iOS Programming: The Big Nerd Ranch Guide, 7th Edition

JSON Data

JSON data, especially when it is condensed like it is in your console, may seem daunting. However, it is actually a very simple syntax. JSON can contain the most basic types used to represent model objects: arrays, dictionaries, strings, numbers, Booleans, and null (nil). JSON dictionaries must have keys that are strings, but the values can be any other JSON type. Finally, arrays can contain any JSON type. Thus, a JSON document is a nested set of these types of values.

Here is an example of some really simple JSON:

    {
        "name" : "Christian",
        "friends" : ["Stacy", "Mikey"],
        "job" : {
            "company" : "Big Nerd Ranch",
            "title" : "Senior Nerd"
        }
    }

This JSON document begins and ends with curly braces ({ and }), which in JSON ...