JSON Types

Defines a type that describes any allowable JSON value, which basically means:

• A JSON value MUST be an
  • object
  • array
  • number
  • string
  • boolean
• Or one of the following three literal names:
  • false
  • true
  • null
• Can NOT be any of the following:
  • function
  • undefined
  • BigInt
  • class

The trick is to use Recursive types

type JSONPrimitive = string | number | boolean | null;
type JSONObject = { [key: string]: JSONValue };
type JSONArray = JSONValue[];
type JSONValue = JSONPrimitive | JSONObject | JSONArray;

From the TypeScript Fundamentals, v3↗ course on FEM↗ taught by Mike North↗.