Datapacks

Slime types are data, not code. Every type you see in game, including its food, product, pen time and breeding recipe, is a JSON file that a datapack can change, remove or add to.

What you can change

• Add a new slime type, for example a Copper Ore slime for a modpack.
• Change an existing type: its food, what it squeezes into, its pen time or its color.
• Change breeding: different parents, a different catalyst block, or a catalyst that gets used up.
• Control wild spawns: any type with natural_spawn set can appear in the Slimy Land.

Slime types are a registry, loaded when a world is created or opened. Unlike recipes, /reload does not apply changes: restart the world after editing a datapack.

Where files go

my_datapack/
  pack.mcmeta
  data/<namespace>/productiveslimes/slime_type/<name>.json

The file's location is the type's id. data/mypack/productiveslimes/slime_type/copper_ore.json creates mypack:copper_ore. To change a built-in type, use the same path as the mod: data/productiveslimes/productiveslimes/slime_type/iron.json.

The format is on the Slime type files page.

Names

A type's display name comes from the translation key slime_type.<namespace>.<name>. Add it to a resource pack's lang file:

{
  "slime_type.mypack.copper_ore": "Copper Ore"
}

Items then read "Copper Ore Slimeball", "Jar of Copper Ore Slime" and so on.