Hello Web3 App

This is a simple Web3 application that allows users to interact with a deployed smart contract on the Ethereum Sepolia testnet. The contract stores a message string which can be retrieved or updated by connected users using MetaMask.

Features

• Connect MetaMask wallet
• Read current message from the smart contract
• Update the message (on-chain transaction)

Technologies Used

• Solidity (Smart contract)
• Ethers.js (Frontend interaction)
• MetaMask (Wallet connection)
• Remix (Contract Deployment)
• VS Code (Frontend development)

How to Use

1. Open index.html in a web browser (preferably Chrome with MetaMask installed).
2. Click “Connect Wallet” to link your MetaMask.
3. Click “Get Message” to read the current value stored on-chain.
4. Enter a new message and click “Update Message” to send a transaction.

Smart Contract

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.2 <0.9.0;

contract HelloWeb3 {
string public message;

constructor(string memory _message) {
message = _message;
}

function setMessage(string memory _newMessage) public {
message = _newMessage;
}

function getMessage() public view returns (string memory) {
return message;
}
}