Web Bluetooth API

The Web Bluetooth API provides the ability to connect and interact with Bluetooth Low Energy peripherals.

Bluetooth

Provides methods to query Bluetooth availability and request access to devices.

BluetoothCharacteristicProperties

Provides properties of a particular BluetoothRemoteGATTCharacteristic.

BluetoothDevice

Represents a Bluetooth device inside a particular script execution environment.

BluetoothRemoteGATTCharacteristic

Represents a GATT Characteristic, which is a basic data element that provides further information about a peripheral's service.

BluetoothRemoteGATTDescriptor

Represents a GATT Descriptor, which provides further information about a characteristic's value.

BluetoothRemoteGATTServer

Represents a GATT Server on a remote device.

BluetoothRemoteGATTService

Represents a service provided by a GATT server, including a device, a list of referenced services, and a list of the characteristics of this service.

The Bluetooth API extends the following APIs, adding the listed features.

Navigator.bluetooth

Returns a Bluetooth object for the current document, providing access to Web Bluetooth API functionality.

The Web Bluetooth API can only be used in a secure context.

Access to the API is controlled by the Permissions Policy directive bluetooth. The default allowlist for the bluetooth policy is self, which enables Bluetooth usage in same-origin nested frames but prevents access by third-party content by default. Cross-origin access is enabled by specifying the allowed origins in both the Permissions-Policy: bluetooth HTTP header and the desired <iframe>.

In order to use the feature the user must first grant explicit permission (they will not be prompted for access if it is not allowed for other reasons, such as being blocked by a Permissions Policy). The permission prompt is displayed when calling Bluetooth.requestDevice() to request access to a new Bluetooth device for which permission is not granted (the owning global object must also have transient activation). You can use Bluetooth.getDevices() to retrieve any devices that have previously been granted permission for the site.

The Permissions API navigator.permissions.query() method can be used with the bluetooth permission to test whether a site has permission to use Bluetooth devices. The permission state will be granted, denied or prompt (requires user acknowledgement of a prompt):

const btPermission = await navigator.permissions.query({ name: "bluetooth" });
if (btPermission.state !== "denied") {
  // Do something
}