There's no "standard" format for JSON as it's just a representation of your application's data. You would document it as you would document any of your application's data structures.
JSON is the leading data interchange format for web applications and more. Here’s what you need to know about JavaScript Object Notation. JSON, or JavaScript Object Notation, is a format used to ...
What is JSON (JavaScript Object Notation)? JSON (JavaScript Object Notation) is a text-based, human-readable data interchange format used to exchange data between web clients and web servers. The ...