/Web APIs


Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The USBInterface interface of the WebUSB API provides information about an interface provided by the USB device. An interface represents a feature of the device which implements a particular protocol and may contain endpoints for bidirectional communication.


USBInterface() Experimental

Creates a new USBInterface object which will be populated with information about the interface on the provided USBConfiguration with the given interface number.

Instance properties

USBInterface.interfaceNumber Read only Experimental

Returns the interface number of this interface. This is equal to the bInterfaceNumber field of the interface descriptor defining this interface.

USBInterface.alternate Read only Experimental

Returns the currently selected alternative configuration of this interface. By default this is the USBAlternateInterface from alternates with alternateSetting equal to 0. It can be changed by calling USBDevice.selectAlternateInterface() with any other value found in alternates.

USBInterface.alternates Read only Experimental

Returns an array containing instances of the USBAlternateInterface interface describing each of the alternative configurations possible for this interface.

USBInterface.claimed Read only Experimental

Returns whether or not this interface has been claimed by the current page by calling USBDevice.claimInterface().


Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
USBInterface 61 79 No No 48 No No 61 No 45 No 8.0
USBInterface 61 79 No No 48 No
NoWebView exposes this interface, but does not support WebUSB. See Chromium bug 933055.
61 No 45 No 8.0
alternate 61 79 No No 48 No No 61 No 45 No 8.0
alternates 61 79 No No 48 No No 61 No 45 No 8.0
claimed 61 79 No No 48 No No 61 No 45 No 8.0
interfaceNumber 61 79 No No 48 No No 61 No 45 No 8.0

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