Keyboard Listener

Listen to keyboard evdev event. For more complete evdev listener, please check this library evdev.

The intended use of this package is to listen to any keyboard-like device, such as RFID Reader or Barcode scanner.

This package needs the path to device input event, so it probably works only in Linux. Make sure you have read access to the input event path.

Usage

To list available input event

$ ls /dev/input
total 0
drwxr-xr-x  4 root root     580 Jun  6 20:48 .
drwxr-xr-x 22 root root    4500 Jun  6 22:21 ..
drwxr-xr-x  2 root root     120 Jun  6 20:48 by-id
drwxr-xr-x  2 root root     260 Jun  6 20:48 by-path
crw-rw----  1 root input 13, 64 Jun  2 22:45 event9
crw-rw----  1 root input 13, 65 Jun  2 22:45 event11
crw-rw----  1 root input 13, 74 Jun  2 22:45 event18

# or

$ ls /dev/input/by-id/ -la
total 0
drwxr-xr-x 2 root root 120 Jun  6 20:48 .
drwxr-xr-x 4 root root 580 Jun  6 20:48 ..
lrwxrwxrwx 1 root root  10 Jun  2 22:45 usb-Generic_Integrated_Camera_200901010001-event-if00 -> ../event11
lrwxrwxrwx 1 root root   9 Jun  2 22:45 usb-Logitech_USB_Optical_Mouse-event-mouse -> ../event9
lrwxrwxrwx 1 root root   9 Jun  2 22:45 usb-Logitech_USB_Optical_Mouse-mouse -> ../mouse4
lrwxrwxrwx 1 root root  10 Jun  6 20:48 usb-USB_Adapter_USB_Device-event-kbd -> ../event18

const KeyboarListener = require('@iqrok/keyboard-listener');
const eventpath = '/dev/input/by-id/usb-USB_Adapter_USB_Device-event-kbd';

const keyboard = new KeyboarListener();

keyboard.init({
			path: eventpath,
			readline: {
				on: 'keydown',
				debounce: 1000,
			},
		})
	.on('data', rec => console.log(rec))
	.on('readline', rec => console.log('line:', rec))
	.open();

References

1. https://www.kernel.org/doc/Documentation/input/event-codes.txt
2. https://github.com/torvalds/linux/blob/master/include/uapi/linux/input-event-codes.h