This project is no more maintained. Explanation : Lazarsoft's qrcode reader is not maintained since 2 years, so I decided to fork it one year ago to fix some issues. However, there are many things missing on this project, such as proper test cases. Also, I still haven't had the time to understand how the qrcode processing really works under the hood. On the other side, a new library called : https://github.com/cozmo/jsQR exists for over a year, is maintained and has multiple test cases. I have personally moved to this library instead.

I'm letting the README as it was before below.

This was started as a port of Lazarsoft’s qrcode reader.

npm install qrcode-reader

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(error, result) {
  if(error) {
    console.log(error)
    return;
  }
  console.log(result)
}

You have to use an external imageparser

1. You can use npm install --save jimp which doesn't have any dependency (runs in pure node).

   var Jimp = require("jimp");
   var buffer = fs.readFileSync(__dirname + '/image.png');
   Jimp.read(buffer, function(err, image) {
       if (err) {
           console.error(err);
           // TODO handle error
       }
       var qr = new QrCode();
       qr.callback = function(err, value) {
           if (err) {
               console.error(err);
               // TODO handle error
           }
           console.log(value.result);
           console.log(value);
       };
       qr.decode(image.bitmap);
   });

2. You can use npm install --save image-parser, which depends on lwip or graphicsmagick

   var ImageParser = require("image-parser");
   var buffer = fs.readFileSync(__dirname + '/image.png');
   var img = new ImageParser(img);
   img.parse(function(err) {
       if (err) {
           console.error(err);
           // TODO handle error
       }
       var qr = new QrCode();
       qr.callback = function(err, value) {
           if (err) {
               console.error(err);
               // TODO handle error
               return done(err);
           }
           console.log(value.result);
           console.log(value);
       };
       qr.decode({width: img.width(), height: img.height()}, img._imgBuffer);
   });

Since the browser contains the Image global, we can use it to open images with URL, Data URI, ...

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);

====================

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 build

To minify dist/index.js and generate dist/index.min.js you should run:

npm run minify

To run the tests:

npm test

The generated file dist/index.js works in the browser.

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

```

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

See CHANGELOG.md.