qr-reader

Nodejs QR code reader library. It's simple just return the QR string.

Requirement note

Enable a carriage return/line feed (enter key) suffix in QR device or this library not working properly.

Installation

To install via npm:

npm install --save @ahmadaidil/qr-reader

To install via yarn:

yarn add @ahmadaidil/qr-reader

Usage

Opening a device

input the qr device product id, vendor id and serial number at the param object

| object key | type | description | |-----|------|-------------| | productId | number | device product id | | vendorId | number | device vendor id | | serialNumber | string | device serial number |

const QRReader = require('@ahmadaidil/qr-reader')

const device = new QRReader({
  productId: 4608,
  vendorId: 1504,
  serialNumber: '20241523701421'
})

device.on('open', msg => console.log(msg)) // QR device with PID 4608, VID 1504 and SN 20241523701421 is now open!

Reading from a device

To receive the QR string, use device.on('data',...). A qr-reader device is an EventEmitter. Reading from a device is performed by registering a "data" event handler:

device.on('data', qrString => {});

You can also listen for errors like this:

device.on('error', err => {});

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.

©2021 Ahmad Aidil