while JSON is a generalized data structure with support for various data types supported by programming languages
Honestly, I find it surprising that you say “support for various data types supported by programming languages”. Data types are particularly weak in JSON when you go beyond JavaScript. Only number for numbers, no integer types, no date, no time, etc.
Regarding use, I see, at least to some degree, JSON outside of use for network transfer. For example, used for configuration files.