> For the complete documentation index, see [llms.txt](https://docs.5sky.io/ecosystem/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.5sky.io/ecosystem/developers/decentralization-and-transparent-commitment/tokenuri-function.md).

# TokenURI function

how you can use `web3.js` to call the `tokenURI` function from an ERC-721 compliant smart contract and retrieve the URI for a specific token ID:

#### JavaScript Code:

```javascript
const Web3 = require('web3');
const web3 = new Web3('https://bsc-dataseed.binance.org/'); 

const contractABI = [...]; // The ABI of your ERC-721 contract
const contractAddress = '0x511B52B473aB081B08E98F679501492eBBaB509f';

const contract = new web3.eth.Contract(contractABI, contractAddress);

async function getTokenURI(tokenId) {
    try {
        const uri = await contract.methods.tokenURI(tokenId).call();
        console.log(`URI for token ID ${tokenId}:`, uri);
        return uri;
    } catch (error) {
        console.error("Error fetching token URI:", error);
    }
}

const tokenId = 123; // Replace with your desired token ID
getTokenURI(tokenId);
```

1. **Initialization**:
   * We start by importing the `Web3` library and initializing a `web3` instance with an BSC node URL.
   * We then define the ABI (Application Binary Interface) of our ERC-721 contract and the contract's address. The ABI allows us to interact with the contract's functions.
   * Using the ABI and address, we create a `contract` instance which will be used to interact with the smart contract on the BSC blockchain.
2. **`getTokenURI` Function**:
   * This asynchronous function takes a `tokenId` as its argument.
   * Inside the function, we use `contract.methods.tokenURI(tokenId).call()` to call the `tokenURI` function from the smart contract. This returns the URI associated with the provided `tokenId`.
   * If successful, the URI is logged to the console and returned. If there's an error (e.g., the token doesn't exist), an error message is logged.
3. **Function Call**:
   * Finally, we call the `getTokenURI` function with a specific `tokenId` to retrieve and log its associated URI.

When you run this code, it will connect to the BSC blockchain, query the smart contract for the URI of the specified token ID, and then print the URI to the console.