Generally, they are used as backup files. JSON files are used to store data and transmit it between the server and web applications. They may mark it as an unidentified file type as they may lack a built-in app that is able to read it. However, mainstream operating systems like Windows, Android, etc may often trouble users in identifying the JSON format. Thus, JSON is often used as an XML alternative. It is also supported by many programming APIs. Earlier, JSON was JavaScript subset-based but now, it is looked upon as a format that is independent of the language.
A very common use of JSON files is to take backup of data that is able to be restored back to the program when required.
