JSON

JSON syntax is a subset of the JavaScript object notation:

Summary:

• A collection of name/value pairs. - Object/associative array.
• An ordered list of values. Array

Data is in name-value pairs

{
    "company": Volkswagen
}

• Data is separated by commas

    {
        "company": "Volkswagen",
        "name": "Beetle"
    }
  

• Curly braces hold objects

• Square brackets hold arrays

    {
        "company": "Volkswagen",
            "Cars": [{
                "Color": "Red",
                "Color": "Grey",
                "Color": "Yellow"
            }]
    }
  

Object

An object is an unordered set of name/value pairs. An object begins with { (left brace) and ends with } (right brace). Each name is followed by : (colon) and the name/value pairs are separated by , (comma).

Array

An array is an ordered collection of values. An array begins with [ (left bracket) and ends with ] (right bracket). Values are separated by , (comma).

Value

A value can be a string in double quotes, or a number, or true or false or null, or an object or an array.

These structures can be nested.

String

A string is a sequence of zero or more Unicode characters, wrapped in double quotes, using backslash escapes. A character is represented as a single character string. A string is very much like a C or Java string.

Number

A number is very much like a C or Java number, except that the octal and hexadecimal formats are not used.

Javascript and JSON

var mike = {
    "age" : "24",
    "hometown" : "Bryrup",
    "gender" : "male"
};

document.write('Mike is ' mike.age); // Output: Mike is 24