Is it possible to add a barcode reader in my form?

Es posible. Ponerle a la aplicación un lector de códigos de barras.

Hi greivin_cr,

Thanks for reaching out to Jotform Support. Unfortunately, our Spanish Support agents are busy helping other Jotform users at the moment. I'll try to help you in English using Google Translate, but you can reply in whichever language you feel comfortable using. Or, if you'd rather have support in Spanish, let us know and we can have them do that. But, keep in mind that you'd have to wait until they're available again.

Now, let me help you with your question. Yes, you can use our free Barcode Scanner widget which allows users to scan barcodes directly through your online form. Users can use their smartphone, tablet, or desktop camera to scan their item’s barcode or upload a photo. You can check our demo form here.

As for your other question, I've moved that to a new thread. You can check that out here.

Let us know if you need any more help.