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1.11.0 • Public • Published


Bluetooth Low Energy (BLE) library written with pure Node.js (no bindings) - baked by Bluez via DBus

chrvadala Test Coverage Status npm Downloads Donate



This library works on many architectures supported by Linux. However Windows and Mac OS are not supported.

It leverages the bluez driver, a component supported by the following platforms and distributions

node-ble has been tested on the following architectures:

  • Raspbian
  • Ubuntu
  • Debian


npm install node-ble


Provide permissions

In order to allow a connection with the DBus daemon, you have to set up right permissions.

Create the file /etc/dbus-1/system.d/node-ble.conf with the following content (customize with userid)

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
  <policy user="%userid%">
   <allow own="org.bluez"/>
    <allow send_destination="org.bluez"/>
    <allow send_interface="org.bluez.GattCharacteristic1"/>
    <allow send_interface="org.bluez.GattDescriptor1"/>
    <allow send_interface="org.freedesktop.DBus.ObjectManager"/>
    <allow send_interface="org.freedesktop.DBus.Properties"/>

STEP 1: Get Adapter

To start a Bluetooth Low Energy (BLE) connection you need a Bluetooth adapter.

const {createBluetooth} = require('node-ble')
const {bluetooth, destroy} = createBluetooth()
const adapter = await bluetooth.defaultAdapter()

STEP 2: Start discovering

In order to find a Bluetooth Low Energy device out, you have to start a discovery operation.

if (! await adapter.isDiscovering())
  await adapter.startDiscovery()

STEP 3: Get a device, Connect and Get GATT Server

Use an adapter to get a remote Bluetooth device, then connect to it and bind to the GATT (Generic Attribute Profile) server.

const device = await adapter.waitDevice('00:00:00:00:00:00')
await device.connect()
const gattServer = await device.gatt()

STEP 4a: Read and write a characteristic.

const service1 = await gattServer.getPrimaryService('uuid')
const characteristic1 = await service1.getCharacteristic('uuid')
await characteristic1.writeValue(Buffer.from("Hello world"))
const buffer = await characteristic1.readValue()

STEP 4b: Subscribe to a characteristic.

const service2 = await gattServer.getPrimaryService('uuid')
const characteristic2 = await service2.getCharacteristic('uuid')
await characteristic2.startNotifications()
characteristic2.on('valuechanged', buffer => {
await characteristic2.stopNotifications()

STEP 5: Disconnect

When you have done you can disconnect and destroy the session.

await device.disconnect()


  • 0.x - Beta version
  • 1.0 - First official version
  • 1.1 - Migrates to gh-workflows
  • 1.2 - Upgrades deps
  • 1.3 - Adds typescript definitions #10
  • 1.4 - Upgrades deps
  • 1.5 - Adds write options configuration async writeValue (value, optionsOrOffset = {}) #20; Upgrades deps
  • 1.6 - Upgrades deps and removes some dependencies; migrates to npm; improves gh-actions
  • 1.7 - Fixes compatibility issue #30; Adds JSdoc; Deprecates NodeJS 10 and 12; Upgrades deps;
  • 1.8 - Upgrades deps and gh-actions os; Adds Bluetooth.activeAdapters() func #45;
  • 1.9 - Upgrades deps; Adds writeValueWithoutResponse() and writeValueWithResponse methods #47; Improves typescript definition #48
  • 1.10 - Upgrades deps and gh-actions; Fixes memory leak #37; Makes MAC Address case insensitive
  • 1.11 - Upgrades deps; Fixes doc #69; Adds getManufacturerData and getAdvertisingData functions on Device #67; Adds getServiceData functions on Device; Improves pre-requisite doc section #68



Similar libraries

Useful commands

Command Description
rm -r /var/lib/bluetooth/* Clean Bluetooth cache
hciconfig -a Adapter info
hcitool dev Adapter info (through Bluez)
d-feet DBus debugging tool
nvram bluetoothHostControllerSwitchBehavior=never Only on Parallels

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