Data types

Key and value

Basically means this:

key: value

Note that keys are always Strings, while values may be any value listed here.

Primitive values

Type	Size	Annotation	Example
Byte	8 Bit	Numeric value from -128 to 127	key: 64
Short	16 Bit	Numeric value from -32,768 to 32,767	key: 367
Integer	32 Bit	Numeric value from -2^31 to 2^31-1	key: 5000
Long	64 Bit	Numeric value from -2^63 to 2^63-1	key: 1525199972497
Float	32 Bit	Decimal number	key: .23
Double	64 Bit	Decimal number (may be large af)	key: 5430.674343
Boolean	1 Bit	True / false value	key: true

String

A String is a sequence of characters. Since some values break the YAML syntax, you might need to add "" to indicate the beginning and the end of the string.

key: "This is a String"

List

key:
  - "value"
  - "also part of the value"

Map

key:
  value_key: "Value String"
  another_value_key: 5.678

Attribute data

Firework effects

UUID

key: "c3fd48a2-c23c-4952-84e7-bf62a1408c99"

Base64

https://www.base64encode.org can be used to encode Base64 strings. A common Minecraft related use case is the serialization of user profiles to make persistent texture values.

Many nice texture values meant to be used with heads can be found here.

key: "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZjM0ODdkNDU3ZjkwNjJkNzg3YTNlNmNlMWM0NjY0YmY3NDAyZWM2N2RkMTExMjU2ZjE5YjM4Y2U0ZjY3MCJ9fX0="