Serializing D to JSON and back

With the RESTful approach, the client and server exchange messages using the HTTP protocol. Of the many possible data formats, JavaScript Object Notation (JSON) is used. Originally, JSON was based on a subset of JavaScript. It has basic data types for numbers, strings, and Booleans. Like JavaScript, it uses two different structures to create complex data:

• A collection of key/value pairs called an object in JSON. This is like an associative array in D and can be used to represent objects, maps, and so on. The key/value pairs are surrounded by { and }.

• An ordered list of values called an array in JSON. The values are surrounded by [ and ].

The format is written in JavaScript. Once properly formatted, this is easily readable. A list of notes could look as follows:

[
  { "id":1, "topic":"Topic 1", "content":"Content 1" },

  { "id":2, "topic":"Topic 2", "content":"Content 2" }
]

A single note is the key/value collection in { }. The list consists of the enumerated notes...