Deploy with Hardhat

Prerequisites

You should already have a Hardhat project set up, and have compiled your smart contract successfully. See the set up Hardhat and compile a smart contract tutorial for how to do so.

Optionally, but strongly recommended: You should also have tested your smart contract successfully. See the test a smart contract using Hardhat tutorial for how to do so.

Edit the deployment script

In order for the smart contract that you have compiled on your computer to exist on the Injective Testnet, it needs to be deployed onto the network.

To do so, we will make use of a script that uses an ethers instance that is pre-configured by Hardhat using the values specified in hardhat.config.js.

Open the file: script/deploy.js

async function main() {
    const Counter = await ethers.getContractFactory('Counter');
    const counter = await Counter.deploy({
        gasPrice: 160e6,
        gasLimit: 2e6,
    });
    await counter.waitForDeployment();
    const address = await counter.getAddress();

    console.log('Counter smart contract deployed to:', address);
}

Recall that after compiling the smart contracts, we looked at artifacts/contracts/Counter.sol/Counter.json? In this script, ethers.getContractFactory('Counter') retrieves that file, and extracts ABI and EVM bytecode from it. The following lines use that information to construct a deployment transaction and submit it to the network. If successful, the address at which your smart contract was deployed will be output, for example: 0x98798cc92651B1876e9Cc91EcBcfe64cac720a1b

Note that on other EVM networks, transactions (including deployment transactions), do not need to specify a gas price and a gas limit. Currently, however, this is necessary on Injective.

Run the deployment script

Run the following command to deploy the smart contract:

npx hardhat run script/deploy.js --network inj_testnet

Copy the deployed address, visit https://testnet.blockscout.injective.network, and paste the address in the search field. You'll visit the smart contract page in the block explorer for the smart contract that you have just deployed.

If you click on the "Contract" tab, you should see the EVM bytecode for that contract, and it will match the EVM bytecode found in your artifacts directory after compilation.

Next steps

Now that you have deployed your smart contract, you are ready to verify that smart contract! Check out the verify a smart contract using Hardhat tutorial next.