Standard NFT

The ERC721 smart contract standard is the basic standard for NFTs on EVM compatible chains.

The ERC721 is a smart contract standard which is specialised in single-copy Non Fungible Tokens (NFT) and out-of-the-box compatible with Opensea. In an ERC721, every NFT is unique which means you have to reference the content for each NFT.

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Variables

_name: The name of your NFT collection

_symbol: The symbol of your NFT collection

_owner: The owner of the NFT collection. Can be transferred and is initially set to the deployer wallet.

_currentTokenID: The Index of NFTs minted in this collection. Initially set to 1.

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Function	Input Parameters	Description	Output
constructor	None	Initializes the contract by setting the NFT's name and symbol, and assigns the contract deployer as the initial owner.	None
name	None	Returns the name of the NFT.	string memory
symbol	None	Returns the symbol of the NFT.	string memory
balanceOf	address owner	Returns the number of NFT tokens owned by a specific address.	uint256
ownerOf	uint256 tokenId	Returns the owner address of the specified token ID.	address
tokenImage	uint256 tokenId	Retrieves the image URL linked to a specific token ID.	string memory
transferFrom	address from, address to, uint256 tokenId	Transfers a token from one address to another, if the sender is approved or the owner.	None
approve	address to, uint256 tokenId	Approves another address to transfer a specific token ID.	None
setApprovalForAll	address operator, bool approved	Sets or unsets approval for an operator to manage all of the sender's tokens.	None
isApprovedForAll	address owner, address operator	Checks if an operator is approved to manage all tokens of a given owner.	bool
getApproved	uint256 tokenId	Returns the approved address for a specific token ID.	address
mint	address to, string memory imageUrl	Mints a new token to a specified address with an associated image URL, only callable by the owner.	None
_exists	uint256 tokenId	Internal function to check if a token exists.	bool
_isApprovedOrOwner	address spender, uint256 tokenId	Internal function to check if an address is an approved spender or the owner of a specific token ID.	bool
_transfer	address from, address to, uint256 tokenId	Internal function to handle the token transfer mechanics.	None
_approve	address to, uint256 tokenId	Internal function to set the approval of a given address to manage a specific token ID.	None