granite-qrcode-decoder | Vaadin

An element to decode a QR Code from an image

[ This description is mirrored from at on 2019-05-22 ]

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An element to decode a QR Code from an image. using a modified version of Lazersoft's jsqrcode library, to allow jsqrcode to deal with ShadowDOM

Built on lit-element

The old Polymer 2.x-1.x version is available on the polymer-hybrid branch.

Doc & demo

The element can decode several sources of images:

  • A dataURL, by using the dataUrl property
  • An app-media-image-capture, by injecting it to the blob property
  • A canvas, by calling the decodeCanvas method passing the canvas as parameter

Usage example



Install the component using npm:

$ npm i @granite-elements//granite-qrcode-decoder

Once installed, import it in your application:

import '@granite-elements/granite-qrcode-decoder/granite-qrcode-decoder.js';

Running demos and tests in browser

  1. Fork the granite-qrcode-decoder repository and clone it locally.

  2. Make sure you have npm and the Polymer CLI installed.

  3. When in the granite-qrcode-decoder directory, run npm install to install dependencies.

  4. Serve the project using Polyumer CLI:

    polymer serve --npm

  5. Open the demo in the browser


  1. Fork it!
  2. Create your feature branch: git checkout -b my-new-feature
  3. Commit your changes: git commit -m 'Add some feature'
  4. Push to the branch: git push origin my-new-feature
  5. Submit a pull request :D


MIT License


Link to this version
ImportedReleased 04 March 2018Other
Framework Support
Polymer 2.0+
Browser Independent
Install with
Release notes - Version 1.0.2



  • LostInBrittany/jsqrcode#^1.0.1
  • LostInBrittany/granite-js-dependencies-grabber#^1.1.0