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.

What is JSON-LD? JSON-LD (JavaScript Object Notation for Linked Data) extends the JSON format to include linking information. The extension has a wide range of uses from knowledge graphs to SEO.

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.