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Scan barcodes and QR codes using this plugin for mobile apps

Implements qrcode.js Cross-browser QRCode generator for javascript

Pure JavaScript QR Code Generator – QRious

Server side creation of QR codes in PNG, SVG image or PDF file format.

A simple QR Code generator to your application.

This is a cross-platform JavaScript library to integrate QR code, bar codes & a few other types of code scanning capabilities to your applications running on HTML5 compatible browser.

Supports all mobile browsers and web browsers which supports HTML 5.

Supports:

Querying camera on the device (with user permissions)
Rendering live camera feed, with easy to use user interface for scanning
Supports scanning a different kind of QR codes, bar codes and other formats
Supports selecting image files from the device for scanning codes

Derived from this GitHub Code,
https://github.com/mebjas/html5-qrcode

A JavaScript library that generates customizable QR codes using plain JavaScript and HTML5 canvas. It is completely written in JavaScript with no third-party libraries like jQuery. It is lightweight, it has a flexible API, and it can be easily customized to your needs.

Add enterprise-grade 1D/2D barcode scanning capabilities to your web apps using STRICH.
Supports all popular symbologies like EAN/UPC, Code 128, QR, Data Matrix and others.

STRICH is commercial software. A license key is required for this asset. Start your free 30-day trial today!
Read more at: https://strich.io

QR code API
You can generate QR code graphics with QR code generator web API at api.qrserver.com.

http://goqr.me/api/doc/create-qr-code/

A simple service to generate QR code based on the text provided.