Built-in JavaScript objects and functions are ones you'll use all the time. Here's how to use Object, JSON, String, Math, Date, and console in your JavaScript programs.

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.