Application up and running: https://rushank-nft-marketplace.netlify.app/
Connect your wallet to ropsten network and wait for a few seconds, it might show "No NFTs listed yet" before NFTs load. Fund your wallet with some ropsten eth to buy/sell nft.

Deployed on Ropsten testnet: 0xA3b10D635C92a5A1ae051293C26a107c272cc34B

Features:

• Buy the NFTs listed on marketplace, and resell them at higher price for profits.
• Create NFT of your ART.
• Pay listing price(0.025 ETH) to list your NFT on Marketplace.
• Earn ROYALTIES (2% from seller's profit) from your NFT reselling.

Frontend:

• Home- will show all nfts listed for sale
• Create NFT- to create your token
• My NFTs- will display all the nfts owned by you
• My Creation- will display all the nfts you created with their latest selling price

Solidity Contract:

• Dependencies used:

  1. @openzeppelin/contracts/utils/Counters.sol To track the tokens minted and sold on the marketpalce.
  2. @openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol To support off-chain storage of NFT artifacts.
  3. @openzeppelin/contracts/token/ERC721/ERC721.sol Standard for representing ownership of non-fungible tokens (introducing uniqueness)

• State Varibales:

  • Counters.Counter private _tokenIds; // unique token Id for every minted token
  • Counters.Counter private _itemsSold; // total items listed on marketplace
  • uint256 listingPrice = 0.025 ether;
  • address payable owner; // creator of market place who will recieve listingPice whenevr a NFT is sold
  • struct MarketItem {uint256 tokenId; address payable seller; address payable owner; uint256 price; bool sold;} // info of NFT
  • struct MarketItem_for_Royalty {address payable creator; uint256 pre_price; uint256 royalty_earned;} // royalty info of NFT
  • mapping(uint256 => MarketItem) private idToMarketItem; // store info for every tokenId
  • mapping(uint256 => MarketItem_for_Royalty) private idToMarketItem_for_Royalty; // store royalty info for every tokenId
  • event MarketItemCreated(uint256 indexed tokenId, address seller, address owner, uint256 price, bool sold);
  • event MarketItem_for_RoyaltyCreated(address creator, uint256 pre_price, uint256 royalty_earned);

• Functions:

  • function createToken(string memory tokenURI, uint256 price) public payable returns (uint256) {}

    • Mint new token
    • set URI for the token
    • add token as a market item by modifying state variable (uses createMarketItem())

  • function createMarketItem(uint256 tokenId, uint256 price) private {}

    • make changes to the state variables to store all token info
    • transfer token from creator to contract address
    • charges 0.025 ETH as listing fee
    • list nft

  • function createMarketSale(uint256 tokenId) public payable {}

    • calculate royalty (if not first time sell), and send it to creator
    • transfer token from contract address to buyer
    • modify state variables

  • function resellToken(uint256 tokenId, uint256 price) public payable {}

    • to list a token (bought before) for sale
    • charges 0.025 ETH as listing fee
    • transfers nft from owner to contract address
    • modify state variables

  • function fetchMarketItems() public view returns (MarketItem[] memory) {}

    • to get all tokens which are listed for sale

  • function fetchMyNFTs() public view returns (MarketItem[] memory) {}

    • to get all tokens owned my an address

  • function fetchItemsListed() public view returns (MarketItem[] memory) {}

    • to get all tokens created by an address

What's for V2.0?

• Fractionalized NFTs
• Improved Frontend
• Energized NFTs
• Collection listing
• Transfer NFT to wallet
• NFT activity log
• Video NFTs
• and more...