JSON

JavaScript Object Notation (JSON) is exactly what the name implies -- it is representing data as JS Objects. Therefore JSON syntax is identical to the object syntax.

// JSON Syntax
{
    property_1:   value_1,   // property_# may be an identifier...
    2:            value_2,   // or a number...
    // ...,
    'property n': value_n   // or a string
}; 

In practice JSON is a file that holds the string that defines the JS Object.

To make it easy to work with JSON, JS Intepretors have a build in JSON Object. It has two important static methods -- JSON.parse() and JSON.stringify() that allow to parse a JSON String into an Object and vice-versa respectively.

var obj = {
  name: "Jane Doe",
  classes:[ "Programming the Web", "Database Management", "Operating Systems"],
  school: "ABC Academy" 
}

var jsonString = JSON.stringify(obj); 
  // '{"name":"Jane Doe","classes":["Programming the Web","Database Management","Operating Systems"],"school":"ABC Academy"}'

var objCopy = JSON.parse(jsonString); 

JSON is strictly a data-interchange format, and can hold any data-type with the exception of functions.