How to deploy a Smart Contract to the Testnet

In this article I will teach you how to deploy your contract to the Rinkeby Testnet.

To be faster we will use our project from another article: How to create a smart contract to mint an nft

Creating an account and an Ethereum project in Infura

Infura provides instant access over HTTPS and WebSockets to the Ethereum network.

Access Infura

Create your account (Common Steps).
Click Ethereum, then create new project.

Give a name for your project .
Save your project id.

Initial settings

Returning to the project, let's make the initial settings for our project.

Let's go to the hardhat.config.js file and add an object called network along with another object called rinkeby containing url and accounts.



require("@nomiclabs/hardhat-waffle");

/**
 * @type import('hardhat/config').HardhatUserConfig
 */

module.exports = {
  solidity: "0.8.3",
  networks: {
   rinkeby: {
     url: "", //Infura url with projectId
     accounts: [""] // add the account that will deploy the contract (private key)
    },
  }
};

Now in url we add the url with the project id provided by Infura and in accounts we add the private address of our wallet.

Note: Be careful with your private key, it gives access to your wallet and will spend its crypto to deploy the contract.



require("@nomiclabs/hardhat-waffle");

/**
 * @type import('hardhat/config').HardhatUserConfig
 */

module.exports = {
  solidity: "0.8.3",
  networks: {
   rinkeby: {
     url: "https://rinkeby.infura.io/v3/ba900937b83f4883b926713999277b1f", //Infura url with projectId
     accounts: ["123456789101112131415"] // add the account that will deploy the contract (private key)
    },
  }
};

Creating the script to deploy

Now to deploy the smart contract to rinkeby testnet, we are going to make a script with the hardhat that will make it easier for us to upload it with a command.

In the root directory, create a folder called scripts and inside a file called deploy.js



/node_modules
/contracts
/test
/scripts
 | - deploy.js
hardhat.config.js
package.json
yarn.lock

Now we're going to modify the file by adding the script below, where I'll explain it line by line.

deploy.js



const hre = require("hardhat"); //import the hardhat

async function main() {
  const [deployer] = await ethers.getSigners(); //get the account to deploy the contract

  console.log("Deploying contracts with the account:", deployer.address); 

  const FactoryNFT = await hre.ethers.getContractFactory("FactoryNFT"); // Getting the Contract
  const factoryNFT = await FactoryNFT.deploy(); //deploying the contract

  await factoryNFT.deployed(); // waiting for the contract to be deployed

  console.log("FactoryNFT deployed to:", factoryNFT.address); // Returning the contract address on the rinkeby
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  }); // Calling the function to deploy the contract

Now to deploy your contract just run this commands:



yarn compile



yarn hardhat run scripts/deploy.js --network rinkeby

result



Deploying contracts with the account: 0xAFEeb469Ce6376979Ea037b4CE6b7172f9018007
FactoryNFT deployed to: 0xF9e6b75cE8da147D4f1d7d2cc597A7A42A645006

Contract deployed!!!

Now you can Follow me on: Twitter
Project Repository: https://github.com/EmanuelCampos/mint-nft/tree/with-deploy-config

Blog

How to deploy a Smart Contract to the Testnet

Emanuel Ferreira

Creating an account and an Ethereum project in Infura

Initial settings

Creating the script to deploy

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