Which Data Type Is Supported by JSON?


Heather Bennett

JSON (JavaScript Object Notation) is a popular data interchange format used for transmitting and storing data. It is widely supported by various programming languages due to its simplicity and ease of use. In this article, we will delve into the different data types supported by JSON and explore how they can be utilized.

JSON Data Types:

JSON supports six main data types:

1. String:
A string represents a sequence of characters enclosed within double quotes.

It can contain letters, numbers, and special characters. For example: “Hello World”, “12345”, or even “Special Characters: ! @#$%^&*”.

2. Number:
A number in JSON can be an integer or a floating-point value.

Unlike strings, numbers do not require quotation marks around them. For example: 42, -12, or 3.14.

3. Boolean:
JSON supports two boolean values: true and false. These values are case-sensitive and do not require quotation marks around them.

4. Object:
An object is an unordered collection of key-value pairs enclosed within curly braces {}.

Each key is followed by a colon (:), separating it from its corresponding value. Multiple key-value pairs are separated by commas (,). For example:

“name”: “John Doe”,
“age”: 30,
“isStudent”: false

5. Array:
An array represents an ordered list of values enclosed within square brackets [].

Values in an array can be of any JSON data type, including other arrays or objects if needed. Values are separated by commas (,). For example:

[“apple”, “banana”, “orange”]

6. Null:
The null value represents the absence of any value or unknown information in JSON.

JSON Data Type Example:

Let’s explore a practical example that demonstrates the usage of different data types in JSON. Suppose we want to represent information about a person:

“name”: “John Doe”,
“age”: 30,
“isStudent”: false,
“skills”: [“HTML”, “CSS”, “JavaScript”],
“address”: {
“street”: “123 Main Street”,
“city”: “New York”,
“country”: “USA”
“contactNumbers”: [
{“type”: “home”, “number”: “+1-123-456-7890”},
{“type”: “work”, “number”: “+1-987-654-3210”}
“previousEmployers”: null

In this example, we have utilized various JSON data types. The name, age, and isStudent properties are strings, number, and boolean respectively. The skills property is an array containing strings.

The address property is an object with nested key-value pairs representing the person’s address. The contactNumbers property is an array of objects with two properties: type and number. Lastly, the previousEmployers property is set to null.


JSON supports a range of data types including strings, numbers, booleans, objects, arrays, and null values. Understanding these data types is essential when working with JSON in different programming languages or when exchanging data between systems. By utilizing the appropriate data types in your JSON structures, you can ensure accurate representation and seamless communication of your data.

Overall, JSON provides a flexible and straightforward approach to handle diverse data structures while maintaining compatibility across platforms and programming languages.

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