JSON Syntax

The JSON Syntax contains the next elements:

• data is represented in key/value pair separated by colon (:) key : value
• comma (,) separates the key/value pairs key : value , key : value
• object groups multiple key/value pairs and are held by curly brackets ({}) { key : value , key : value }
• arrays group multiple objects separated by comma (,) and are held by square brackets ([]) [ { key : value , key : value },{ key : value , key : value } ]

Depending on the data type, you could need to write the key and values in double quotes.

JSON Example

{
   "city": [

      {
         "id": 1,
         "name": "Zaragoza",
         "country": "Spain",
         "population": 680000
      },

      {
         "id": 2,
         "name": "Bristol",
         "country": "England",
         "population": 550000
      }

   ]
}

Data Types

In JSON, values must be one of the next data types:

• Number : double precision floating-point format
• String : double quoted (“) Unicode
• Boolean : true or false
• null

If you need to include functions, dates, or undefined values, you cannot use JSON. See JSON vs XML page to find out more.