nodejs encryption decryption

NodeJS Encryption & Decryption

Table of Contents

1. About Encryption & Decryption
   • What is Encryption & Decryption
   • Use Cases of Encryption & Decryption
2. Implementation of Encryption & Decryption
   • Setup Fresh NodeJS Project
   • Install Packages expressjs, crypto-js
   • Create Sample Route
   • Use Encryption & Decryption
   • Complete Code Example

1. About Encryption & Decryption

1.1 What is Encryption & Decryption

Encryption is the process of converting plain text into a coded format to prevent unauthorized access. Decryption is the reverse process, converting the encrypted data back into its original form so it can be understood.

1.2 Use Cases of Encryption & Decryption

• Data Security: Protect sensitive information such as passwords and personal data.
• Secure Communication: Ensure that messages sent over the internet are read only by the intended recipient.
• Data Integrity: Prevent data tampering by ensuring that the data has not been altered during transmission.

2. Implementation of Encryption & Decryption

2.1 Setup Fresh NodeJS Project

mkdir nodejs-encryption-demo
cd nodejs-encryption-demo
npm init -y

2.2 Install Packages expressjs, crypto-js

npm install express crypto-js

2.3 Create Sample Route

Create a file named server.js and add the following code:

const express = require('express');

const app = express();
app.use(express.json());

const PORT = 3000;

app.get('/', (req, res) => {
    res.send('Welcome to NodeJS Encryption & Decryption Demo');
});

app.listen(PORT, () => {
    console.log(`Server running on http://localhost:${PORT}`);
});

2.4 Use Encryption & Decryption

Add encryption and decryption functions to the sample route:

const crypto = require('crypto-js');

const secretKey = 'mySecretKey';

// Encryption function
const encrypt = (text) => {
    return crypto.AES.encrypt(text, secretKey).toString();
};

// Decryption function
const decrypt = (cipherText) => {
    const bytes = crypto.AES.decrypt(cipherText, secretKey);
    return bytes.toString(crypto.enc.Utf8);
};

app.post('/encrypt', (req, res) => {
    const { text } = req.body;
    const encryptedText = encrypt(text);
    res.send({ encryptedText });
});

app.post('/decrypt', (req, res) => {
    const { cipherText } = req.body;
    const decryptedText = decrypt(cipherText);
    res.send({ decryptedText });
});

2.5 Complete Code Example

Here is the complete code combining all steps:

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

const app = express();
app.use(express.json());

const PORT = 3000;

const secretKey = 'mySecretKey';

// Encryption function
const encrypt = (text) => {
    return crypto.AES.encrypt(text, secretKey).toString();
};

// Decryption function
const decrypt = (cipherText) => {
    const bytes = crypto.AES.decrypt(cipherText, secretKey);
    return bytes.toString(crypto.enc.Utf8);
};

app.get('/', (req, res) => {
    res.send('Welcome to NodeJS Encryption & Decryption Demo');
});

app.post('/encrypt', (req, res) => {
    const { text } = req.body;
    const encryptedText = encrypt(text);
    res.send({ encryptedText });
});

app.post('/decrypt', (req, res) => {
    const { cipherText } = req.body;
    const decryptedText = decrypt(cipherText);
    res.send({ decryptedText });
});

app.listen(PORT, () => {
    console.log(`Server running on http://localhost:${PORT}`);
});