Programmatically generate keypair for Ethereum wallet: private key, public key and address

generate-eth-wallet-keypair.js

var keythereum = require('keythereum');
var Wallet = require('ethereumjs-wallet');

// Generate private key
var dk = keythereum.create();
var keyObject = keythereum.dump('password', dk.privateKey, dk.salt, dk.iv);
var privateKeyString = dk.privateKey.toString('hex');
console.log('Private key', privateKeyString);

// Get public key
var wallet = Wallet.fromPrivateKey(dk.privateKey);
var publicKey = wallet.getPublicKey();
console.log('Public key', publicKey.toString('hex'));

// Get wallet address
var address = wallet.getAddressString();
console.log('Address', address);