🧠 Simple Storage dApp (Anvil + Viem + MetaMask)

A simple full-stack Ethereum DApp built for local Anvil network using Viem and MetaMask.
It allows users to connect their wallet, set and get a stored value, and fetch user-specific stored values.

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⚙️ Features

• 🦊 Connect Wallet — Connects to MetaMask wallet
• ✏️ Update Value — Sets a new numeric value in the smart contract
• 📥 Get Value — Reads the latest global stored value
• 👤 User Value — Reads the latest value stored by the connected account
• 🔗 Local Only — Works exclusively with Anvil (Hardhat local chain)

🚀 Deployment Instructions

1️⃣ Start Anvil

anvil

This launches a local Ethereum test chain at:

http://localhost:8545
Chain ID: 31337

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2️⃣ Deploy the Contract

Use Foundry to deploy:

forge create --rpc-url http://localhost:8545 --private-key <YOUR_PRIVATE_KEY> src/SimpleStorage.sol:SimpleStorage

✅ Copy the deployed contract address shown in the output — you’ll need it for your front-end.

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💻 Frontend Setup

3️⃣ Configure Contract Details

In your index.js or index.html script, make sure to update:

const contractAddress = "<YOUR_DEPLOYED_CONTRACT_ADDRESS>";

The code uses Viem’s publicClient and walletClient to interact with the contract.

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4️⃣ Run the App

Simply open your index.html file in a browser:

file:///path/to/index.html

or run a local static server (optional):

npx serve .

Then, connect MetaMask (make sure MetaMask is connected to Localhost 8545 / Anvil network) and try:

1. Connect Wallet — to link your MetaMask
2. Update Value — to set a new stored number
3. Get Value — to read the global stored value
4. User Value — to read your account-specific value

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🔗 Requirements

• Foundry
• Anvil
• MetaMask
• Viem JavaScript library
• A modern browser (Chrome / Brave / Edge)

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🧰 Folder Structure

📦 simple-storage-dapp
 ┣ 📂 src
 ┃ ┗ 📜 MemoryValue.sol
 ┣ 📜 index.html
 ┣ 📜 index-js.js
 ┣ 📜 README.md

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🧠 Notes

• Works only on Anvil local network (chainId = 31337)
• You can use pre-funded Anvil private keys for testing
• If “Stored value” updates slowly, wait a few seconds for the block to confirm

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🧾 License

MIT © 2025 — Simple Storage Demo