const { generateKeyPairSync, publicEncrypt, privateDecrypt } = require('crypto');
const { publicKey, privateKey } = generateKeyPairSync('rsa', {
  modulusLength: 4096,
  publicKeyEncoding: {
    type: 'spki',
    format: 'pem',
  },
  privateKeyEncoding: {
    type: 'pkcs8',
    format: 'pem'
  }
});

console.log('privateKey', privateKey);
console.log('publicKey', publicKey);

const message = {
  some: 'data',
  abc: 123
};

console.log('\nEncrypted message using public key:');
console.log(message);

const encryptedData = publicEncrypt(publicKey, Buffer.from(JSON.stringify(message)));
console.log('\nEncrypted message (base 64):')
console.log(encryptedData.toString('base64'));

const decryptedData = JSON.parse(privateDecrypt(privateKey, encryptedData).toString());
console.log('\nDecrypted message with private key:');
console.log(decryptedData);