Which Data Type Is Not Part of JSON Standard?


Scott Campbell

Which Data Type Is Not Part of JSON Standard?

JSON (JavaScript Object Notation) is a widely used data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition – December 1999.

Data Types in JSON

In JSON, there are six data types:

  • String: A sequence of characters represented by double quotes.
  • Number: A numeric value that can be an integer or a floating-point value.
  • Boolean: Either true or false.
  • Object: An unordered collection of key-value pairs enclosed in curly braces.
  • Array: An ordered list of values enclosed in square brackets.
  • null: A special value representing null or empty.

The Missing Data Type: Date

Despite its popularity and versatility, JSON does not have a built-in data type for representing dates. This means that if you want to include date values in your JSON data, you need to find an alternative representation or use a custom format.

Possible Solutions:

If you need to include dates in your JSON, here are a few common approaches:

  1. String Representation: You can represent dates as strings using a standardized format such as ISO 8601. For example: “2022-01-01T15:30:00Z”.

    While this approach works well for simple date values, it can become cumbersome when dealing with complex date operations.

  2. Epoch Time: Another option is to represent dates as the number of milliseconds since January 1, 1970 (Unix epoch time). This approach is commonly used in many programming languages and frameworks.
  3. Custom Format: Depending on your specific requirements, you can create a custom format that suits your needs. However, keep in mind that using a custom format may require additional processing or parsing logic on the receiving end.


While JSON offers a wide range of data types for most use cases, it lacks a built-in data type for dates. However, with the help of string representation, epoch time, or custom formats, you can still include date values in your JSON data effectively.

Remember to choose the approach that best fits your application’s requirements and consider how the date values will be handled on both the sending and receiving ends.

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