How can I implement encryption in a Node.js Express application?

How can I implement encryption in a Node.js Express application?

You can use the 'crypto' module in Node.js to implement encryption. Would you like a code example?

Yes, please provide a code example for encrypting and decrypting data.

Here's a simple example:

const crypto = require('crypto');
const algorithm = 'aes-256-cbc';
const key = crypto.randomBytes(32);
const iv = crypto.randomBytes(16);

function encrypt(text) {
    let cipher = crypto.createCipheriv(algorithm, Buffer.from(key), iv);
    let encrypted = cipher.update(text);
    encrypted = Buffer.concat([encrypted, cipher.final()]);
    return { iv: iv.toString('hex'), encryptedData: encrypted.toString('hex') };
}

function decrypt(encryptedData) {
    let iv = Buffer.from(encryptedData.iv, 'hex');
    let encryptedText = Buffer.from(encryptedData.encryptedData, 'hex');
    let decipher = crypto.createDecipheriv(algorithm, Buffer.from(key), iv);
    let decrypted = decipher.update(encryptedText);
    decrypted = Buffer.concat([decrypted, decipher.final()]);
    return decrypted.toString();
}

Would you like to know more about how to use this in your application?

Yes, how do I securely store the encryption key?

You should store the encryption key in a secure environment variable or use a secrets management service like AWS Secrets Manager.