How to use JSON Data Types?

A JSON body can comprise one of 6 data types which can be categorized as primitive or complex data types.

JSON Data Type

• String (Primitive)
• Number(Primitive)
• Object (Complex)
• Array (Complex)
• Boolean (Primitive)
• Null (Primitive)

1. String

In JSON, keys must always be strings. Any string is always written in double quotes.

Example

{
  "name": "apitier"
}

2. Number

The number represents the numeric characters. Number values must be integer or floating-point numbers. A floating-point number is a number with a decimal point value such as; 0, 3.11, 7.3, and -109.5.

Example

{
  "age": 50
}

{ 
   "percentage": 80.55 
}

3. 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 keys and value pairs are separated by a, (comma). 

Syntax

{ key : value, .......}


Example

{
  "user": {
    "name": "apitier",
    "age": 50,
    "percentage": 60.05
  }
}

4. Array

The array is a list of objects, which are mainly enclosed in square brackets [ ]. In JSON, the array value can be a string, number, object, array, boolean or null.

Syntax

[ value, .......]

Example

{
  "apitier": [
    "postcode",
    "address",
    "post_town"
  ]
}


{
   "addresses": [
      {
        "line_1": "House Of Commons",
        "line_2": "Houses Of Parliament",
        "line_3": "",
        "post_town": "LONDON",
        "postcode": "SW1A 0AA",
        "address": "House Of Commons, Houses Of Parliament, LONDON, SW1A 0AA"
      }
    ]
}

5. Boolean

This data type can be either true or false. 

Example

{ 
  "result" : true 
}

6. Null

It is just a defined nullable value(empty value).

Example

{
  "result" : true,
  "grade" : null,
  "no" : 210
}