This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The BluetoothRemoteGATTCharacteristic.readValue() method returns a Promise that resolves to an DataView holding a duplicate of the value property if it is available and supported. Otherwise it throws an error.


BluetoothRemoteGATTCharacteristic.readValue().then(function(dataView) { ... })


A Promise that resolves to an DataView.


Specification Status Comment
Web Bluetooth
The definition of 'readValue()' in that specification.
Draft Initial definition.

Browser Compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 45.0 [1] ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support No support ? ? ? ? ? 48.0 [2]

[1] Behind a flag.  Chrome OS only.

[2] Behind a flag. Requires Android 6 (Marshmallow).


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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Bluetooth BluetoothRemoteGATTCharacteristic Non-Standard Non-standard Property readValue Reference Web Bluetooth API