Blockchain String Saver | Dapp

A small Ethereum DApp for saving and retrieving a string on the Sepolia testnet.

What it does

• Connects to MetaMask
• Saves a string to a smart contract
• Retrieves the latest saved string
• Shows transaction history for the connected wallet

Stack

• HTML, CSS, and JavaScript
• ethers.js
• MetaMask
• Sepolia testnet

Run it

1. Open index.html in a browser.
2. Make sure MetaMask is installed and unlocked.
3. Connect to Sepolia. If you need test ETH, get some from the Google Sepolia Faucet (the Chainstack Faucet mentioned in the blog no longer works reliably).
4. Save a string and view the transaction on Etherscan.

Note

The contract address is hardcoded in script.js, so if you deploy a new contract you will need to update it there.

Based on

A Hands-on Guide to Building Your First Decentralized Application by Davide Zambiasi on the Hyperskill blog.