What data types does JSON support?

Question

Accepted Answer

JSON supports exactly six value types: strings, numbers, booleans, null, objects, and arrays.

Type
Example
Notes

String
"hello"
Must use double quotes

Number
42, 3.14
No quotes needed

Boolean
true, false
Lowercase

Null
null
Represents empty/missing

Object
{"key": "value"}
Nested structures

Array
[1, 2, 3]
Ordered lists

Not supported:

undefined - use null instead
Date - store as string: "2023-10-15"
Functions - not serializable
Comments - not allowed

Example with all types:
{
    "name": "John",
    "age": 30,
    "active": true,
    "spouse": null,
    "hobbies": ["reading", "coding"]
}