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

# approve

> The approve method can be used to approve required amount on root token.

The `approve` method can be used to approve required amount on root token.

```js theme={null}
const erc721RootToken = posClient.erc721(<root token address>,true);

const approveResult = await erc721RootToken.approve(<token id>);

const txHash = await approveResult.getTransactionHash();

const txReceipt = await approveResult.getReceipt();

```