JSON

JSON is a standart format used to transfer data over the network. JSON is pretty much just JavaScript object literals with a few reasonable restrictions, such as:

• you must use quotation marks for JavaScript object keys;
• valid values for a given key can only be a string, number, boolean (true or false), array, null, or another valid JSON object;
• the last property must not have an extra comma:

// Invalid JSON
{
  "foo": "123",
  "bar": "123",
}
// Valid JSON
{
  "foo": "123",
  "bar": "123"
}

Example of a valid JSON object

{
  "firstName": "John",
  "lastName": "Smith",
  "isAlive": true,
  "age": 25,
  "height_cm": 167.64,
  "address": {
    "streetAddress": "21 2nd Street",
    "city": "New York",
    "state": "NY",
  },
  "phoneNumbers": [
    { "type": "home", "number": "212 555-1234" },
    { "type": "fax", "number": "646 555-4567" }
  ],
 "additionalInfo": null
}