KlvInjector application comes with the KlvMonitor that can be useful for real time data preivew.

You can inspect Klv packets in a JSON mode by opening a special JSON view window.

There are two modes:

Compact - only tags are used and the values are in a native form.
Detailed - tags and names are shown. Values are in a "more" human readable format.

JSON View (brief)

Packet can be saved to disk or loaded directly into the Json View window.