Valid Data Types in JSON

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"}

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JSON Numbers

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

Example

{"age": 30}

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JSON Objects

Values in JSON can be objects.

Example:

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

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Objects as values in JSON must follow JSON syntax.

JSON Arrays

Values in JSON can be arrays.

Example:

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

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JSON Booleans

Values in JSON can be true or false.

Example:

{"sale": true}

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JSON null

Values in JSON can be null.

Example:

{"middlename": null}

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