Difference between object instances and JSON files

Question

Its not really pertinent to this course exactly, but I was curious if anyone could give an explanation of the difference between a .js file that would just have essentially a repository of objects and functions, and an actual JSON file?

Answer 1

a. JSON file can be used by any other langage, as a response from a web API, as map or texture for a game, as a value for a web local storage key etc