JSON Data Types

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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.

Example #

{ "name":"John" }

JSON Numbers #

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

Example #

{ "age":30 }

JSON Objects #

Values in JSON can be objects.

Example #

{ "employee":{ "name":"John", "age":30, "city":"New York" } }

Objects as values in JSON must follow the same rules as JSON objects.

JSON Arrays #

Values in JSON can be arrays.

Example #

{ "employees":[ "John", "Anna", "Peter" ] }

JSON Booleans #

Values in JSON can be true/false.

Example #

{ "sale":true }

JSON null #

Values in JSON can be null.

Example #

{ "middlename":null }
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