JSON-structure of a real-world application

JSON hash

The JSON structure is a universal way to describe almost any data. For example, the following hash represents the state of a user interface (UI) of a minimalist to-do list application:

{
  todos: [{
    text: 'Eat donut',
    completed: true
  }, {
    text: 'Go to gym',
    completed: false
  }],
  visibility_fiter: :show_completed
}

The UI part of the application may look like this: