What data types does JSON support?

JSON supports exactly six data types: string, number, boolean, null, object, and array. That small set is deliberate: it keeps JSON simple and portable across every programming language.

{
  "string": "hello",
  "number": 42.5,
  "boolean": true,
  "nothing": null,
  "object": { "nested": "value" },
  "array": [1, 2, 3]
}

The six types explained

• String: text in double quotes: "hello"
• Number: integer or decimal, no quotes: 42, 3.14, -1e10
• Boolean: true or false
• Null: the empty value: null
• Object: key-value pairs in { }
• Array: an ordered list in [ ]

Want to see the types in your own data? Paste it into the tree viewer, or read about JSON syntax rules and JSON objects.