Hardhat
Deploying Smart Contracts using Hardhat
What is Hardhat?
Hardhat is a development environment for Ethereum that helps developers manage and automate the common tasks involved in building smart contracts and decentralized applications. It can directly interact with Alpha Dune's Ethereum API, allowing for the deployment of smart contracts into the Alpha Dune network.
Additionally, Hardhat is a comprehensive set of tools for creating Ethereum-based software, which includes various components that aid in editing, compiling, debugging, and deploying smart contracts and decentralized applications. All of these components work together to create a complete development environment.
Creating a Hardhat Project
Create a directory for your project:
mkdir hardhat && cd hardhat
Initialize the project, which will create a
package.json
file
npm init -y
Install Hardhat
npm install hardhat
Create project
npx hardhat
Create an empty
hardhat.config.js
and install the Ethers plugin to use the Ethers.js library to interact with the network.
npm install @nomiclabs/hardhat-ethers ethers
Creating Your Smart Contract
Create a
contracts
directory
mkdir contracts && cd contracts
Create
your_contract.sol
file incontracts
directory
touch your_contract.sol
Creating Your Configuration File
Modify the Hardhat configuration file and create a secure file to store your private key in.
Create a
secrets.json
file to store your private key
touch secrets.json
Add your private key to
secrets.json
{
"privateKey": "YOUR-PRIVATE-KEY-HERE"
}
Add the file to your project’s
.gitignore
, and never reveal your private key.Modify the
hardhat.config.js
file
Import the
Ethers.js
pluginImport the
secrets.json
fileInside the
module.exports
add the Caldera network configuration
require('@nomiclabs/hardhat-ethers');
const { privateKey } = require('./secrets.json');
module.exports = {
solidity: "0.8.1",
defaultNetwork: "rinkeby",
networks: {
rinkeby: {
url: "https://eth-rinkeby.alchemyapi.io/v2/123abc123abc123abc123abc123abcde",
accounts: [privateKey]
},
caldera: {
url: "RPC URL", // Insert your RPC URL Here
chainId: CHAINID, //Insert your ChainID Here
}
},
}
Deploying Your Smart Contract
Compile the contract
npx hardhat compilejs
Create a new directory for the script and name it scripts and add a new file to it called
deploy.js
mkdir scripts && cd scripts
touch deploy.js
Create a deployment script, like the one below
async function main() {
// 1. Get the contract to deploy
const Your_Contract = await ethers.getContractFactory('your_contract');
console.log('Deploying Your_Contract...');
// 2. Instantiating a new smart contract
const your_contract = await Your_Contract.deploy();
// 3. Waiting for the deployment to resolve
await your_contract.deployed();
// 4. Use the contract instance to get the contract address
console.log('Your_Contract deployed to:', your_contract.address);
}
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
Deploy
your_contract.sol
using the command below
npx hardhat run scripts/deploy.js --network caldera
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