setup-solana-browser-app

name	setup-solana-browser-app
description	Set up a vanilla browser (non-React) app with @metamask/connect-solana using wallet-standard features directly. Use when integrating MetaMask Solana without a framework or wallet adapter library.

Setup Solana Browser App with MetaMask

When to use

Use this skill when:

• Integrating MetaMask with Solana in a vanilla JavaScript or non-React browser app
• Using wallet-standard features directly without @solana/wallet-adapter-react
• Building connect, sign, and send flows with the SolanaClient API
• Accessing wallet-standard features like solana:signTransaction or solana:signMessage directly

Workflow

Step 1: Install dependencies

npm install @metamask/connect-solana @metamask/connect-multichain @solana/web3.js

@metamask/connect-multichain is a regular dependency of @metamask/connect-solana and is installed transitively. (Only the 2.0.0 release briefly made it a peer dependency; 2.1.0 reverted that.) Installing it explicitly is harmless but not required. The SDK warns at runtime if duplicate or mismatched copies are resolved.

Step 2: Create the Solana client

import { createSolanaClient } from '@metamask/connect-solana';

const solanaClient = await createSolanaClient({
  dapp: {
    name: 'My Solana DApp',
    url: window.location.href,
  },
  api: {
    supportedNetworks: {
      mainnet: 'https://api.mainnet-beta.solana.com',
    },
  },
});

createSolanaClient returns Promise<SolanaClient>:

Property	Type	Description
core	MultichainCore	The underlying multichain client instance
getWallet()	() => Wallet	Returns the wallet-standard Wallet (from @wallet-standard/base)
registerWallet()	() => Promise<void>	Manually register the wallet (auto-called unless skipAutoRegister: true)
disconnect()	() => Promise<void>	Disconnect and revoke Solana scopes

Step 3: Get the wallet and connect

const wallet = solanaClient.getWallet();

// The wallet exposes wallet-standard features
console.log('Wallet name:', wallet.name); // "MetaMask"
console.log('Available features:', Object.keys(wallet.features));

Connect using the standard:connect feature:

const connectFeature = wallet.features['standard:connect'];
const { accounts } = await connectFeature.connect();

if (accounts.length > 0) {
  const account = accounts[0];
  console.log('Address:', account.address);
  console.log('Public key:', account.publicKey); // Uint8Array
  console.log('Chains:', account.chains); // e.g. ['solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp']
}

Step 4: Access wallet-standard features

The wallet exposes these wallet-standard features:

Feature Key	Description
standard:connect	Connect and request accounts
standard:disconnect	Disconnect the wallet
standard:events	Subscribe to account/chain change events
solana:signIn	Sign-In-With-Solana (SIWS) authentication
solana:signTransaction	Sign a transaction without sending
solana:signAndSendTransaction	Sign and broadcast a transaction
solana:signMessage	Sign an arbitrary message

There is no solana:signAndSendAllTransactions feature — to batch, pass multiple inputs to signAndSendTransaction(...inputs) (it is variadic and returns one result per input).

Step 5: Sign a message

const signMessageFeature = wallet.features['solana:signMessage'];

const message = new TextEncoder().encode('Hello from MetaMask on Solana!');

const [{ signature }] = await signMessageFeature.signMessage({
  account: accounts[0],
  message,
});

console.log('Signature:', Buffer.from(signature).toString('hex'));

Step 6: Sign and send a transaction

import {
  Connection,
  Transaction,
  SystemProgram,
  PublicKey,
  LAMPORTS_PER_SOL,
} from '@solana/web3.js';

const connection = new Connection('https://api.mainnet-beta.solana.com');
const { blockhash } = await connection.getLatestBlockhash();

const senderPubkey = new PublicKey(accounts[0].address);

const transaction = new Transaction().add(
  SystemProgram.transfer({
    fromPubkey: senderPubkey,
    toPubkey: new PublicKey('11111111111111111111111111111112'),
    lamports: 0.001 * LAMPORTS_PER_SOL,
  }),
);
transaction.recentBlockhash = blockhash;
transaction.feePayer = senderPubkey;

const serializedTransaction = transaction.serialize({
  requireAllSignatures: false,
});

const signAndSendFeature = wallet.features['solana:signAndSendTransaction'];

const [{ signature: txSignature }] = await signAndSendFeature.signAndSendTransaction({
  account: accounts[0],
  transaction: serializedTransaction,
  chain: 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
});

// txSignature is a Uint8Array — encode with bs58 ('base58' is NOT a Buffer encoding).
// Requires `npm install bs58` and `import bs58 from 'bs58'` at the top of the file.
const signatureBase58 = bs58.encode(txSignature);
console.log('Transaction signature:', signatureBase58);

// confirmTransaction expects the base58 signature string
const confirmation = await connection.confirmTransaction(signatureBase58, 'confirmed');
console.log('Confirmed:', confirmation);

Step 7: Listen for account and chain changes

const eventsFeature = wallet.features['standard:events'];

eventsFeature.on('change', ({ accounts: newAccounts }) => {
  if (newAccounts) {
    console.log('Accounts changed:', newAccounts.map((a) => a.address));
  }
});

Step 8: Disconnect

await solanaClient.disconnect();

Step 9: Full working example

import { createSolanaClient } from '@metamask/connect-solana';
import {
  Connection,
  Transaction,
  SystemProgram,
  PublicKey,
  LAMPORTS_PER_SOL,
} from '@solana/web3.js';

async function main() {
  const solanaClient = await createSolanaClient({
    dapp: {
      name: 'My Solana DApp',
      url: window.location.href,
    },
    api: {
      supportedNetworks: {
        mainnet: 'https://api.mainnet-beta.solana.com',
      },
    },
  });

  const wallet = solanaClient.getWallet();

  // Connect
  const connectFeature = wallet.features['standard:connect'];
  const { accounts } = await connectFeature.connect();
  const account = accounts[0];
  console.log('Connected:', account.address);

  // Sign message
  const signMessageFeature = wallet.features['solana:signMessage'];
  const [{ signature }] = await signMessageFeature.signMessage({
    account,
    message: new TextEncoder().encode('Hello Solana!'),
  });
  console.log('Message signed');

  // Send transaction
  const connection = new Connection('https://api.mainnet-beta.solana.com');
  const { blockhash } = await connection.getLatestBlockhash();
  const senderPubkey = new PublicKey(account.address);

  const tx = new Transaction().add(
    SystemProgram.transfer({
      fromPubkey: senderPubkey,
      toPubkey: new PublicKey('11111111111111111111111111111112'),
      lamports: 0.001 * LAMPORTS_PER_SOL,
    }),
  );
  tx.recentBlockhash = blockhash;
  tx.feePayer = senderPubkey;

  const signAndSendFeature = wallet.features['solana:signAndSendTransaction'];
  const [{ signature: txSig }] = await signAndSendFeature.signAndSendTransaction({
    account,
    transaction: tx.serialize({ requireAllSignatures: false }),
    chain: 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
  });
  console.log('Transaction sent');

  // Disconnect
  await solanaClient.disconnect();
}

main().catch(console.error);

Important Notes

• createSolanaClient is async — always await it before accessing the wallet. The factory returns a Promise<SolanaClient>.
• getInfuraRpcUrls helper — use getInfuraRpcUrls({ infuraApiKey: 'YOUR_KEY', networks: ['mainnet', 'devnet'] }) from @metamask/connect-solana to auto-generate supportedNetworks from Infura. Returns SolanaSupportedNetworks.
• Wallet name is exactly "MetaMask" — case-sensitive. Use this to identify the wallet if you enumerate registered wallets.
• Feature keys are string constants — always access features via bracket notation (e.g., wallet.features['solana:signTransaction']), not dot notation.
• Solana networks — mainnet, devnet, and testnet scopes are all modeled by the SDK and wallet-standard layer. Non-mainnet availability depends on the connected MetaMask build/version, so handle connection errors rather than assuming a cluster is present; for reads, point a @solana/web3.js Connection at the matching cluster.
• skipAutoRegister option — pass skipAutoRegister: true to createSolanaClient to prevent automatic wallet-standard registration. Useful when you want to control when the wallet becomes discoverable.
• analytics.integrationType option — pass an analytics: { integrationType: 'your-integration' } string to createSolanaClient (added in @metamask/connect-solana 0.8.0) to tag analytics events with your integration identifier.
• Injected Solana provider wins — since @metamask/connect-solana 1.0.0, if an injected Solana provider is already present (e.g. the MetaMask browser extension), createSolanaClient will not announce its own wallet-standard provider. Don't expect two "MetaMask" entries in the registered wallets list.
• Eager provider initialization + stable getWallet() — since @metamask/connect-solana 1.1.0, createSolanaClient() eagerly initializes the Solana wallet provider during creation; if the underlying multichain session already contains Solana scopes, the provider's accounts are populated by the time the client resolves (no need to wait for wallet_sessionChanged on cold start). getWallet() also returns the same wallet instance on every call now — safe to cache in a module-level constant, no need to re-await or recreate on subsequent access.
• disconnect() only revokes Solana scopes — EVM sessions managed by other clients remain active.
• Chrome on Android has a known bug where the page may unload during the connection flow. Add a beforeunload listener as a workaround:

  window.addEventListener('beforeunload', (e) => {
    e.preventDefault();
    e.returnValue = '';
  });