solana-kit

Solana Kit Development Guide

A comprehensive guide for building Solana applications with @solana/kit - the modern, tree-shakeable, zero-dependency JavaScript SDK from Anza.

Overview

Solana Kit (formerly web3.js 2.0) is a complete rewrite of the Solana JavaScript SDK with:

• Tree-shakeable: Only ship code you use (-78% bundle size)
• Zero dependencies: No third-party packages
• Functional design: Composable, no classes
• 10x faster crypto: Native Ed25519 support
• TypeScript-first: Full type safety

Quick Start

Installation

npm install @solana/kit

For specific program interactions:

npm install @solana-program/system @solana-program/token

Minimal Example

import {
  createSolanaRpc,
  createSolanaRpcSubscriptions,
  generateKeyPairSigner,
  lamports,
  pipe,
  createTransactionMessage,
  setTransactionMessageFeePayer,
  setTransactionMessageLifetimeUsingBlockhash,
  appendTransactionMessageInstruction,
  signTransactionMessageWithSigners,
  sendAndConfirmTransactionFactory,
  getSignatureFromTransaction,
} from "@solana/kit";
import { getTransferSolInstruction } from "@solana-program/system";

const LAMPORTS_PER_SOL = BigInt(1_000_000_000);

async function transferSol() {
  // 1. Connect to RPC
  const rpc = createSolanaRpc("https://api.devnet.solana.com");
  const rpcSubscriptions = createSolanaRpcSubscriptions("wss://api.devnet.solana.com");

  // 2. Create signers
  const sender = await generateKeyPairSigner();
  const recipient = await generateKeyPairSigner();

  // 3. Get blockhash
  const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();

  // 4. Build transaction with pipe
  const transactionMessage = pipe(
    createTransactionMessage({ version: 0 }),
    (tx) => setTransactionMessageFeePayer(sender.address, tx),
    (tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
    (tx) => appendTransactionMessageInstruction(
      getTransferSolInstruction({
        amount: lamports(LAMPORTS_PER_SOL / BigInt(10)), // 0.1 SOL
        destination: recipient.address,
        source: sender,
      }),
      tx
    )
  );

  // 5. Sign
  const signedTx = await signTransactionMessageWithSigners(transactionMessage);

  // 6. Send and confirm
  const sendAndConfirm = sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions });
  await sendAndConfirm(signedTx, { commitment: "confirmed" });

  console.log("Signature:", getSignatureFromTransaction(signedTx));
}