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

# isAddress

```ts theme={null}
function isAddress(value): value is string
```

Returns true if `value` is a valid address.

## Parameters

| Parameter | Type  | Description         |
| :-------- | :---- | :------------------ |
| `value`   | `any` | The value to check. |

## Returns

`value is string`

True if the value is a valid address.

## Example

```js theme={null}
// Valid address
isAddress('0x8ba1f109551bD432803012645Ac136ddd64DBA72');

// Invalid checksum
isAddress('0x8Ba1f109551bD432803012645Ac136ddd64DBa72');
```

## Source

[address/checks.ts:46](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/address/checks.ts#L46)