JavaScript QRCode reader for HTML5 enabled browser.

This is a port of Lazarsoft’s qrcode reader

Installation

npm install qrcode-reader

Usage

var QrCode = require('qrcode-reader');

Create a new instance of QrCode:

var qr = new QrCode();

Set its callback to a custom function:

qr.callback = function(result,err) { if(result) console.log(result) }

Decode an image by its URL or Data URI:

qr.decode(url or DataURL);

Decode an image by context.getImageData: Works with web workers.

var context = canvas.getContext("2d");
var data = context.getImageData(0, 0, width, height);

qr.decode(data);

Decode from canvas with "qr-canvas" ID:

qr.decode()

Building it yourself

If you want, you can build the script yourself.

First clone the repository, then from the directory of this repository, do:

npm install

To run the build process and generate a JavaScript file called dist/index.js you can run from node:

npm run compile

To run the tests:

npm test

Make it work in the browser

If this module was installed from the npm registry, it will already contain a dist/browser.js. Otherwise, it has to be built manually (after running npm install, see above):

npm run compile:browser

You will have access to the global variable QrCode if you do the following in your HTML:

<script src="dist/browser.js"></script>

See examples/browser-upload/index.html for a very basic example using a file upload.