index.js

const {
 Connection,
 PublicKey,
 clusterApiUrl,
 Keypair,
 LAMPORTS_PER_SOL,
 Transaction,
 Account,
} = require("@solana/web3.js");

const newPair = new Keypair();

const publicKey = new PublicKey(newPair._keypair.publicKey).toString();

const secretKey = newPair._keypair.secretKey;

const getWalletBalance = async () => {
  try {
    const connection = new Connection(clusterApiUrl("devnet"), "confirmed");
    const myWallet = await Keypair.fromSecretKey(secretKey);
    const walletBalance = await connection.getBalance(
      new PublicKey(myWallet.publicKey)
    );
    console.log(`Wallet balance OG: ${walletBalance}`);
    console.log(`Wallet balance: ${parseInt(walletBalance)/LAMPORTS_PER_SOL}SOL`);
  } catch (err) {
    console.log(err);
  }
};

const airDropSol = async () => {
  try {
    const connection = new Connection(clusterApiUrl("devnet"), "confirmed");
    const walletKeyPair = await Keypair.fromSecretKey(secretKey);
    console.log(`-- Airdropping 2 SOL --`);
    const fromAirDropSignature = await connection.requestAirdrop(
      new PublicKey(walletKeyPair.publicKey),
      2 * LAMPORTS_PER_SOL
    );
    await connection.confirmTransaction(fromAirDropSignature);
  } catch (err) {
      console.log(err);
  }
};

const driverFunction = async () => {
  await getWalletBalance();
  await airDropSol();
  await getWalletBalance();
};

driverFunction();