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

The transferIn() method of the USBDevice interface returns a promise that resolves with a USBTransferInResult when bulk or interrupt data is transmitted to the USB device.


var promise = USBDevice.transferIn(endpointNumber, length)


The number of a device-specific endpoint (buffer).
A variable to contain the length of the data that will be read back from the device. The actual data is in the USBInTransferResult in the resolved Promise.

Return value

A promise that resolves with a USBTransferInResult.


Specification Status Comment
The definition of 'transferIn()' in that specification.
Draft Initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support61 No No No48 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No61 No No48 No No

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Contributors to this page: jpmedley
Last updated by: jpmedley,