Created a small app last night to read barcodes.
Nothing fancy. Just a button to invoke the barcode reader camera and then returns the barcode number along with the barcode standard.
You can get it here:
Checked on iPhone 5S and Android Kit Kat.
I am only using an html file and a js file along with the config.xml.
You can get the code from my github repository. You can remove the resource files from config.xml. I just got it from the base template.
To add the plugin , in Config.xml you need to have: <gap:plugin name=”com.phonegap.plugins.barcodescanner”/>