> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ERC-721 Enumerable NFT

> An ERC-721 with Enumerable extension, allowing on-chain iteration of all minted tokens.

# ERC-721 Enumerable NFT

An ERC-721 with Enumerable extension, allowing on-chain iteration of all minted tokens.

An ERC-721 with Enumerable extension, allowing on-chain iteration of all minted tokens.

## Explanation

ERC721Enumerable adds on-chain indexing so you can query all tokens owned by an address without scanning logs. tokenOfOwnerByIndex returns the token ID at a given position. This is gas-expensive to deploy but convenient for dApps that need to display a user's NFT collection.

## Code

```solidity theme={null}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract EnumerableNFT is ERC721Enumerable, Ownable {
    uint256 private _nextId = 1;
    uint256 public constant MAX_SUPPLY = 10_000;
    uint256 public constant MINT_PRICE = 0.05 ether;

    constructor() ERC721("EnumerableNFT", "ENFT") Ownable(msg.sender) {}

    function mint() external payable {
        require(msg.value >= MINT_PRICE, "Insufficient ETH");
        require(_nextId <= MAX_SUPPLY, "Sold out");
        _safeMint(msg.sender, _nextId);
        _nextId++;
    }

    // Enumerable: get all token IDs owned by an address
    function tokensOfOwner(address owner) external view returns (uint256[] memory) {
        uint256 balance = balanceOf(owner);
        uint256[] memory tokens = new uint256[](balance);
        for (uint256 i = 0; i < balance; i++) {
            tokens[i] = tokenOfOwnerByIndex(owner, i);
        }
        return tokens;
    }
}
```

***

**Canonical knowledge ID:** `code-example:erc-721-enumerable-nft`