qrencode-raw

qrencode-raw

A node.js wrapper for libqrencode, but instead of encoding data to image, it returns raw QR data in buffer, which allows you to do amazing things.

Install

You may need to install libqrencode-dev (>= 3.2) before install this package.

# Ubuntu
sudo apt-get install libqrencode-dev

# OS X
brew install libqrencode

npm install --save qrencode-raw

Usage

var QR = require('qrencode-raw');
var res = QR.encode(data, level, version);

• data string | Buffer data to encode, cannot be empty
• level QRecLevel error correction level:
  • QR.ECLEVEL_L Lowest
  • QR.ECLEVEL_M
  • QR.ECLEVEL_Q
  • QR.ECLEVEL_H Highest
• version int QR code version
  • 0 auto
  • 1 ~ 40 manually set

Result

{
  version: 1,
  width: 21,
  data: <SlowBuffer ...>
}

• version int qr code version
• width int qr code width/height
• data Buffer qr code actual data, each byte represent a dot, width * height bytes in total.
  You can use bitwise AND with flags on each byte to extract info for that dot:
  • QR.DOT_BLACK dot is black.
  • QR.DOT_DATA_ECC dot is part of data or ecc code
  • QR.DOT_FORMAT dot is format info
  • QR.DOT_VERSION dot is version info
  • QR.DOT_TIMING dot is part of timing pattern
  • QR.DOT_ALIGN dot is part of alignment pattern
  • QR.DOT_FINDER dot is part of finder pattern
  • QR.DOT_NON_DATA dot is non-data