JSON Data Types

JSON has a simple set of data types that are easy to understand and widely supported. These data types allow you to structure and represent various kinds of data in a clear and consistent way.

The following table describes each of the data type in JSON with examples.

Data TypeDescriptionExample
StringText enclosed in double quotes"name": "Alice"
NumberNumeric values (integer or floating)"age": 25
BooleanLogical values: true or false"isStudent": true
NullRepresents no value"middleName": null
ObjectKey-value pairs inside {}"address": {...}
ArrayOrdered list of values inside []"hobbies": ["read", "travel"]
Data types in JSON

The following diagram shows different data types in a JSON Object.

JSON Data Types

Let us see about each of these data types in a bit detail manner.

1. String

  • Represents textual data.
  • Enclosed in double quotes ("").
  • Can contain letters, numbers, and special characters.

Example:

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"name": "Arjun"

More about JSON Strings.

2. Number

  • Represents numeric data.
  • Can be an integer or a floating-point number.
  • No quotes are used around numbers.

Example:

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"age": 30
"height": 5.8

More about JSON Numbers.

3. Boolean

  • Represents a truth value.
  • Can only be true or false (without quotes).

Example:

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"isMarried": false

More about JSON Boolean.

4. Null

  • Represents the absence of a value.
  • The value is written as null (without quotes).

Example:

More about JSON Null.

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"middleName": null

5. Object

  • Represents a collection of key-value pairs.
  • Enclosed in curly braces {}.
  • Keys must be strings, and values can be any valid JSON data type.

Example:

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"address": {
  "street": "123 Main St",
  "city": "New York",
  "zipCode": 10001
}

More about JSON Objects.

6. Array

  • Represents an ordered list of values.
  • Enclosed in square brackets [].
  • Can contain any combination of JSON data types.

Example:

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"skills": ["JavaScript", "Python", "SQL"]

More about JSON Array.