JSON Data Types

JSON (JavaScript Object Notation) is the most widely used data format for data interchange on the web. JSON is a lightweight text-based, data-interchange format and it is completely language-independent.

JSON Data Types

JSON supports mainly 6 data types:  

1. String
2. Number
3. Boolean
4. Null
5. Object
6. Array

Note: string, number, boolean, null are simple data types or primitives data types whereas object and array are referred as complex data types. 

JSON String

JSON strings must be written in double quotes like C-language there are various special characters(Escape Characters) in JSON that you can use in strings such as \ (backslash), / (forward slash), b (backspace), n (new line), r (carriage return), t (horizontal tab), etc. 

{ "name":"Vivek" }
{ "city":"Delhi\/India" }

here \/ is used for Escape Character / (forward slash).

JSON Number

Represented in base 10 and octal and hexadecimal formats are not used. 

{ "age": 20 }
{ "percentage": 82.44}

JSON Boolean

This data type can be either true or false. 

{ "result" : true }

JSON Null

It is just a define nullable value. 

{
  "result" : true,
  "grade" : null,
  "rollno" : 210
}

JSON Object

It is a set of name or value pairs inserted between {} (curly braces). The keys must be strings and should be unique and multiple key and value pairs are separated by a, (comma).

{
"Geek":{ "name":"Peter", "age":20, "score": 50.05}
}

JSON Array

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

{
"geek":[ "Sahil", "Vivek", "Rahul" ]
}

{
  "collection" : [
        {"id" : 101},
        {"id" : 102},
        {"id" : 103}
  ]
}