48min

Using Hardhat

Overview
This guide walks you through using Hardhat to deploy an ERC721 NFT smart contract to the Palm network.
🏁 Prerequisites
﻿Get Palm Tokens to pay the deployment transaction fees.
﻿Connect to Palm network.﻿
﻿MetaMask Wallet Setup to get your private key.
Install Node.js.
Tutorial
1. Initialize Your NPM Project
Shell
|
2. Install Hardhat
Shell
|
3. Create a HardHat Project
a) Inside your npm project run:
Shell
|
b) Select  Create an empty hardhat.config.js
4. Add project folders
In the root directory of your project:
Shell
|
5. Write your contract
We'll use a contract based on the OpenZeppelin library’s [ERC-721 implementation]().
a) First, install the Open Zeppelin library in order to inherit its classes:
﻿
Shell
|
﻿
b) Next, create a file named NFT.sol under the contracts folder.
c) Lastly, add the following smart contract to NFT.sol file. 
Note that we have named our contract NFT, this can be any name. The name will be important in the next step.
﻿
JS
|
6. Install Hardhat Deploy
﻿
Shell
|
7. Install an Ethereum library
In this example, we will use Ether.js﻿
Shell
|
8. Set environment variables with dotenv﻿
 Install dotenv
Shell
|
Keep Your Private Keys Secret

Private keys must be kept secret and not committed to any code repository. In the example of this tutorial, the .env file should be added to your .gitignore file and kept local.

For example, see MyCrypto's Protecting Yourself and Your Funds guide.﻿
﻿
Create a .gitignore  file
A great example of a Solidity .gitignore file can be found here﻿
Create an  .env file n your project's root folder, and set environment variables in the file as follows
﻿Intro to Infura 
﻿MetaMask Wallet Setup﻿
PRIVATE_KEY = #The private key of the account you intend to use on the Palm network
INFURA_API_KEY = #Your Infura API key
﻿
9. Edit hardhat.config.js with the following text:
You can add additional supported fields on the hardhat.config.js  file.
JS
|
﻿
10. Compile your Contract
To make sure everything is working so far, let’s compile our contract:
Shell
Example Response
|
11. Write a deploy script
a) Navigate to the scripts folder and create a new file called deploy_NFT.js
b) Add the below code
JS
|
12. Deploy to the target Palm network environment
Palm Testnet
Palm Mainnet
Example log
|
﻿
﻿TLDR; How This is Working﻿
The task will execute the scripts in the scripts folder and saves the contract deployments to disk. Each deployment is saved into the deployments folder for the specific network.
13. Look Up Your Deployment on the Palm Network Block Explorer
﻿
Testnet
Mainnet
Explorer URL
﻿https://explorer.palm-uat.xyz﻿
﻿https://explorer.palm.io﻿
Paste your contract address into the search bar.
﻿
Get your contract address in 2 ways:
Log output Contract deployed to address: contractNumber 
In deployments/palm_testnet/NFT.json or deployments/palm_mainnet/NFT.json you can find:
Contract Address
ABI (Application Binary Interface) information
Get your contract address in 2 ways:
Console.log() output Contract deployed to address: contractNumber 
In deployments/palm_testnet/NFT.json or deployments/palm_mainnet/NFT.json where you will also find the ABI (Application Binary Interface) information.
﻿
You will see something like this upon successful deployment 👇 
14. Verify via Sourcify
Palm Testnet
Palm Mainnet
Example log
|
﻿More ways to verify﻿
Next Step 👉 Mint your NFT
Using the Smart Contract you just deployed you can now Mint your NFT﻿