This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
The USBIsochronousOutTransferPacket interface of the WebUSB API is part of the response from a call to the isochronousTransferOut() method of the USBDevice interface. It represents the status of an individual packet from a request to transfer data from the USB host to the USB device over an isochronous endpoint.
USBIsochronousOutTransferPacket() Experimental
Creates a new USBIsochronousOutTransferPacket object with the provided status and bytesWritten fields.
USBIsochronousOutTransferPacket.bytesWritten Read only Experimental
Returns the number of bytes from the packet that were sent to the device.
USBIsochronousOutTransferPacket.status Read only Experimental
Returns the status of the transfer request, one of:
"ok" - The transfer was successful."stall" - The device indicated an error by generating a stall condition on the endpoint. A stall on an isochronous endpoint does not need to be cleared.| Specification |
|---|
| WebUSB API> # usbisochronousouttransferpacket> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
USBIsochronousOutTransferPacket |
61 | 79 | No | 48 | No | 61 | No | 45 | No | 8.0 | No | No |
USBIsochronousOutTransferPacket |
61 | 79 | No | 48 | No | 61 | No | 45 | No | 8.0 | NoWebView exposes this interface, but does not support WebUSB. See bug 41441927. |
No |
bytesWritten |
61 | 79 | No | 48 | No | 61 | No | 45 | No | 8.0 | No | No |
status |
61 | 79 | No | 48 | No | 61 | No | 45 | No | 8.0 | No | No |
worker_support |
118Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.70–118Available in dedicated workers, not available in shared workers and service workers. |
118Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.79–118Available in dedicated workers, not available in shared workers and service workers. |
No |
104Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.57–104Available in dedicated workers, not available in shared workers and service workers. |
No |
118Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.70–118Available in dedicated workers, not available in shared workers and service workers. |
No |
79Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.49–79Available in dedicated workers, not available in shared workers and service workers. |
No |
25.0Available in dedicated workers and WebExtension service workers, not available in shared workers and normal service workers.10.0–25.0Available in dedicated workers, not available in shared workers and service workers. |
NoWebView exposes this interface, but does not support WebUSB. |
No |
© 2005–2025 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/USBIsochronousOutTransferPacket