JavaScript’s built-in objects include Object, JSON, console, String, Math, Date, and the window and global objects. These are some of the most important and useful parts of the JavaScript language.

Introducing JavaScript Object Notation JavaScript Object Notation (JSON) is a lightweight data-interchange format. It is easy for humans to read and write, and easy for machines to parse and generate.

But JSON-LD has all the ingredients for high rankings. In my opinion it makes sense to upgrade to JSON-LD and be on the right side with Google. Read the W3Techs.com survey here.