> For the complete documentation index, see [llms.txt](https://docs.icb.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.icb.network/build-on-icb-network/hardhat/configuring-hardhat-for-icb.md).

# Configuring Hardhat for ICB

          To deploy smart contracts to the ICB Network, you'll need to update your Hardhat project settings and include the ICB network configuration.

          To do this, open your `hardhat.config.ts` file and add the ICB network under the `networks` section:

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

module.exports = {
  solidity: {
    version: "0.8.20",
    settings: {
      optimizer: {
        enabled: true,
        runs: 1000,
      },
      evmVersion: "paris",
    },
  },
  networks: {
    ICBTestnet: {
      url: "https://rpc1-testnet.icbnetwork.info",
      chainId: 73114,
      accounts: process.env.PRIVATE_KEY ? [process.env.PRIVATE_KEY] : [],
    },
    ICBMainnet: {
      url: "https://rpc2-mainnet.icbnetwork.info",
      chainId: 73115,
      accounts: process.env.PRIVATE_KEY ? [process.env.PRIVATE_KEY] : [],
    },
  },
};
```

## Installing Hardhat Toolbox

          The configuration relies on the **@nomicfoundation/hardhat-toolbox** plugin, which conveniently bundles essential packages and plugins commonly used in Hardhat development.

          To install it, run the following command:

```bash
npm install --save-dev @nomicfoundation/hardhat-toolbox
```

## Managing Environment Variables

          The configuration also utilizes the **dotenv** package to securely load the `PRIVATE_KEY` environment variable from a `.env` file into `process.env.PRIVATE_KEY`. This approach helps keep your private keys out of your source code and version control.

          To install **dotenv**, run the following command:

```bash
npm install --save-dev dotenv
```