Your First Token

mkdir my-first-token && cd my-first-token
npm init -y
npm install --save-dev hardhat @nomicfoundation/hardhat-toolbox
npm install @openzeppelin/contracts dotenv
npx hardhat init   # choose: "Create an empty hardhat.config.js"
mkdir contracts scripts

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MyToken is ERC20, Ownable {
    constructor(address initialOwner)
        ERC20("MyToken", "MTK")
        Ownable(initialOwner)
    {
        // Mint 1,000,000 tokens (with 18 decimals) to the deployer.
        _mint(initialOwner, 1_000_000 * 10 ** decimals());
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }
}

TESTNET_RPC=https://testnet.hashio.io/api
TESTNET_PRIVATE_KEY=0xYOUR_METAMASK_PRIVATE_KEY

require("@nomicfoundation/hardhat-toolbox");
require("dotenv").config();

module.exports = {
  solidity: "0.8.22",
  networks: {
    hederaTestnet: {
      url: process.env.TESTNET_RPC,
      chainId: 296,
      accounts: [process.env.TESTNET_PRIVATE_KEY],
    },
  },
};

const hre = require("hardhat");

async function main() {
  const [deployer] = await hre.ethers.getSigners();
  console.log("Deploying with:", deployer.address);

  const MyToken = await hre.ethers.getContractFactory("MyToken");
  const token = await MyToken.deploy(deployer.address);
  await token.waitForDeployment();

  const address = await token.getAddress();
  console.log("MyToken deployed to:", address);
  console.log("Initial balance:", (await token.balanceOf(deployer.address)).toString());
}

main().catch((err) => {
  console.error(err);
  process.exitCode = 1;
});

npx hardhat compile
npx hardhat run scripts/deploy.js --network hederaTestnet

Deploying with: 0xAbC123...
MyToken deployed to: 0xDeF456...
Initial balance: 1000000000000000000000000