How to build a scanner in Now Agent mobile app to scan bulk assets and create a record in table?

[Aloke Das]

I have a requirement to build a scanner in Now Agent app to scan bulk assets which should create a record and should not duplicate the record if its already present in the table. 

[ChrisBurks]

When you say scanner to you mean something like a barcode or QR code reader?

[Aloke Das]

Yes QR/Barcode Scanning.

[Aloke Das]

I need to scan bulk qr/barcodes at a time and then review and submit all the assets at the same time.

[ChrisBurks]

I've never used them, but I know there are some MIT Licensed (you can freely use commercially or not) JavaScript libraries for barcode/qr code reading:
1. QuaggaJS - https://github.com/serratus/quaggaJS

2. ZXing - https://github.com/zxing/zxing

You might be able to pull one of these into ServiceNow