText: encrypted });
    }
});

app.post("/api/aes/decrypt", function (req, res) {
    const encryptedText = req.body.encryptedText;

    if (!encryptedText) {
        res.json({ error: "Encrypted text is not available" });
    } else {
        const bytes = crypto.AES.decrypt(encryptedText, SECRET_KEY);
        const originalText = bytes.toString(crypto.enc.Utf8);
        res.json({ originalText});
    }
});

app.listen(PORT, HOST, () => {
    console.info(`Server is listening on ${PORT}`);
});