BluetoothRemoteGATTCharacteristic

Limited availability

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.

The BluetoothRemoteGattCharacteristic interface of the Web Bluetooth API represents a GATT Characteristic, which is a basic data element that provides further information about a peripheral's service.

Instance properties

BluetoothRemoteGATTCharacteristic.service Read only: Returns the BluetoothRemoteGATTService this characteristic belongs to.
BluetoothRemoteGATTCharacteristic.uuid Read only: Returns a string containing the UUID of the characteristic, for example '00002a37-0000-1000-8000-00805f9b34fb' for the Heart Rate Measurement characteristic.
BluetoothRemoteGATTCharacteristic.properties Read only: Returns the properties of this characteristic.
BluetoothRemoteGATTCharacteristic.value Read only: The currently cached characteristic value. This value gets updated when the value of the characteristic is read or updated via a notification or indication.

Instance methods

BluetoothRemoteGATTCharacteristic.getDescriptor(): Returns a Promise that resolves to the first BluetoothRemoteGATTDescriptor for a given descriptor UUID.
BluetoothRemoteGATTCharacteristic.getDescriptors(): Returns a Promise that resolves to an Array of all BluetoothRemoteGATTDescriptor objects for a given descriptor UUID.
BluetoothRemoteGATTCharacteristic.readValue(): Returns a Promise that resolves to a DataView holding a duplicate of the value property if it is available and supported. Otherwise it throws an error.
BluetoothRemoteGATTCharacteristic.writeValue(): Sets the value property to the bytes contained in a given ArrayBuffer, writes the characteristic value with optional response, and returns the resulting Promise.
BluetoothRemoteGATTCharacteristic.writeValueWithResponse(): Sets the value property to the bytes contained in a given ArrayBuffer, writes the characteristic value with required response, and returns the resulting Promise.
BluetoothRemoteGATTCharacteristic.writeValueWithoutResponse(): Sets the value property to the bytes contained in a given ArrayBuffer, writes the characteristic value without response, and returns the resulting Promise.
BluetoothRemoteGATTCharacteristic.startNotifications(): Returns a Promise that resolves when navigator.bluetooth is added to the active notification context.
BluetoothRemoteGATTCharacteristic.stopNotifications(): Returns a Promise that resolves when navigator.bluetooth is removed from the active notification context.

Events

characteristicvaluechanged: Fired on a BluetoothRemoteGATTCharacteristic when its value changes.

Specifications

Specification
Web Bluetooth # bluetoothgattcharacteristic-interface

Browser compatibility

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This page was last modified on Oct 30, 2025 by MDN contributors.

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