diff --git a/package-lock.json b/package-lock.json
index 91864063..f3a6a5e7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,7 +25,7 @@
         "@mcschema/java-1.20.5": "^0.0.42",
         "@mcschema/java-1.21": "^0.0.27",
         "@mcschema/java-1.21.2": "^0.0.16",
-        "@mcschema/java-1.21.4": "^0.0.3",
+        "@mcschema/java-1.21.4": "^0.0.13",
         "@mcschema/locales": "^0.1.104",
         "@zip.js/zip.js": "^2.4.5",
         "brace": "^0.11.1",
@@ -748,9 +748,9 @@
       }
     },
     "node_modules/@mcschema/java-1.21.4": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/@mcschema/java-1.21.4/-/java-1.21.4-0.0.3.tgz",
-      "integrity": "sha512-1KPHjCDkyMk0DtyrpFiTmpXMG/9XCBHCjMkE1ZvdBMYDLqbHFNPJwGnwDljpNgNJCOfKkfeVpmTBZv0ur9jpIg==",
+      "version": "0.0.13",
+      "resolved": "https://registry.npmjs.org/@mcschema/java-1.21.4/-/java-1.21.4-0.0.13.tgz",
+      "integrity": "sha512-0jQLqDLS4On5np2LGih3nqFB4+BjIu5omhKzpx+9FdKf3eOZkYPaU9uZbwYeK4MvZD5CVE/nXs0P2jCRLGowJw==",
       "dependencies": {
         "@mcschema/core": "^0.13.0"
       }
@@ -4902,9 +4902,9 @@
       }
     },
     "@mcschema/java-1.21.4": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/@mcschema/java-1.21.4/-/java-1.21.4-0.0.3.tgz",
-      "integrity": "sha512-1KPHjCDkyMk0DtyrpFiTmpXMG/9XCBHCjMkE1ZvdBMYDLqbHFNPJwGnwDljpNgNJCOfKkfeVpmTBZv0ur9jpIg==",
+      "version": "0.0.13",
+      "resolved": "https://registry.npmjs.org/@mcschema/java-1.21.4/-/java-1.21.4-0.0.13.tgz",
+      "integrity": "sha512-0jQLqDLS4On5np2LGih3nqFB4+BjIu5omhKzpx+9FdKf3eOZkYPaU9uZbwYeK4MvZD5CVE/nXs0P2jCRLGowJw==",
       "requires": {
         "@mcschema/core": "^0.13.0"
       }
diff --git a/package.json b/package.json
index e62549f0..531a9ecf 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "@mcschema/java-1.20.5": "^0.0.42",
     "@mcschema/java-1.21": "^0.0.27",
     "@mcschema/java-1.21.2": "^0.0.16",
-    "@mcschema/java-1.21.4": "^0.0.3",
+    "@mcschema/java-1.21.4": "^0.0.13",
     "@mcschema/locales": "^0.1.104",
     "@zip.js/zip.js": "^2.4.5",
     "brace": "^0.11.1",
diff --git a/src/app/schema/renderHtml.tsx b/src/app/schema/renderHtml.tsx
index 67b068c1..031c37e8 100644
--- a/src/app/schema/renderHtml.tsx
+++ b/src/app/schema/renderHtml.tsx
@@ -15,13 +15,13 @@ import { CachedDecorator, CachedFeature, checkVersion } from '../services/index.
 import { deepClone, deepEqual, generateColor, generateUUID, hexId, hexToRgb, isObject, newSeed, rgbToHex, stringToColor } from '../Utils.js'
 import { ModelWrapper } from './ModelWrapper.js'
 
-const selectRegistries = ['loot_table.type', 'loot_entry.type', 'function.function', 'condition.condition', 'criterion.trigger', 'recipe.type', 'dimension.generator.type', 'dimension.generator.biome_source.type', 'dimension.generator.biome_source.preset', 'carver.type', 'feature.type', 'decorator.type', 'feature.tree.minimum_size.type', 'block_state_provider.type', 'trunk_placer.type', 'foliage_placer.type', 'tree_decorator.type', 'int_provider.type', 'float_provider.type', 'height_provider.type', 'structure_feature.type', 'surface_builder.type', 'processor.processor_type', 'rule_test.predicate_type', 'pos_rule_test.predicate_type', 'template_element.element_type', 'block_placer.type', 'block_predicate.type', 'material_rule.type', 'material_condition.type', 'structure_placement.type', 'density_function.type', 'root_placer.type', 'entity.type_specific.cat.variant', 'entity.type_specific.frog.variant', 'rule_block_entity_modifier.type', 'pool_alias_binding.type', 'lithostitched.worldgen_modifier.type', 'lithostitched.modifier_predicate.type', 'ohthetreesyoullgrow.configured_feature.type', 'enchantment_provider.type', 'enchantment_value_effect.type', 'level_based_value.type', 'neoforge.biome_modifier.type', 'neoforge.structure_modifier.type']
+const selectRegistries = ['loot_table.type', 'loot_entry.type', 'function.function', 'condition.condition', 'criterion.trigger', 'recipe.type', 'dimension.generator.type', 'dimension.generator.biome_source.type', 'dimension.generator.biome_source.preset', 'carver.type', 'feature.type', 'decorator.type', 'feature.tree.minimum_size.type', 'block_state_provider.type', 'trunk_placer.type', 'foliage_placer.type', 'tree_decorator.type', 'int_provider.type', 'float_provider.type', 'height_provider.type', 'structure_feature.type', 'surface_builder.type', 'processor.processor_type', 'rule_test.predicate_type', 'pos_rule_test.predicate_type', 'template_element.element_type', 'block_placer.type', 'block_predicate.type', 'material_rule.type', 'material_condition.type', 'structure_placement.type', 'density_function.type', 'root_placer.type', 'entity.type_specific.cat.variant', 'entity.type_specific.frog.variant', 'rule_block_entity_modifier.type', 'pool_alias_binding.type', 'lithostitched.worldgen_modifier.type', 'lithostitched.modifier_predicate.type', 'ohthetreesyoullgrow.configured_feature.type', 'enchantment_provider.type', 'enchantment_value_effect.type', 'level_based_value.type', 'neoforge.biome_modifier.type', 'neoforge.structure_modifier.type', 'tint_source.type', 'item_model.condition.property', 'item_model.select.property', 'item_model.range_dispatch.property', 'special_item_model.type']
 const datalistEnums = ['item_stack.components', 'function.set_components.components']
 const hiddenFields = ['number_provider.type', 'score_provider.type', 'nbt_provider.type', 'int_provider.type', 'float_provider.type', 'height_provider.type', 'level_based_value.type']
 const flattenedFields = ['feature.config', 'decorator.config', 'int_provider.value', 'float_provider.value', 'block_state_provider.simple_state_provider.state', 'block_state_provider.rotated_block_provider.state', 'block_state_provider.weighted_state_provider.entries.entry.data', 'rule_test.block_state', 'structure_feature.config', 'surface_builder.config', 'template_pool.elements.entry.element', 'decorator.block_survives_filter.state', 'material_rule.block.result_state', 'enchantment.effects.entry.effect']
-const inlineFields = ['loot_entry.type', 'function.function', 'condition.condition', 'criterion.trigger', 'dimension.generator.type', 'dimension.generator.biome_source.type', 'feature.type', 'decorator.type', 'block_state_provider.type', 'feature.tree.minimum_size.type', 'trunk_placer.type', 'foliage_placer.type', 'tree_decorator.type', 'block_placer.type', 'rule_test.predicate_type', 'processor.processor_type', 'template_element.element_type', 'nbt_operation.op', 'number_provider.value', 'score_provider.name', 'score_provider.target', 'nbt_provider.source', 'nbt_provider.target', 'generator_biome.biome', 'block_predicate.type', 'material_rule.type', 'material_condition.type', 'density_function.type', 'root_placer.type', 'entity.type_specific.type', 'glyph_provider.type', 'sprite_source.type', 'rule_block_entity_modifier.type', 'immersive_weathering.area_condition.type', 'immersive_weathering.block_growth.growth_for_face.entry.direction', 'immersive_weathering.position_test.predicate_type', 'pool_alias_binding.type', 'item_stack.id', 'data_component.container.entry.slot', 'map_decoration.type', 'suspicious_stew_effect_instance.id', 'enchantment_value_effect.type', 'enchantment_effect.type', 'particle.type']
+const inlineFields = ['loot_entry.type', 'function.function', 'condition.condition', 'criterion.trigger', 'dimension.generator.type', 'dimension.generator.biome_source.type', 'feature.type', 'decorator.type', 'block_state_provider.type', 'feature.tree.minimum_size.type', 'trunk_placer.type', 'foliage_placer.type', 'tree_decorator.type', 'block_placer.type', 'rule_test.predicate_type', 'processor.processor_type', 'template_element.element_type', 'nbt_operation.op', 'number_provider.value', 'score_provider.name', 'score_provider.target', 'nbt_provider.source', 'nbt_provider.target', 'generator_biome.biome', 'block_predicate.type', 'material_rule.type', 'material_condition.type', 'density_function.type', 'root_placer.type', 'entity.type_specific.type', 'glyph_provider.type', 'sprite_source.type', 'rule_block_entity_modifier.type', 'immersive_weathering.area_condition.type', 'immersive_weathering.block_growth.growth_for_face.entry.direction', 'immersive_weathering.position_test.predicate_type', 'pool_alias_binding.type', 'item_stack.id', 'data_component.container.entry.slot', 'map_decoration.type', 'suspicious_stew_effect_instance.id', 'enchantment_value_effect.type', 'enchantment_effect.type', 'particle.type', 'item_model.type', 'special_item_model.type', 'tint_source.type']
 const nbtFields = ['function.set_nbt.tag', 'advancement.display.icon.nbt', 'text_component_object.nbt', 'entity.nbt', 'block.nbt', 'item.nbt']
-const fixedLists = ['generator_biome.parameters.temperature', 'generator_biome.parameters.humidity', 'generator_biome.parameters.continentalness', 'generator_biome.parameters.erosion', 'generator_biome.parameters.depth', 'generator_biome.parameters.weirdness', 'feature.end_spike.crystal_beam_target', 'feature.end_gateway.exit', 'decorator.block_filter.offset', 'block_predicate.has_sturdy_face.offset', 'block_predicate.inside_world_bounds.offset', 'block_predicate.matching_block_tag.offset', 'block_predicate.matching_blocks.offset', 'block_predicate.matching_fluids.offset', 'block_predicate.would_survive.offset', 'model_element.from', 'model_element.to', 'model_element.rotation.origin', 'model_element.faces.uv', 'item_transform.rotation', 'item_transform.translation', 'item_transform.scale', 'generator_structure.random_spread.locate_offset', 'pack_overlay.formats', 'data_component.profile.id', 'data_component.lodestone_tracker.tracker.pos', 'attribute_modifier.uuid']
+const fixedLists = ['generator_biome.parameters.temperature', 'generator_biome.parameters.humidity', 'generator_biome.parameters.continentalness', 'generator_biome.parameters.erosion', 'generator_biome.parameters.depth', 'generator_biome.parameters.weirdness', 'feature.end_spike.crystal_beam_target', 'feature.end_gateway.exit', 'decorator.block_filter.offset', 'block_predicate.has_sturdy_face.offset', 'block_predicate.inside_world_bounds.offset', 'block_predicate.matching_block_tag.offset', 'block_predicate.matching_blocks.offset', 'block_predicate.matching_fluids.offset', 'block_predicate.would_survive.offset', 'model_element.from', 'model_element.to', 'model_element.rotation.origin', 'model_element.faces.uv', 'item_transform.rotation', 'item_transform.translation', 'item_transform.scale', 'generator_structure.random_spread.locate_offset', 'pack_overlay.formats', 'data_component.profile.id', 'data_component.lodestone_tracker.tracker.pos', 'attribute_modifier.uuid', 'tint_source.constant.value', 'tint_source.dye.default', 'tint_source.firework.default', 'tint_source.potion.default', 'tint_source.map_color.default']
 const collapsedFields = ['noise_settings.surface_rule', 'noise_settings.noise.terrain_shaper']
 const collapsableFields = ['density_function.argument', 'density_function.argument1', 'density_function.argument2', 'density_function.input', 'density_function.when_in_range', 'density_function.when_out_of_range']
 const itemPreviewFields = ['loot_pool.entries.entry', 'loot_entry.alternatives.children.entry', 'loot_entry.group.children.entry', 'loot_entry.sequence.children.entry', 'function.set_contents.entries.entry']
diff --git a/src/app/services/DataFetcher.ts b/src/app/services/DataFetcher.ts
index 830c811e..dcd964d8 100644
--- a/src/app/services/DataFetcher.ts
+++ b/src/app/services/DataFetcher.ts
@@ -157,7 +157,7 @@ export async function fetchPreset(versionId: VersionId, registry: string, id: st
 		if (id.startsWith('immersive_weathering:')) {
 			url = `https://raw.githubusercontent.com/AstralOrdana/Immersive-Weathering/main/src/main/resources/data/immersive_weathering/block_growths/${id.slice(21)}.json`
 		} else {
-			const type = ['atlases', 'blockstates', 'models', 'font'].includes(registry) ? 'assets' : 'data'
+			const type = ['atlases', 'blockstates', 'items', 'models', 'font'].includes(registry) ? 'assets' : 'data'
 			url = `${mcmeta(version, type)}/${type}/minecraft/${registry}/${id}.json`
 		}
 		const res = await fetch(url)
@@ -172,7 +172,7 @@ export async function fetchAllPresets(versionId: VersionId, registry: string) {
 	const version = config.versions.find(v => v.id === versionId)!
 	await validateCache(version)
 	try {
-		const type = ['atlas', 'block_definition', 'model', 'font'].includes(registry) ? 'assets' : 'data'
+		const type = ['atlas', 'block_definition', 'item_definition', 'model', 'font'].includes(registry) ? 'assets' : 'data'
 		return new Map<string, unknown>(Object.entries(await cachedFetch(`${mcmeta(version, 'summary')}/${type}/${registry}/data.min.json`)))
 	} catch (e) {
 		throw new Error(`Error occurred while fetching all ${registry} presets: ${message(e)}`)
diff --git a/src/config.json b/src/config.json
index cfa8fe5b..6faf7887 100644
--- a/src/config.json
+++ b/src/config.json
@@ -609,6 +609,14 @@
       "schema": "block_definition",
       "wiki": "https://minecraft.wiki/w/Tutorials/Models#Block_states"
     },
+    {
+      "id": "item_definition",
+      "url": "assets/item",
+      "path": "items",
+      "tags": ["assets"],
+      "schema": "item_definition",
+      "minVersion": "1.21.4"
+    },
     {
       "id": "model",
       "url": "assets/model",
diff --git a/src/locales/en.json b/src/locales/en.json
index 54c70095..f6089e96 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -69,6 +69,7 @@
   "generator.font": "Font",
   "generator.immersive_weathering.block_growth": "Block Growth",
   "generator.instrument": "Instrument",
+  "generator.item_definition": "Item",
   "generator.item_modifier": "Item Modifier",
   "generator.jukebox_song": "Jukebox Song",
   "generator.lithostitched.worldgen_modifier": "Worldgen Modifier",