---
title: USBDevice.claimInterface()
slug: Web/API/USBDevice/claimInterface
tags:
  - API
  - Method
  - Reference
  - USB
  - USBDevice
  - WebUSB
  - WebUSB API
  - claimInterface
browser-compat: api.USBDevice.claimInterface
---
{{APIRef("WebUSB API")}}{{SeeCompatTable}}

The **`claimInterface()`** method of the
{{domxref("USBDevice")}} interface returns a {{jsxref("promise")}} that resolves when
the requested interface is claimed for exclusive access.

## Syntax

```js
var promise = USBDevice.claimInterface(interfaceNumber)
```

### Parameters

- interfaceNumber
  - : The index of one of the interfaces supported by the device. Interfaces are
    device-specific.

### Return value

A {{jsxref("promise")}}.

## Example

The following example shows `claimInterface()` in the context of connecting
to a USB device.

    async function connectDevice(usbDevice) {
      await usbDevice.open();
      if (usbDevice.configuration === null)
        await usbDevice.selectConfiguration(1);
      await usbDevice.claimInterface(0);
    }

## Specifications

{{Specifications}}

## Browser compatibility

{{Compat}}
