JavaScript JSON Data Types

Valid Data Types

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 values cannot be one of the following data types:

• a function
• a date
• undefined

JSON Strings

Strings in JSON must be written in double quotes.

JSON Numbers

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

JSON Objects

Values in JSON can be objects. Objects as values in JSON must follow the JSON syntax.

JSON Arrays

Values in JSON can be arrays.

JSON Booleans

Values in JSON can be true/false.

JSON Null

Values in JSON can be null.