@metamask/sdk

Connecting to MetaMask

This feature allows you to connect to the MetaMask wallet and request access to the user's Ethereum accounts. The code sample demonstrates how to initialize the MetaMask SDK, get the provider, and request account access.

const { MetaMaskSDK } = require('@metamask/sdk');
const sdk = new MetaMaskSDK();
const ethereum = sdk.getProvider();

async function connect() {
  try {
    const accounts = await ethereum.request({ method: 'eth_requestAccounts' });
    console.log('Connected account:', accounts[0]);
  } catch (error) {
    console.error('Error connecting to MetaMask:', error);
  }
}

connect();

Sending Transactions

This feature allows you to send transactions through the MetaMask wallet. The code sample demonstrates how to create a transaction object and send it using the MetaMask provider.

const { MetaMaskSDK } = require('@metamask/sdk');
const sdk = new MetaMaskSDK();
const ethereum = sdk.getProvider();

async function sendTransaction() {
  try {
    const transactionParameters = {
      to: '0xRecipientAddress',
      value: '0x29a2241af62c0000', // 0.1 ETH in hexadecimal
      gas: '0x5208', // 21000 GWEI in hexadecimal
    };
    const txHash = await ethereum.request({
      method: 'eth_sendTransaction',
      params: [transactionParameters],
    });
    console.log('Transaction hash:', txHash);
  } catch (error) {
    console.error('Error sending transaction:', error);
  }
}

sendTransaction();

Listening for Events

This feature allows you to listen for events such as account changes and network changes. The code sample demonstrates how to set up event listeners for 'accountsChanged' and 'chainChanged' events.

const { MetaMaskSDK } = require('@metamask/sdk');
const sdk = new MetaMaskSDK();
const ethereum = sdk.getProvider();

ethereum.on('accountsChanged', (accounts) => {
  console.log('Accounts changed:', accounts);
});

ethereum.on('chainChanged', (chainId) => {
  console.log('Chain changed:', chainId);
});