Solana Web3 JS Basic Example

solana_web3_example.js

const web3 = require("@solana/web3.js");

console.log("Generate keypair...");
const keypair = web3.Keypair.generate();
console.log("Public Key:", keypair.publicKey.toString());
console.log("Secret Key:", keypair.secretKey);
console.log("\n");
  
console.log("Connect to Solana...");
const connection = new web3.Connection(web3.clusterApiUrl('devnet'));
  
(async () => {
  console.log("Requesting Airdrop...");
  console.log("\n");
  const airdrop = await connection.requestAirdrop(keypair.publicKey, web3.LAMPORTS_PER_SOL);
  await connection.confirmTransaction(airdrop);
  
  const balance = await connection.getBalance(keypair.publicKey);
  console.log(`Balance after airdrop: ${balance/web3.LAMPORTS_PER_SOL} SOL`);
  
  console.log("Send transfer...");
  const receiver = web3.Keypair.generate();
  const transaction = new web3.Transaction().add(
    web3.SystemProgram.transfer({
      fromPubkey: keypair.publicKey,
      toPubkey: receiver.publicKey,
      lamports: 300000000,
    })
  );
  
  const signature = await web3.sendAndConfirmTransaction(
    connection,
    transaction,
    [keypair]
  );
  
  console.log("Updated balances...");
  const balanceSender = await connection.getBalance(keypair.publicKey);
  const balanceReceiver = await connection.getBalance(receiver.publicKey);
  console.log(`Balance Sender : ${balanceSender/web3.LAMPORTS_PER_SOL} SOL`);
  console.log(`Balance Receiver: ${balanceReceiver/web3.LAMPORTS_PER_SOL} SOL`);
})();