This repository describe how to code and deploy your first smart contract on Goerli testnet of Ethereum. Using virtual wallet (MetaMask), Solidity, HardHat and Alchemy. Let's dive into it!
First, run this code to install all package needed for the project (check in package.json)
npm install
Next, we need the environment to deploy and manage smart contracts.
- Sign up an Alchemy account here and then create an app in Goerli network.
- Download extension MetaMask here to build an Ethereum account address, then switch to Goerli Test Network. Need fake ETH to deploy smart contract? Visit this faucet provided by Alchemy to get free 0.25 Goerli ETH per day.
To connect MetaMask & Alchemy with this project, we need to create a .env file
API_URL = "https://eth-goerli.g.alchemy.com/v2/your-api-key"
PRIVATE_KEY = "your-metamask-private-key"
This two key can fill by your information in Alchemy app HTTPS and MetaMask Private Key.
Finally, run code to compile & deploy the smart contract
npx hardhat compile
npx hardhat run scripts/deploy.js --network goerli
Contract deployed !!! 🎉🎉🎉
For more information, visit Ethereum tutorial here. You can also apply the Ethereum Request for Comments (ERC) by OpenZeppelin to this project to write and deploy another smart contract (ERC-20, ERC-721, ERC-777, ERC-1155).
Now, we've successfully deployed a smart contract to Goerli network. Let's interact with it!
Add two new lines into .env file, which is your Alchemy app API key get from API URL and your deployed smart contract address.
API_KEY = "your-alchemy-app-api-key"
CONTRACT_ADDRESS = "your-contract-deployed-address"
You can run this code to try change the contract message. Which original is "Hello World!" we have implement in deploy.js
npx hardhat run scripts/interact.js --network goerli
To allow everyone view and interact with your smart contract. You can publish it to Etherscan You can register an account here and create an app in API Keys option.
Next, connect Etherscan app with this project by add another line into .env file
ETHERSCAN_API_KEY = "your-etherscan-api-key-token"
Lastly, verify your smart contract on Etherscan now!
npx hardhat verify --network goerli YOUR_DEPLOYED_CONTRACT_ADDRESS 'your-contract-message'