Online store in the form of a js-plugin. How? Meaning?

Question

JavaScript

There is a plugin that displays a given store structure.
All store information is stored in json format. Now it is simply passed as a parameter to an instance of the class.

There is also a page with creating a store structure. How to implement the saving of this information on the server?
How to change it in this case already in the store itself? For example, when a product is issued and you need to reduce its quantity in the array.

I would also like to implement the ability to take a step back with backspace. For this, as I understand it, you need ssr?

And in general, what do you think about the idea of ​​​​creating such a plugin?
Its main feature is that it connects as simply as any slider.

Answer 1

In fact, the store consists of several components:

1. Database with DBMS - for transactions.
   
2. CGI scripts or other software part that converts requests from the client into SQL queries to the DBMS.
   
3. Client side - HTML and JS. Separately - for buyers, for employees, for administrators: each has its own system. However, their CGI scripts are also likely to be different.
   

"An online store in the form of a js-plugin" does not happen without something additional.