Types

Name	Description	Example
Integer	Number without decimal point	`42`
Float	Number with optional decimal point	`1.5`
String	Text surrounded by double quotes	`"Hello"`
Hex string	Hexadecimal number with hashtag in front of it	`"#0ABCDE"`

Attribute modifier

An attribute modifier may be an object or a list of objects.

Each object has the following fields:

If operation is "+", amount will be added to the attribute.

If operation is "*", attribute's value will be multiplied by amount + 1. This means it will show up as e.g. +50%.

{
  "attribute": "generic_attack_damage",
  "name": "myAttackDamageModifier",
  "amount": 0.5,
  "operation": "*"
}

An attribute is one of the following strings representing an attribute of an entity:

String	Description
`generic_armor`	Armor
`generic_armor_toughness`	Armor durability
`generic_attack_damage`	Attack damage
`generic_attack_knockback`	Attack knock-back
`generic_attack_speed`	Attack speed
`generic_flying_speed`	Flying speed
`generic_follow_range`	Range at which an entity will follow others
`generic_knockback_resistance`	Resistance to knock-back
`generic_luck`	Luck bonus
`generic_max_health`	Maximum health
`generic_movement_speed`	Movement speed
`horse_jump_strength`	Horse's jumping strength
`zombie_spawn_reinforcements`	Chance of a zombie spawning reinforcements

Slots represent an equipment slot of a player like his hand. They may be one of the following values represented as a string:

String	Description
`head`	The player's head slot used for helmets
`chest`	The player's chest slot used for chest-plates
`legs`	The player's legs slot used for leggings
`feet`	The player's feet slot used for boots
`hand`	The player's main hand
`off_hand`	The player's offhand