Built-In Data Maps
NeoForge provides various built-in data maps for common use cases, replacing hardcoded vanilla fields. Vanilla values are shipped by data map files in NeoForge, so there is no functional difference to the player.
neoforge:compostables
Allows configuring composter values, as a replacement for ComposterBlock.COMPOSTABLES (which is now ignored). This data map is located at neoforge/data_maps/item/compostables.json and its objects have the following structure:
{
// A 0 to 1 (inclusive) float representing the chance that the item will update the level of the composter
"chance": 1,
// Optional, defaults to false - whether farmer villagers can compost this item
"can_villager_compost": false
}
Example:
{
"values": {
// Give acacia logs a 50% chance that they will fill a composter
"minecraft:acacia_log": {
"chance": 0.5
}
}
}
neoforge:furnace_fuels
Allows configuring item burn times. This data map is located at neoforge/data_maps/item/furnace_fuels.json and its objects have the following structure:
{
// A positive integer representing the item's burn time in ticks
"burn_time": 1000
}
Example:
{
"values": {
// Give anvils a 2 seconds burn time
"minecraft:anvil": {
"burn_time": 40
}
}
}
NeoForge additionally adds the IItemExtension#getBurnTime method to be overridden in custom items, overruling this data map. #getBurnTime should only be used in scenarios where the datamap does not suffice, for example data component-dependent burn times.
Vanilla adds an implicit burn time of 300 ticks (15 seconds) for #minecraft:logs and #minecraft:planks, and then hardcodes the removal of crimson and warped items from that. This means that if you add another non-flammable wood, you should add a removal for that wood type's items from this map, like so:
{
"replace": false,
"values": [
// values here
],
"remove": [
"examplemod:example_nether_wood_planks",
"#examplemod:example_nether_wood_stems",
"examplemod:example_nether_wood_door",
// etc.
// other removals here
]
}
neoforge:monster_room_mobs
Allows configuring the mobs that may appear in the mob spawner in a monster room, as a replacement for MonsterRoomFeature#MOBS (which is now ignored). This data map is located at neoforge/data_maps/entity_type/monster_room_mobs.json and its objects have the following structure:
{
// The weight of this mob, relative to other mobs in the datamap
"weight": 100
}
Example:
{
"values": {
// Make squids appear in monster room spawners with a weight of 100
"minecraft:squid": {
"weight": 100
}
}
}
neoforge:oxidizables
Allows configuring oxidation stages, as a replacement for WeatheringCopper#NEXT_BY_BLOCK (which will be ignored in 1.21.2). This data map is also used to build a reverse deoxidation map (for scraping with an axe). It is located at neoforge/data_maps/block/oxidizables.json and its objects have the following structure:
{
// The block this block will turn into once oxidized
"next_oxidized_stage": "examplemod:oxidized_block"
}
Custom blocks must implement WeatheringCopperFullBlock or WeatheringCopper and call changeOverTime in randomTick to oxidize naturally.
Example:
{
"values": {
"mymod:custom_copper": {
// Make a custom copper block oxidize into custom oxidized copper
"next_oxidized_stage": "mymod:custom_oxidized_copper"
}
}
}
neoforge:parrot_imitations
Allows configuring the sounds produced by parrots when they want to imitate a mob, as a replacement for Parrot#MOB_SOUND_MAP (which is now ignored). This data map is located at neoforge/data_maps/entity_type/parrot_imitations.json and its objects have the following structure:
{
// The ID of the sound that parrots will produce when imitating the mob
"sound": "minecraft:entity.parrot.imitate.creeper"
}
Example:
{
"values": {
// Make parrots produce the ambient cave sound when imitating allays
"minecraft:allay": {
"sound": "minecraft:ambient.cave"
}
}
}
neoforge:raid_hero_gifts
Allows configuring the gift that a villager with a certain VillagerProfession may gift you if you stop the raid, as a replacement for GiveGiftToHero#GIFTS (which is now ignored). This data map is located at neoforge/data_maps/villager_profession/raid_hero_gifts.json and its objects have the following structure:
{
// The ID of the loot table that a villager profession will hand out after a raid
"loot_table": "minecraft:gameplay/hero_of_the_village/armorer_gift"
}
Example:
{
"values": {
"minecraft:armorer": {
// Make armorers give the raid hero the armorer gift loot table
"loot_table": "minecraft:gameplay/hero_of_the_village/armorer_gift"
}
}
}
neoforge:vibration_frequencies
Allows configuring the sculk vibration frequencies emitted by game events, as a replacement for VibrationSystem#VIBRATION_FREQUENCY_FOR_EVENT (which is now ignored). This data map is located at neoforge/data_maps/game_event/vibration_frequencies.json and its objects have the following structure:
{
// An integer between 1 and 15 (inclusive) that indicates the vibration frequency of the event
"frequency": 2
}
Example:
{
"values": {
// Make the splash in water game event vibrate on the second frequency
"minecraft:splash": {
"frequency": 2
}
}
}
neoforge:waxables
Allows configuring the block a block will turn into when waxed (right clicked with a honeycomb), as a replacement for HoneycombItem#WAXABLES (which will be ignored in 1.21.2). This data map is also used to build a reverse dewaxing map (for scraping with an axe). It is located at neoforge/data_maps/block/waxables.json and its objects have the following structure:
{
// The waxed variant of this block
"waxed": "minecraft:iron_block"
}
Example:
{
"values": {
// Make gold blocks turn into iron blocks once waxed
"minecraft:gold_block": {
"waxed": "minecraft:iron_block"
}
}
}