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Introduction To JSON

In this tutorial we will discuss about the basics of JSON.

What Is JSON

JSON (JavaScript Object Notation) is a light-weight data exchange format (just like XML).

JSON data starts with ‘{‘and ends with ‘}’.

{"key_name":"value"}

JSON supports following data types

Let us discuss each data type

String is a sequence of Unicode characters enclosed in double quotes. For example

{"name":"gyansangrah"}

Here ‘var’ is the key name and ‘Test’ is the value.

Numbers are the data type that represents quantity or amount. Numbers are not enclosed in double quotes. For example

{"my_num":12}

Objects like person are represented in JSON as

{Person: 
{"Name":"gyansangrah",
"age" :8
}}

Array starts with ‘[‘ and ends with ‘]’

{students:["Karan","Anurag", "Ritesh"]}

Boolean values are represented as true or false.

{"IsApplicable":"True"}
              Or
{"IsApplicable":"False"}

NULL data type represents null value

{ "middlename":null }

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