The following devices will allow you to save locally and use a pure JSON file:

• EtherScope nXG
• CyberScope
• CyberScope Air
• AirCheck G3
• LinkRunner 10G
• LinkRunner G2
• LinkRunner AT 3000/4000

1. There are several JSON to CSV apps out there. You can use https://json-csv.com/ to convert it and loaded it into Excel.
2.  Likewise Excel has an import JSON feature with lots of power builder features.
3.  There is an added chrome extension for JSON viewing. Extension https://chrome.google.com/webstore/detail/json-viewer/gbmdgpbipfallnflgajpaliibnhdgobh/related?hl=en-US
4.  Also you can save a screen shot using the JSON viewer on the unit.