How ERC721 Enumerable Works

An Enumerable ERC721 is an ERC721 with added functionality that enables a smart contract to list all the NFTs an address owns. This article describes how ERC721Enumerable functions and how we can integrate it into an existing ERC721 project. We’ll use Open Zeppelin’s popular implementation of ERC721Enumerable for our explanation.

To understand why we need an extension like ERC721Enumerable, let’s consider an example scenario. If we had to find all the NFTs a wallet owns from a particular ERC721 contract, how would we do it with the functionality available within ERC721?

We would have to call the balanceOf() function with the token owner’s address, which would give us the number of NFTs owned by that address. Then, we would loop over all the tokenIDs in the ERC721 contract and call the ownerOf() function for each of these tokenIDs.

Read the full article here:

Link: https://www.rareskills.io/post/erc-721-enumerable