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I'm sorry, but we don't have such feature that would allow you to read a barcode and put it into your form fields.
We only have the following barcode widgets:
http://widgets.jotform.com/widget/qr_code - a widget to add a special message.
http://widgets.jotform.com/widget/dynamic_qr_code - a widget that would get a data from one of your form fields.
http://widgets.jotform.com/widget/qr_code_reader - a widget to read QR codes.