There are a lot of people who store JSON in NoSQL databases. After fetching a JSON records you generally view the JSON or you do as a developer. That is where the tool is handy as you get get something like a FHIR record on a single page instead of crunched into a single line to expanded over multiple pages.
JSON is mostly for people and not machines in that it is meant to be easily readable and editable by humans. If you wanted a something for machines you would store your data in a compressed/binary format.