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NodeJS port of Kang Seonghoon's qr.js

A simple qr library that returns the image as a data URI, packaged as a nodejs module for use on nodejs or with browserify. Requires canvas support.

Originally written by Kang Seonghoon (, and packaged here as a nodejs module with a slightly modified public API.


Install with npm install qruri and call require('qruri')(data[, options ]) to get a data URI.


  • version: an integer in [1,40]. when omitted (or -1) the smallest possible version is chosen.
  • mode: one of 'numeric', 'alphanumeric', 'octet'. when omitted the smallest possible mode is chosen.
  • ecclevel: one of 'L', 'M', 'Q', 'H'. defaults to 'L'.
  • mask: an integer in [0,7]. when omitted (or -1) the best mask is chosen.
  • modulesize: a number. this is a size of each modules in pixels, and defaults to 5px.
  • margin: a number. this is a size of margin in modules, and defaults to 4 (white modules). the specficiation mandates the margin no less than 4 modules, so it is better not to alter this value unless you know what you're doing.


Released under qr.js's original license:

This source code is in the public domain; if your jurisdiction does not recognize the public domain the terms of Creative Commons CC0 license apply. In the other words, you can always do what you want.