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

The deviceId readonly property of the MediaDeviceInfo interface returns a DOMString that is an identifier for the represented device and is persisted across sessions. It is un-guessable by other applications, and unique to the origin of the calling application. It is reset when the user clears cookies. For private browsing, a different identifier is used that is not persisted across sessions.


var deviceID = MediaDeviceInfo.deviceId


A DOMString.


Specification Status Comment
Media Capture and Streams
The definition of 'deviceId' in that specification.
Candidate Recommendation Initial definition.

Browser Compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support551 Yes39 No ?2 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support551551 Yes39 ?2 No ?

1. For earlier versions, this interface is available through the adapter.js polyfill

2. This interface is available in Opera through the adapter.js polyfill.

Document Tags and Contributors

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