Understanding JSON Objects: Structure, Syntax, and Data Types

Learn the fundamentals of JSON objects, a key data structure in JSON (JavaScript Object Notation). This tutorial explains the structure of JSON objects (key-value pairs), supported data types (string, number, boolean, array, nested objects), and provides clear examples to solidify your understanding of JSON syntax.

Understanding JSON Objects

What is a JSON Object?

A JSON object is a collection of key-value pairs. Each key is a string (enclosed in double quotes), and each value can be a string, number, boolean, array, or another JSON object (allowing for nested objects). Objects are enclosed in curly braces {}, and key-value pairs are separated by colons (:) and commas (,).

JSON Object Examples

Here are some examples demonstrating different data types within a JSON object:

Simple JSON Object

{
  "employee": {
    "name": "sonoo",
    "salary": 56000,
    "married": true
  }
}

This shows a nested object; the "employee" is an object itself, containing key-value pairs for name, salary (a number), and marital status (a boolean).

JSON Object with Strings

{
  "name": "sonoo",
  "email": "sonoojaiswal1987@gmail.com"
}

JSON Object with Numbers

{
  "integer": 34,
  "fraction": 0.2145,
  "exponent": 6.61789e+0
}

JSON Object with Booleans

{
  "first": true,
  "second": false
}

Nested JSON Object

{
  "firstName": "Sonoo",
  "lastName": "Jaiswal",
  "age": 27,
  "address": {
    "streetAddress": "Plot-6, Mohan Nagar",
    "city": "Ghaziabad",
    "state": "UP",
    "postalCode": "201007"
  }
}