How to Get Account Balance

get-account-balance.ts

import { address, createSolanaRpc } from "@solana/web3.js";

const rpc = createSolanaRpc("https://api.devnet.solana.com");
const LAMPORTS_PER_SOL = 1_000_000_000; // 1 billion lamports per SOL

const wallet = address("nicktrLHhYzLmoVbuZQzHUTicd2sfP571orwo9jfc8c");
const { value: balance } = await rpc.getBalance(wallet).send();
console.log(`Balance: ${Number(balance) / LAMPORTS_PER_SOL} SOL`);

As of v2.0.0, developers can use the default configurations within the main library (@solana/web3.js) or import any of its subpackages where better composition or more granular control over the imports is desired. See Tree-Shakability for more information.