What Data Type Is Part of the JSON Standard?


Larry Thompson

The JSON (JavaScript Object Notation) standard is widely used for data exchange between web applications and servers. It provides a lightweight and easy-to-read format for transmitting structured data, making it a popular choice in modern web development. In JSON, data is represented using key-value pairs, similar to objects in JavaScript.

Data Types in JSON:
JSON supports six main data types: strings, numbers, booleans, null values, arrays, and objects. Let’s take a closer look at each of these data types:


Strings are sequences of characters enclosed within double quotes. They can contain any Unicode character except for the control characters (such as backspace or null). Strings are commonly used to represent textual data like names, addresses, or descriptions.


Numbers in JSON are represented similarly to how they are represented in most programming languages. They can be integer or floating-point values. However, note that JSON does not support special numeric values like NaN or Infinity.


Boolean values in JSON can be either true or false. These values represent logical conditions and are often used for binary choices like enabling/disabling a feature or indicating a state.

Null Values:

The null value is used in JSON to represent an empty value or absence of any value. It is often used when there is no meaningful information to provide for a particular field.


Arrays in JSON are ordered lists of values enclosed within square brackets []. The values can be of any valid JSON type and separated by commas. Arrays allow grouping related data together and provide an ordered collection of items.

Here’s an example of an array containing different types of data:

  • [“John Doe”, 25, true, null]


Objects in JSON are unordered collections of key-value pairs enclosed within curly braces {}. The keys must be strings, and the values can be of any valid JSON type. Objects are used to represent complex structures and allow organizing related data into logical groups.

Here’s an example of an object containing different types of data:

  • {“name”: “John Doe”, “age”: 25, “isStudent”: true, “address”: null}


Understanding the different data types supported by the JSON standard is essential for working with JSON data effectively. Whether you’re parsing JSON or creating JSON objects, being familiar with these data types allows you to manipulate and utilize the data in a meaningful way. Remember to use the appropriate data type for each value when working with JSON to ensure consistency and accuracy.

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