Which Is Not the Built in Data Type of JSON?


Larry Thompson

JSON, which stands for JavaScript Object Notation, is a lightweight data interchange format. It is widely used for transmitting data between a server and a web application as an alternative to XML.

JSON is based on key-value pairs and supports various data types such as strings, numbers, booleans, arrays, objects, and null. However, there is one data type that is not built into JSON – Date.

JSON Data Types

  • String: A sequence of characters enclosed in double quotes.
  • Number: An integer or a decimal value.
  • Boolean: Either true or false.
  • Array: An ordered list of values enclosed in square brackets.
  • Object: A collection of key-value pairs enclosed in curly braces.
  • Null: Represents the absence of any value.

The Missing Data Type – Date

In JSON, you can represent dates as strings using a predefined format such as ISO 8601. For example:

  "birthdate": "1990-01-01"

This way, you can easily transmit date information from the server to the client or vice versa. However, JSON does not have a built-in data type specifically for dates like some other programming languages.

Working with Dates in JSON

To work with dates in JSON, you need to convert them to strings using a specific format and parse them back into date objects when needed. This conversion process depends on the programming language or framework you are using.

For example, in JavaScript, you can use the Date object’s methods like .toISOString(), .toJSON(), or custom formatting functions to convert dates to strings in a specific format. When you receive a date string from JSON, you can parse it back into a JavaScript Date object using the Date constructor or parsing methods like .parse().

Third-Party Libraries

If you find yourself working extensively with dates in JSON, you might consider using third-party libraries specifically designed for handling dates and times. These libraries provide additional functionality and make working with dates in JSON more convenient.

Some popular date libraries for JavaScript include Moment.js, Luxon, and Date-fns. These libraries offer features like date parsing, formatting, manipulation, and timezone support.


JSON is a versatile data interchange format that supports various data types. However, it does not have a built-in data type specifically for dates.

Dates can be represented as strings using a specific format and converted back into date objects when needed. If you frequently work with dates in JSON, utilizing third-party date libraries can simplify your workflow.

To summarize, the missing built-in data type of JSON is Date. Understanding this limitation will help you handle dates effectively when working with JSON in your web applications.

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