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

The BluetoothRemoteGATTDescriptor  interface of the Web Bluetooth API provides a GATT Descriptor, which provides further information about a characteristic’s value.

In earlier versions of the spec, this was called BluetoothGATTDescriptor.


interface BluetoothRemoteGATTDescriptor {
  readonly attribute BluetoothGATTCharacteristic characteristic;
  readonly attribute UUID uuid;
  readonly attribute ArrayBuffer? value;
  Promise<ArrayBuffer> readValue();
  Promise<void> writeValue(BufferSource value);


BluetoothRemoteGATTDescriptor.characteristicRead only
Returns the BluetoothRemoteGATTCharacteristic this descriptor belongs to.
BluetoothRemoteGATTDescriptor.uuidRead only
Returns the UUID of the characteristic descriptor, for example '00002902-0000-1000-8000-00805f9b34fb' for theClient Characteristic Configuration descriptor.
BluetoothRemoteGATTDescriptor.valueRead only
Returns the currently cached descriptor value. This value gets updated when the value of the descriptor is read.


Returns a Promise that resolves to an ArrayBuffer holding a duplicate  of the value property if it is available and supported. Otherwise it throws an error.
Sets the value property to the bytes contained in an ArrayBuffer and returns a Promise.


Specification Status Comment
Web Bluetooth
The definition of 'BluetoothRemoteGATTDescriptor' in that specification.
Draft Initial definition.

Browser Compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support57 ? ? ?44 ?
characteristic57 ? ? ?44 ?
uuid57 ? ? ?44 ?
value57 ? ? ?44 ?
readValue57 ? ? ?44 ?
writeValue57 ? ? ?44 ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No57 ? ?44 ? ?
characteristic No57 ? ?44 ? ?
uuid No57 ? ?44 ? ?
value No57 ? ?44 ? ?
readValue No57 ? ?44 ? ?
writeValue No57 ? ?44 ? ?

Document Tags and Contributors

Contributors to this page: ExE-Boss, fscholz, jpmedley, chrisdavidmills
Last updated by: ExE-Boss,