Lesson: 02 | JSON Data Types

Notes
Video

Notes

In JSON, values must be one of the following data types:

a string
a number
an object (JSON object)
an array
a boolean
null

JSON Strings

Strings in JSON must be written in double quotes.

{"make": "Tesla"}

JSON Numbers

Numbers in JSON must be an integer or a floating point.

{"year": 2022}

JSON Objects

Values in JSON can be objects.

{
  "car": {
    "make": "Tesla",
    "model": "Model 3",
    "year": 2022,
    "color": "red"
  }
}

JSON Arrays

Values in JSON can be arrays.

{
  "employees": [
    "John",
    "Anna",
    "Peter"
  ]
}

JSON Booleans

Values in JSON can be true/false.

{"active":true}

JSON null

Values in JSON can be null.

{"middlename":null}

Example

{
  "title": "The Great Gatsby",
  "author": "F. Scott Fitzgerald",
  "publication_year": 1925,
  "isbn": "9780743273565",
  "publisher": {
    "name": "Scribner",
    "location": "New York"
  },
  "genres": ["Fiction", "Classic", "Literary"],
  "ratings": {
    "average": 4.2,
    "count": 150
  },
  "is_available": true
}

In this example:

"title" represents the title of the book, which is set to "The Great Gatsby".
"author" represents the author of the book, which is set to "F. Scott Fitzgerald".
"publication_year" represents the year the book was published, set to 1925.
"isbn" represents the unique identifier of the book, set to "9780743273565".
"publisher" is an object containing information about the publisher, including "name" ("Scribner") and "location" ("New York").
"genres" is an array of strings representing the genres the book belongs to: "Fiction", "Classic", and "Literary".
"ratings" is an object containing information about the book's ratings, including the "average" rating of 4.2 and the total "count" of 150 ratings.
"is_available" is a boolean value indicating whether the book is available, set to true

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01 | JSON - Introduction

02 | JSON Data Types

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