BluetoothCharacteristicProperties

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

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

The BluetoothCharacteristicProperties interface of the Web Bluetooth API provides the operations that are valid on the given BluetoothRemoteGATTCharacteristic.

This interface is returned by calling BluetoothRemoteGATTCharacteristic.properties.

Instance properties

authenticatedSignedWrites Read only Experimental

Returns a boolean that is true if signed writing to the characteristic value is permitted.

broadcast Read only Experimental

Returns a boolean that is true if the broadcast of the characteristic value is permitted using the Server Characteristic Configuration Descriptor.

indicate Read only Experimental

Returns a boolean that is true if indications of the characteristic value with acknowledgement is permitted.

notify Read only Experimental

Returns a boolean that is true if notifications of the characteristic value without acknowledgement is permitted.

read Read only Experimental

Returns a boolean that is true if the reading of the characteristic value is permitted.

reliableWrite Read only Experimental

Returns a boolean that is true if reliable writes to the characteristic is permitted.

writableAuxiliaries Read only Experimental

Returns a boolean that is true if reliable writes to the characteristic descriptor is permitted.

write Read only Experimental

Returns a boolean that is true if the writing to the characteristic with response is permitted.

writeWithoutResponse Read only Experimental

Returns a boolean that is true if the writing to the characteristic without response is permitted.

Examples

The following example shows how tell if a GATT characteristic supports value change notifications.

js
let device = await navigator.bluetooth.requestDevice({
  filters: [{ services: ["heart_rate"] }],
});
let gatt = await device.gatt.connect();
let service = await gatt.getPrimaryService("heart_rate");
let characteristic = await service.getCharacteristic("heart_rate_measurement");
if (characteristic.properties.notify) {
  characteristic.addEventListener(
    "characteristicvaluechanged",
    async (event) => {
      console.log(`Received heart rate measurement: ${event.target.value}`);
    },
  );
  await characteristic.startNotifications();
}

Specifications

Specification
Web Bluetooth
# characteristicproperties-interface

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
BluetoothCharacteristicProperties
Experimental
authenticatedSignedWrites
Experimental
broadcast
Experimental
indicate
Experimental
notify
Experimental
read
Experimental
reliableWrite
Experimental
writableAuxiliaries
Experimental
write
Experimental
writeWithoutResponse
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
Partial support
Partial support
No support
No support
Experimental. Expect behavior to change in the future.
See implementation notes.
Has more compatibility info.