node-hid - Access USB HID devices from Node.js

• node-hid - Access USB HID devices from Node.js
  • Platform Support
    • Supported Platforms
    • Supported Node versions
    • Supported Electron versions
  • Installation
    • Installation Special Cases
  • Examples
  • Async API Usage
  • Sync API Usage
  • Complete Async API
  • Complete Sync API
  • General notes:
    • Thread safety, Worker threads, Context-aware modules
    • Devices node-hid cannot read
  • Mac notes
  • Windows notes
    • Xbox 360 Controller on Windows 10
  • Linux notes
    • udev device permissions
    • Selecting driver type
  • Compiling from source
    • Linux (kernel 2.6 ) : (install examples shown for Debian/Ubuntu)
    • FreeBSD
    • Mac OS X 10.8
    • Windows 7, 8, 10
    • Building node-hid from source, for your projects
    • Build node-hid for node-hid development
    • Building node-hid for cross-compiling
  • Electron projects using node-hid
  • NW.js projects using node-hid
  • Support

Platform Support

node-hid currently supports Node.js v10 and upwards. For versions before that, you will need to use an older version. The platforms, architectures and node versions node-hid supports are the following. In general we try to provide pre-built native library binaries for the most common platforms, Node and Electron versions.

We strive to make node-hid cross-platform so there's a good chance any combination not listed here will compile and work.

Supported Platforms

• Windows x86 (32-bit)
• Windows x64 (64-bit)
• Mac OSX 10.9+
• Linux x64 (²)
• Linux x86 (¹)
• Linux ARM / Raspberry Pi / Various SBC (²)
• Linux ARM64 / Various SBC (²)
• Linux MIPSel (¹)
• Linux PPC64 (¹)

¹ prebuilt-binaries not provided for these platforms
² prebuilt binary built on Debian 10 Buster

Supported Node versions

• Node v10 to
• Node v20

Supported Electron versions

• Electron v3 to
• Electron v24

Future versions of Node or Electron should work with no extra work, since node-hid is now based on NAPI.

Installation

For most "standard" use cases (macOS, Windows, Linux x86), node-hid will install like a standard npm package:

npm install node-hid

If you install globally, the test program src/show-devices.js is installed as hid-showdevices. On Linux you can use it to try the difference between hidraw and libusb driverTypes:

$ npm install -g node-hid
$ hid-showdevices libusb
$ hid-showdevices hidraw

Installation Special Cases

We are using prebuild to compile and post binaries of the library for most common use cases (Linux, MacOS, Windows on standard processor platforms). If a prebuild is not available, node-hid will work, but npm install node-hid will compile the binary when you install. For more details on compiler setup, see Compling from source below.

Examples

In the src/ directory, various JavaScript programs can be found that talk to specific devices in some way. Some interesting ones:

• show-devices.js - display all HID devices in the system
• test-ps3-rumbleled.js - Read PS3 joystick and control its LED & rumblers
• test-powermate.js - Read Griffin PowerMate knob and change its LED
• test-blink1.js - Fade colors on blink(1) RGB LED
• test-bigredbutton.js - Read Dreamcheeky Big Red Button
• test-teensyrawhid.js - Read/write Teensy running RawHID "Basic" Arduino sketch

To try them out, run them with node src/showdevices.js from within the node-hid directory.

---

Async vs sync API

Since 3.0.0, node-hid supports both the old synchronous api, and a newer async api. It is recommended to use the async api to avoid node-hid from blocking your code from executing. For prototyping or tiny applications, this likely will not matter, but for npm libraries or larger applications it can be problematic.

Additionally, the sync api is limited to only beind able to read up to the UV_THREADPOOL_SIZE (default is 4) number of devices at once. Reading from multiple could degrade performance of your application, as there will be fewer than expected uv workers available for nodejs and other libraries to use for other tasks.

The async API is identical to the sync API described below, except every method returns a Promise that must be handled. Any unhandled promise can crash your application.

It is safe to use the sync api for some devices in an application, and the async api for other devices. The thread safety of hidapi is handled for you here to avoid crashes.

Cost of HID.devices(), HID.devicesAsync(), new HID.HID() and HIDAsync.open() for detecting device plug/unplug

All of HID.devices(), HID.devicesAsync(), new HID.HID() and HIDAsync.open() are relatively costly, each causing a USB (and potentially Bluetooth) enumeration. This takes time and OS resources. Doing either can slow down the read/write that you do in parallel with a device, and cause other USB devices to slow down too. This is how USB works.

If you are polling HID.devices() or HID.devicesAsync() or other inefficient methods to detect device plug / unplug, consider instead using node-usb. node-usb uses OS-specific, non-bus enumeration ways to detect device plug / unplug.

Async API Usage

List all HID devices connected

var HID = require('node-hid');
var devices = await HID.devicesAsync();

devices will contain an array of objects, one for each HID device available. Of particular interest are the vendorId and productId, as they uniquely identify a device, and the path, which is needed to open a particular device.

Sample output:

await HID.devicesAsync();
{ vendorId: 10168,
    productId: 493,
    path: 'IOService:/AppleACPIPl...HIDDevice@14210000,0',
    serialNumber: '20002E8C',
    manufacturer: 'ThingM',
    product: 'blink(1) mk2',
    release: 2,
    interface: -1,
    usagePage: 65280,
    usage: 1 },
  { vendorId: 1452,
    productId: 610,
    path: 'IOService:/AppleACPIPl...Keyboard@14400000,0',
    serialNumber: '',
    manufacturer: 'Apple Inc.',
    product: 'Apple Internal Keyboard / Trackpad',
    release: 549,
    interface: -1,
    usagePage: 1,
    usage: 6 },
    <and more>

Opening a device

Before a device can be read from or written to, it must be opened. Use either the path from the list returned by a prior call to HID.devicesAsync():

var device = await HID.HIDAsync.open(path);

or open the first device matching a VID/PID pair:

var device = await HID.HIDAsync.open(vid,pid);

The device variable will contain a handle to the device. If an error occurs opening the device, an exception will be thrown.

A node-hid device is an EventEmitter. While it shares some method names and usage patterns with Readable and Writable streams, it is not a stream and the semantics vary. For example, device.write does not take encoding or callback args and device.pause does not do the same thing as readable.pause. There is also no pipe method.

Reading from a device

To receive FEATURE reports, use await device.getFeatureReport().

To receive INPUT reports, use device.on("data",...). A node-hid device is an EventEmitter. Reading from a device is performed by registering a "data" event handler:

device.on("data", function(data) {});

You can also listen for errors like this:

device.on("error", function(err) {});

For FEATURE reports:

var buf = await device.getFeatureReport(reportId, reportLength)

Notes:

• Reads via device.on("data") are asynchronous
• To remove an event handler, close the device with device.close()
• When there is not yet a data handler or no data handler exists, data is not read at all -- there is no buffer.

Writing to a device

To send FEATURE reports, use device.sendFeatureReport().

To send OUTPUT reports, use device.write().

The ReportId is the first byte of the array sent to device.sendFeatureReport() or device.write(), meaning the array should be one byte bigger than your report. If your device does NOT use numbered reports, set the first byte of the 0x00.

device.write([0x00, 0x01, 0x01, 0x05, 0xff, 0xff]);

device.sendFeatureReport( [0x01, 'c', 0, 0xff,0x33,0x00, 70,0, 0] );

Notes:

• All writes and other operations performed with the HIDAsync device are done in a work-queue, so will happen in the order you issue them with the returned Promise resolving once the operation is completed
• You must send the exact number of bytes for your chosen OUTPUT or FEATURE report.
• Both device.write() and device.sendFeatureReport() return a Promise containing the number of bytes written + 1.
• For devices using Report Ids, the first byte of the array to write() or sendFeatureReport() must be the Report Id.

Sync API Usage

List all HID devices connected

var HID = require('node-hid');
var devices = HID.devices();

devices will contain an array of objects, one for each HID device available. Of particular interest are the vendorId and productId, as they uniquely identify a device, and the path, which is needed to open a particular device.

Sample output:

HID.devices();
{ vendorId: 10168,
    productId: 493,
    path: 'IOService:/AppleACPIPl...HIDDevice@14210000,0',
    serialNumber: '20002E8C',
    manufacturer: 'ThingM',
    product: 'blink(1) mk2',
    release: 2,
    interface: -1,
    usagePage: 65280,
    usage: 1 },
  { vendorId: 1452,
    productId: 610,
    path: 'IOService:/AppleACPIPl...Keyboard@14400000,0',
    serialNumber: '',
    manufacturer: 'Apple Inc.',
    product: 'Apple Internal Keyboard / Trackpad',
    release: 549,
    interface: -1,
    usagePage: 1,
    usage: 6 },
    <and more>

Opening a device

Before a device can be read from or written to, it must be opened. Use either the path from the list returned by a prior call to HID.devices():

var device = new HID.HID(path);

or open the first device matching a VID/PID pair:

var device = new HID.HID(vid,pid);

The device variable will contain a handle to the device. If an error occurs opening the device, an exception will be thrown.

A node-hid device is an EventEmitter. While it shares some method names and usage patterns with Readable and Writable streams, it is not a stream and the semantics vary. For example, device.write does not take encoding or callback args and device.pause does not do the same thing as readable.pause. There is also no pipe method.

Picking a device from the device list

If you need to filter down the HID.devices() list, you can use standard Javascript array techniques:

var devices = HID.devices();
var deviceInfo = devices.find( function(d) {
    var isTeensy = d.vendorId===0x16C0 && d.productId===0x0486;
    return isTeensy && d.usagePage===0xFFAB && d.usage===0x200;
});
if( deviceInfo ) {
  var device = new HID.HID( deviceInfo.path );
  // ... use device
}

You can also find device of interest by passing VID and PID

//return all the devices that match specified VID and PID
var devices = HID.devices(0x16C0,0x0486);

Reading from a device

To receive FEATURE reports, use device.getFeatureReport().

To receive INPUT reports, use device.on("data",...). A node-hid device is an EventEmitter. Reading from a device is performed by registering a "data" event handler:

device.on("data", function(data) {});

You can also listen for errors like this:

device.on("error", function(err) {});

For FEATURE reports:

var buf = device.getFeatureReport(reportId, reportLength)

Notes:

• Reads via device.on("data") are asynchronous
• Reads via device.getFeatureReport() are synchronous
• To remove an event handler, close the device with device.close()
• When there is not yet a data handler or no data handler exists, data is not read at all -- there is no buffer.

Writing to a device

To send FEATURE reports, use device.sendFeatureReport().

To send OUTPUT reports, use device.write().

All writing is synchronous.

The ReportId is the first byte of the array sent to device.sendFeatureReport() or device.write(), meaning the array should be one byte bigger than your report. If your device does NOT use numbered reports, set the first byte of the 0x00.

device.write([0x00, 0x01, 0x01, 0x05, 0xff, 0xff]);

device.sendFeatureReport( [0x01, 'c', 0, 0xff,0x33,0x00, 70,0, 0] );

Notes:

• You must send the exact number of bytes for your chosen OUTPUT or FEATURE report.
• Both device.write() and device.sendFeatureReport() return number of bytes written + 1.
• For devices using Report Ids, the first byte of the array to write() or sendFeatureReport() must be the Report Id.

Complete Async API

devices = await HID.devicesAsync()

• Return array listing all connected HID devices

devices = await HID.devicesAsync(vid,pid)

• Return array listing all connected HID devices with specific VendorId and ProductId

device = await HID.HIDAsync.open(path)

• Open a HID device at the specified platform-specific path

device = await HID.HIDAsync.open(vid,pid)

• Open first HID device with specific VendorId and ProductId

device.on('data', function(data) {} )

• data - Buffer - the data read from the device

device.on('error, function(error) {} )

• error - The error Object emitted

device.write(data)

• data - the data to be synchronously written to the device, first byte is Report Id or 0x00 if not using numbered reports.
• Returns number of bytes actually written

device.close()

• Closes the device. Subsequent reads will raise an error.

device.pause()

• Pauses reading and the emission of data events.
  This means the underlying device is silenced until resumption -- it is not like pausing a stream, where data continues to accumulate.

device.resume()

• This method will cause the HID device to resume emmitting data events. If no listeners are registered for the data event, data will be lost.

• When a data event is registered for this HID device, this method will be automatically called.

device.read(time_out)

• (optional) time_out - timeout in milliseconds
• Low-level function call to initiate an asynchronous read from the device.
• Returns a Promise containing a Buffer or the Promise will reject upon error.
• This can only be used when device.on('data', () => {}) is not being used. It will fail if a data handler is registered

device.sendFeatureReport(data)

• data - data of HID feature report, with 0th byte being report_id ([report_id,...])
• Returns number of bytes actually written

device.getFeatureReport(report_id, report_length)

• report_id - HID feature report id to get
• report_length - length of report

device.setNonBlocking(no_block)

• no_block - boolean. Set to true to enable non-blocking reads
• exactly mirrors hid_set_nonblocking() in hidapi

Complete Sync API

devices = HID.devices()

• Return array listing all connected HID devices

devices = HID.devices(vid,pid)

• Return array listing all connected HID devices with specific VendorId and ProductId

HID.setDriverType(type)

• Linux only
• Sets underlying HID driver type
• type can be "hidraw" or "libusb", defaults to "hidraw"

device = new HID.HID(path)

• Open a HID device at the specified platform-specific path

device = new HID.HID(vid,pid)

• Open first HID device with specific VendorId and ProductId

device.on('data', function(data) {} )

• data - Buffer - the data read from the device

device.on('error', function(error) {} )

• error - The error Object emitted

device.write(data)

• data - the data to be synchronously written to the device, first byte is Report Id or 0x00 if not using numbered reports.
• Returns number of bytes actually written

device.close()

• Closes the device. Subsequent reads will raise an error.

device.pause()

• Pauses reading and the emission of data events.
  This means the underlying device is silenced until resumption -- it is not like pausing a stream, where data continues to accumulate.

device.resume()

• This method will cause the HID device to resume emmitting data events. If no listeners are registered for the data event, data will be lost.

• When a data event is registered for this HID device, this method will be automatically called.

device.read(callback)

• Low-level function call to initiate an asynchronous read from the device.
• callback is of the form callback(err, data)

device.readSync()

• Return an array of numbers data. If an error occurs, an exception will be thrown.

device.readTimeout(time_out)

• time_out - timeout in milliseconds
• Return an array of numbers data. If an error occurs, an exception will be thrown.

device.sendFeatureReport(data)

• data - data of HID feature report, with 0th byte being report_id ([report_id,...])
• Returns number of bytes actually written

device.getFeatureReport(report_id, report_length)

• report_id - HID feature report id to get
• report_length - length of report

device.setNonBlocking(no_block)

• no_block - boolean. Set to true to enable non-blocking reads
• exactly mirrors hid_set_nonblocking() in hidapi

---

General notes:

Thread safety, Worker threads, Context-aware modules

In general node-hid is not thread-safe because the underlying C-library it wraps (hidapi) is not thread-safe. To mitigate this we are doing locking to ensure operations are performed safely. If you are using the sync api from multiple worker_threads, this will result in them waiting on each other at times.

Devices node-hid cannot read

The following devices are unavailable to node-hid because the OS owns them:

• Keyboards
• Mice
• Barcode readers (in USB HID keyboard mode)
• RFID scanners (in USB HID keyboard mode)
• Postage Scales (in USB HID keyboard mode)

Most OSes will prevent USB HID keyboards or mice, or devices that appear as a keyboard to the OS. This includes many RFID scanners, barcode readers, USB HID scales, and many other devices. This is a security precaution. Otherwise, it would be trivial to build keyloggers.

Some keyboard-pretending devices like barcode or RFID readers can be configured to be in "HID data" mode or "Serial / UART" mode. If in "HID Data" mode then node-hid can access them, if in "Serial / UART" mode, you should use node-serialport instead.

Mac notes

See General notes above Keyboards

Windows notes

See General notes above about Keyboards

Xbox 360 Controller on Windows 10

For reasons similar to mice & keyboards it appears you can't access this controller on Windows 10.

Linux notes

See General notes above about Keyboards

udev device permissions

Most Linux distros use udev to manage access to physical devices, and USB HID devices are normally owned by the root user. To allow non-root access, you must create a udev rule for the device, based on the devices vendorId and productId.

This rule is a text file placed in /etc/udev/rules.d.

For an example HID device (say a blink(1) light with vendorId = 0x27b8 and productId = 0x01ed, the rules file to support both hidraw and libusb would look like:

SUBSYSTEM=="input", GROUP="input", MODE="0666"
SUBSYSTEM=="usb", ATTRS{idVendor}=="27b8", ATTRS{idProduct}=="01ed", MODE:="666", GROUP="plugdev"
KERNEL=="hidraw*", ATTRS{idVendor}=="27b8", ATTRS{idProduct}=="01ed", MODE="0666", GROUP="plugdev"

Note that the values for idVendor and idProduct must be in hex and lower-case.

Save this file as /etc/udev/rules.d/51-blink1.rules, unplug the HID device, and reload the rules with:

sudo udevadm control --reload-rules

For a complete example, see the blink1 udev rules.

Selecting driver type

By default as of [email protected], the hidraw driver is used to talk to HID devices. Before [email protected], the more older but less capable libusb driver was used. With hidraw Linux apps can now see usage and usagePage attributes of devices.

If you would still like to use the libusb driver, then you can do either:

During runtime, you can use HID.setDriverType('libusb') immediately after require()-ing node-hid:

var HID = require('node-hid');
HID.setDriverType('libusb');

If you must have the libusb version and cannot use setDriverType(), you can install older node-hid or build from source:

npm install [email protected]

or:

npm install node-hid --build-from-source --driver=libusb

Compiling from source

To compile & develop locally or if prebuild cannot download a pre-built binary for you, you will need the following compiler tools and libraries:

Linux (kernel 2.6+) : (install examples shown for Debian/Ubuntu)

• Compilation tools: apt install build-essential git pkg-config
• libudev-dev: apt install libudev-dev (Debian/Ubuntu) / yum install libusbx-devel (Fedora)
• libusb-1.0-0 w/headers:apt install libusb-1.0-0 libusb-1.0-0-dev

FreeBSD

• Compilation tools: pkg install git gcc gmake libiconv node npm

Mac OS X 10.8+

• Xcode

Windows 7, 8, 10

The below is slightly stale. The 2021 solution is to use the official NodeJs Windows installer and pick "install native module tools"

• Visual C++ compiler and Python 2.7
  • either:
    • npm install --global windows-build-tools
    • add %USERPROFILE%\.windows-build-tools\python27 to PATH, like PowerShell: $env:Path += ";$env:USERPROFILE\.windows-build-tools\python27"
  • or:
    • Python 2.7
    • Visual Studio Express 2013 for Desktop

Building node-hid from source, for your projects

npm install node-hid --build-from-source

Build node-hid for node-hid development

• check out a copy of this repo
• change into its directory
• update the submodules
• build the node package

For example:

git clone https://github.com/node-hid/node-hid.git
cd node-hid                                        # must change into node-hid directory
npm install -g rimraf                              # just so it doesn't get 'clean'ed
npm run prepublishOnly                             # get the needed hidapi submodule
npm install --build-from-source                    # rebuilds the module with C code
npm run showdevices                                # list connected HID devices
node ./src/show-devices.js                         # same as above

You may see some warnings from the C compiler as it compiles hidapi (the underlying C library node-hid uses).
This is expected.

For ease of development, there are also the scripts:

npm run gypclean      # "node-gyp clean" clean gyp build directory
npm run gypconfigure  # "node-gyp configure" configure makefiles
npm run gypbuild      # "node-gyp build" build native code

Building node-hid for cross-compiling

When cross-compiling you need to override node-hid's normal behavior of using Linux pkg-config to determine CLFAGS and LDFLAGS for libusb. To do this, you can use the node-gyp variable node_hid_no_pkg_config and then invoke a node-hid rebuild with either:

  node-gyp rebuild --node_hid_no_pkg_config=1

or

  npm gyprebuild --node_hid_no_pkg_config=1

Electron projects using node-hid

If using node-hid with webpack or similar bundler, you may need to exclude node-hid and other libraries with native code. In webpack, you say which externals you have in your webpack-config.js:

  externals: {
    "node-hid": 'commonjs node-hid'
  }

Examples of node-hid in Electron:

• electron-hid-test - Simple example of using node-hid, should track latest Electron release
• electron-hid-test-erb - Simple example of using node-hid using electron-react-boilerplate
• electron-hid-toy - Simple example of using node-hid, showing packaging and signing
• Blink1Control2 - a complete application, using webpack (e.g. see its webpack-config.js)

NW.js projects using node-hid

Without knowing much about NW.js, a quick hacky solution that works is:

cd my-nwjs-app
npm install node-hid --save
npm install -g nw-gyp
cd node_modules/node-hid
nw-gyp rebuild --target=0.42.3 --arch=x64  // or whatever NW.js version you have
cd ../..
nwjs .

Support

Please use the node-hid github issues page for support questions and issues.