qrcode-reader
v1.0.4
Published
fork of lazarsoft's jsqrcode for node
Downloads
273,856
Readme
JavaScript QRCode reader for HTML5 enabled browser.
This was started as a port of Lazarsoft’s qrcode reader.
It is a maintained fork, so feel free to open issues or PR !
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(error, result) {
if(error) {
console.log(error)
return;
}
console.log(result)
}
Passing image data in node
You have to use an external imageparser
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); });
You can use
npm install --save image-parser
, which depends on lwip or graphicsmagickvar 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); });
Passing image data in the browser
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 run the tests:
npm test
Make it work in the browser
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.
Changelog
See CHANGELOG.md
.