ERC721 NFT Contract

This project contains a simple ERC-721 compliant smart contract for creating and managing non-fungible tokens (NFTs) on the Polygon blockchain. The contract allows users to mint new NFTs, set their metadata (URI), and check the total supply and balance of NFTs.

Getting Started

Prerequisites

• Node.js (>= 12.0.0)
• npm (>= 6.0.0)
• Hardhat (>= 2.0.0)

Installation

1. Clone the repository:

   git clone https://github.com/your-username/your-repo.git
   cd your-repo
   

2. Install the required dependencies:

   npm install
   

Deployment

To deploy the ERC721 contract to the Goerli testnet, run the following command:

npx hardhat run scripts/deploy.js --network goerli

To deploy the ERC721 contract to the Mumbai testnet, run the following command:

npx hardhat run scripts/deploy.js --network mumbai

This will deploy the contract and display the contract address on the console.

Testing

To run the tests, use the following command:

npx hardhat test

Features

The contract provides the following functionalities:

1. mintNFT(address recipient, string memory tokenURI): Mint a new NFT with the given metadata URI and assign it to the specified recipient address.

2. tokenURI(uint256 tokenId): Retrieve the metadata URI associated with a specific NFT token ID.

3. totalSupply(): Get the total number of NFTs minted so far.

4. balanceOf(address owner): Get the number of NFTs owned by a particular address.

Example

Here's an example of how to use the ERC721 contract:

// Deploy the contract (using Hardhat)
const MyERC721 = await ethers.getContractFactory("MyERC721");
const myERC721 = await MyERC721.deploy("Kaylee's NFT", "KNFT", "Description of my NFTs");
await myERC721.deployed();

// Mint a new NFT
const recipient = "0xRecipientAddress"; // Replace with the recipient's Ethereum address
const tokenURI = "https://ipfs.io/ipfs/QmTokenMetadata"; // Replace with the token's metadata URI on IPFS
await myERC721.mintNFT(recipient, tokenURI);

// Retrieve token metadata URI
const tokenId = 1; // Token ID of the newly minted NFT
const metadataURI = await myERC721.tokenURI(tokenId);
console.log("Token Metadata URI:", metadataURI);

// Get total supply and balance of NFTs
const totalSupply = await myERC721.totalSupply();
console.log("Total NFTs:", totalSupply.toString());

const ownerAddress = "0xOwnerAddress"; // Replace with the address of the NFT owner
const balance = await myERC721.balanceOf(ownerAddress);
console.log("NFT Balance of Owner:", balance.toString());

Contributing

Contributions to this repository are not accepted as it is for personal assignments. However, if you have suggestions or feedback, feel free to open an issue.

Author

Mitali Sinha

License

This project is licensed under the MIT License.