> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tac.build/llms.txt
> Use this file to discover all available pages before exploring further.

# Hardhat

> Deploy, test, and verify Solidity contracts on TAC using Hardhat - the complete development environment

<CardGroup cols={1}>
  <Card title="Hardhat" icon="code" href="https://hardhat.org/docs/getting-started">
    Official documentation
  </Card>
</CardGroup>

TAC EVM Layer provides full compatibility with Hardhat, Ethereum's most popular development framework. Deploy your existing Solidity contracts without modification, test, and verify contracts on the [Block Explorer](/explorer/overview).

## Installation & Setup

Setting up Hardhat for TAC development requires no special configuration - it works exactly like any other EVM chain.

Refer to our example app [create-tac-app](/quickstart/overview) to see the relevant hardhat deployment approach.

## Deployment

Below you can find the deployment commands used within [create-tac-app](/quickstart/overview)

<Warning>
  Ensure you have sufficient TAC tokens for gas fees before deploying to mainnet.
</Warning>

<Tabs>
  <Tab title="Testnet Deployment">
    ```bash theme={null}
    # Deploy to TAC Saint Petersburg Testnet
    npx hardhat run scripts/deploy.ts --network tacTestnet
    ```
  </Tab>

  <Tab title="Mainnet Deployment">
    ```bash theme={null}
    # Deploy to TAC Mainnet (production)
    npx hardhat run scripts/deploy.ts --network tacMainnet
    ```
  </Tab>
</Tabs>

## Common Issues & Solutions

<AccordionGroup>
  <Accordion title="Connection Issues" icon="wifi-off">
    **Problem**: RPC connection failures or timeouts

    **Solutions**:

    * Verify RPC URLs are correct
    * Increase timeout in network configuration

    ```javascript theme={null}
    networks: {
        tacTestnet: {
            url: "https://spb.rpc.tac.build",
            timeout: 60000, // Increase timeout
        }
    }
    ```

    * Try alternative RPC endpoints if available
  </Accordion>
</AccordionGroup>