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An Introduction to Developing Web3 Apps Using Solidity and React

Checking for a Wallet

Explore how to verify the presence of a browser wallet extension such as MetaMask in a Web3 application. Learn to use React hooks like useState and useEffect to manage wallet detection state and provide user feedback on wallet connectivity in your decentralized app.

We'll cover the following...

Overview

Our application will require the user to have a wallet extension (such as MetaMask) available on their browser. The wallet is needed so that whoever deploys the contract can sign the transaction and pay the necessary gas for the operation.

We can see if the user has a wallet extension by checking if the window.ethereum object exists.

Node.js
export default function Home() {
// new addition
  const checkIfWalletIsConnected = () => {
    return Boolean(window.ethereum);
    };
  return (
    <div>
      <main>Home</main>
    </div>
  );
}

We want to display a message to the users if the wallet doesn’t exist. We can do so by creating a state ...