Hardhat

Hardhat (opens in a new tab) is an Ethereum development environment. Compile your contracts and run them on a development network. Get Solidity stack traces, console.log and more.

You can use Hardhat to edit, compile, debug, and deploy your smart contracts to Mint.

Creating a Hardhat Project

1. Create a directory for your project:

mkdir hardhat && cd hardhat

2. Initialize the project, which will create a package.json file

npm init -y

3. Install Hardhat

npm install hardhat

4. Create a project

npx hardhat

5. 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

1. Create a contracts directory

mkdir contracts && cd contracts

2. Create your_contract.sol file in contracts 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.

1. Create a secrets.json file to store your private key

touch secrets.json

2. Add your private key to secrets.json

{
  "privateKey": "YOUR-PRIVATE-KEY-HERE"
}

3. Add the file to your project’s .gitignore, and never reveal your private key.

4. Modify the hardhat.config.js file

   • Import the Ethers.js plugin
   • Import the secrets.json file
   • Inside the module.exports add the Mint network configuration

require('@nomiclabs/hardhat-ethers');
const { privateKey } = require('./secrets.json');
 
module.exports = {
  solidity: "0.8.20",
  defaultNetwork: "mint-local",
  networks: {
      // for mainnet
    "mint-mainnet": {
      url: "https://rpc.mintchain.io",
      accounts: [process.env.PRIVATE_KEY as string],
      gasPrice: 1000000000,
    },
    // for Sepolia testnet
    "mint-sepolia": {
      url: "https://sepolia-testnet-rpc.mintchain.io",
      accounts: [process.env.PRIVATE_KEY as string]
      gasPrice: 1000000000,
    },
    // for local dev environment
    "mint-local": {
      url: "http://localhost:8545",
      accounts: [process.env.PRIVATE_KEY as string],
      gasPrice: 1000000000,
    },
  },
}