JSON Basics

This post is a part of our How to begin with API Testing series. In this post, I will be covering JSON Basics.

What is JSON:

Like XML, JSON is also a communication format used for sharing data between multiple applications. JSON stands for JavaScript Object Notation. It is basically collection of key-value pair.

JSON can be used in following ways:

  • JSON Object: 

Below Object has 3 key-value pairs

    { "firstName" : "Vijay", "lastName" : "Gupta", "gender" : "Male" }





  • JSON Array

Below array has 3 JSON Objects with 3 key-value pairs each


{"name" : "Potato","stock" : "10", "unit" : "kg"},

{"name" : "Tomato","stock" : "32", "unit" : "kg"},

{"name" : "Onion","stock" : "27", "unit" : "kg"}




JSON Syntax Rules:

  • Data is represented in name/value pairs.
  • Name and Value are delimited / separated by colon (:)
  • Each Name / Value pair are separated by , (comma)
  • Curly braces hold objects
  • Square brackets hold arrays
  • Each JSON Object in array  are separated by ,(comma)

Nested JSON Objects:

JSON Objects can be nested also:


"id": "0001", "type": "donut", "name": "Cake",


{ "url": "images/0001.jpg", "width": 200, "height": 200},


{"url": "images/thumbnails/0001.jpg", "width": 32, "height": 32}




Origin 1998 2006
Ancestor SGML JavaScript
Verbose More Less
Arrays No Yes
Namespace Support Yes No
File Format .xml .json
Display Capabilities Yes No
Orientation Document Oriented Data Oriented

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