This version has a big change for 1.21.3 by renaming the root fields for items. It also moves crafting remainders to recipes and adds brewing recipes.

For a few more details regarding the split and future you can look at the roadmap to 1.21!

Changes

• Removed armour materials entirely.
  • Its values are now inlined in the minecraft:armor item behaviour component instead.

Assets

• Added four textures for the Brewing Stand recipe book filter button.
• Added four textures for the Brewing Stand recipe book alternatives overlay.

Items

• Renamed the base field to display.
  • It only contains data related to the item's display.
• Renamed the components field to behavior.
  • It only contains (or should only contain) item behaviour. Everything else must be moved elsewhere.

These two changes have been made due to a new required field in the item display, which already breaks all existing item definitions.

• Added the optional attribute_modifiers field to the item.
  • Its value is the same as the list form of the minecraft:attribute_modifiers data component.
• Added the model field to the item display.
  • Its value is an id referencing an item model in a resource pack.
  • This value can be changed for individual item stacks in the minecraft:item_model data component.

So if you had this:

{
  "base": {
    "translation_key": "item.minecraft.stick"
  },
  "components": {
    "minecraft:fuel": {
      "ticks": 100
    },
    "minecraft:stackable": 64
  }
}

You now have to use this instead:

{
  "display": {
    "translation_key": "item.minecraft.stick",
    "model": "minecraft:stick"
  },
  "behavior": {
    "minecraft:fuel": {
      "ticks": 100
    },
    "minecraft:stackable": 64
  }
}

• Added the optional tooltip_style field to the item display.
  • Its value is an id referencing a texture in a resource pack.
  • This value can be changed for individual item stacks in the minecraft:tooltip_style data component.
• Added the minecraft:before_death_holder item event.
• Added new item tags:
  • #minecraft:brewing_inputs, which is used for the accepted items for the Brewing Stand input slots.
  • #minecraft:mundane_potion_reagents, which is used to convert Water Bottles to Mundane Potions in a brewing recipe.

Item Behaviour Components

• Added the following item behaviour components:
  • minecraft:glider
• Removed the following item behaviour components:
  • minecraft:attribute_modifiers
    • This has been replaced with the attribute_modifiers field on the item and entries should be moved there.

So if you had this:

{
  "behavior": {
    "minecraft:attribute_modifiers": [
      {
        "id": "example:tool.heavy",
        "type": "minecraft:gravity",
        "amount": 0.01,
        "operation": "add_value",
        "slot": "hand"
      }
    ]
  }
}

You now have to use this instead:

{
  "attribute_modifiers": [
    {
      "id": "example:tool.heavy",
      "type": "minecraft:gravity",
      "amount": 0.01,
      "operation": "add_value",
      "slot": "hand"
    }
  ]
}

• minecraft:armor
  • This has been replaced with the attribute_modifiers field on the item and entries should be moved there.

So if you had this:

{
  "behavior": {
    "minecraft:armor": {
      "attribute_id": "minecraft:armor.chestplate",
      "defense": 8,
      "knockback_resistance": 0.0,
      "toughness": 2.0
    }
  }
}

You now have to use this instead:

{
  "attribute_modifiers": [
    {
      "id": "minecraft:armor.chestplate",
      "type": "minecraft:armor",
      "amount": 8.0,
      "operation": "add_value",
      "slot": "chest"
    },
    {
      "id": "minecraft:armor.chestplate",
      "type": "minecraft:armor_toughness",
      "amount": 2.0,
      "operation": "add_value",
      "slot": "chest"
    }
  ]
}

• minecraft:life_saving
  • This has been replaced with the new minecraft:before_death_holder item event.
  • To replicate the previous behaviour, the minecraft:clear_status_effects and minecraft:add_status_effects actions can be used.
  • Note that this means that the minecraft:death_protection data component is unused as a result.
  • The reason this was moved to an item event is to support the newly added 'consume effects' from the minecraft:death_protection data component from vanilla in 1.21.3, which the action system accommodates for with even more possibilities.
• minecraft:recipe_remainder
  • This has been replaced by remainders in recipe ingredients directly and the new remainder field in the minecraft:fuel item behaviour component.
• minecraft:useable_on_fluid
  • This has been replaced in favour of passes in their respective behaviour components.

minecraft:consumable

• Moved the result_item field to remainder in minecraft:useable.

minecraft:cooldown

• Added an optional group field, which is the id to use as the cooldown group. If not specified, it will use the item id

minecraft:entity

• Added an optional passes field, which is a list of strings that allows its user to place an entity given a certain context.
  • block: Allows the user to place the entity on a block.
  • fluid: Allows the user to place the entity on a fluid.
• Its default value is ["block"].

Example:

{
  "allow_item_data": true,
  "entity": {
    "type": "minecraft:pig"
  },
  "passes": [
    "block",
    "fluid"
  ]
}

minecraft:equipment

• Updated to match the minecraft:equippable data component.
• Note that the dispensable field is unused as it has been replaced by the minecraft:dispensable item behaviour.

minecraft:food

• Removed the effects field.
• This should now be applied with the minecraft:consume_item or minecraft:eat_item item event combined with predicates and the new minecraft:add_status_effects action.

So if you had this:

{
  "components": {
    "minecraft:food": {
      "effects": [
        {
          "effect": {
            "id": "minecraft:hunger",
            "duration": 600,
            "show_icon": true
          },
          "probability": 0.8
        }
      ],
      "nutrition": 4,
      "saturation": 0.8
    }
  }
}

You now have to use this instead:

{
  "components": {
    "minecraft:food": {
      "nutrition": 4,
      "saturation": 0.8
    }
  },
  "events": {
    "minecraft:consume_item": {
      "action": {
        "type": "minecraft:add_status_effects",
        "effects": [
          {
            "id": "minecraft:hunger",
            "duration": 600,
            "show_icon": true
          }
        ],
        "entity": "this"
      },
      "requirements": {
        "conditions": {
          "chance": 0.8,
          "condition": "minecraft:random_chance"
        },
        "context": {
          "entity": "this",
          "position": "this"
        }
      }
    }
  }
}

minecraft:fuel

• Added an optional remainder field, which is the item stack to leave when used as a fuel.
• This replaces the minecraft:recipe_remainder item behaviour that was used previously for this.

Example:

{
  "remainder": {
    "id": "minecraft:bucket",
    "count": 1
  },
  "ticks": 20000
}

minecraft:glider

• Allows its user to glide in the air and use Firework Rockets to boost themselves forwards.
• Fields:
  • useable_if: An optional item predicate. Checks whether its user can use the glider. If not specified, the user can always use the glider.

minecraft:useable

• Added an optional remainder field, which is the item stack to leave when finished using, whether instantaneous or over a specified duration.

Example:

{
  "animation": "eat",
  "remainder": {
    "id": "minecraft:bowl",
    "count": 1
  },
  "ticks": {
    "type": "minecraft:constant",
    "amount": 32
  }
}

• Changed the way the use duration in the ticks field works:
• If not specified, the item will be used instantly instead of being used indefinitely.
• To reproduce the previous behaviour, use the new minecraft:indefinite use duration provider.
• This makes the field in the behaviour component the same as the data component in all cases.
• A positive integer can still be used as a direct usage of minecraft:constant.

So if you had this:

{
  "minecraft:useable": {
    "animation": "block"
  }
}

You now have to use this instead:

{
  "minecraft:useable": {
    "animation": "block",
    "ticks": {
      "type": "minecraft:indefinite"
    }
  }
}

Data Components

• Removed the following data components:
  • minecraft:immune_to_damage
    • This has been replaced by minecraft:damage_resistant from vanilla.
    • Entries are datafixed properly.
• Made the following data components unused:
  • minecraft:death_protection
    • This has been replaced by the minecraft:before_death_holder item event to accommodate more actions.
    • The reason the data component itself still exists is to not break existing worlds.

minecraft:equippable

• No longer uses the dispensable field as it has been replaced by the minecraft:dispensable item behaviour.

minecraft:glider

• Now has an optional useable_if field, which is an item predicate to check whether its user can use the glider.
• If not specified, the user can always use the glider.

minecraft:use_duration

• You now no longer specify a ticks field, making it consistent with the way it is used in the minecraft:useable behaviour.

So if you had this:

{
  "ticks": {
    "type": "minecraft:constant",
    "amount": 32
  }
}

You now have to use this instead:

{
  "type": "minecraft:constant",
  "amount": 32
}

• You can no longer specify an empty map to specify an indefinite use duration and you must use the minecraft:indefinite use duration provider instead.

So if you had this:

{}

You must now use this:

{
  "type": "minecraft:indefinite"
}

• A positive integer can still be used as a direct usage of the minecraft:constant use duration provider.

minecraft:weapon_attack_damage

• When determining whether to add the base minecraft:attack_damage attribute or not, it now defaults to true instead of false and must be explicitly set by rules accordingly.

Use Durations

• Added the following use durations:
  • minecraft:indefinite

minecraft:indefinite

• Always uses the item indefinitely.
• Has no additional fields.

Actions

• Added the following actions:
  • minecraft:add_status_effects

minecraft:add_status_effects

• Adds status effects to an entity.
• The action is unsuccessful if the entity does not exist, is not a living entity or if no effect is added.
• Fields:
  • effects: A list of status effects. The effects to apply to the entity.
  • entity: An action context parameter. The entity to target.

Example:

{
  "type": "minecraft:add_status_effects",
  "effects": [
    {
      "id": "minecraft:regeneration",
      "amplifier": 1,
      "duration": 100,
      "show_icon": true
    },
    {
      "id": "minecraft:absorption",
      "duration": 2400,
      "show_icon": true
    }
  ],
  "entity": "this"
}

Entity Initialisers

• Removed the variant field from minecraft:boat as its variant has been split up into separate entity types.

So if you had this:

{
  "type": "minecraft:boat",
  "variant": "minecraft:oak"
}

You must now use this instead:

{
  "type": "minecraft:oak_boat"
}

• Removed the prevent_spawn_from_riptide field from minecraft:trident.

Recipes

• Added the following recipe types:
  • minecraft:brewing_amplify
  • minecraft:brewing_modify
• Removed the following recipe types:
• minecraft:item_coloring
  • This has been replaced by minecraft:crafting_transmute from vanilla.
• Added remainders to ingredients.
  • Replaces the minecraft:recipe_remainder item behaviour component.
  • The existing format still works.
  • Currently only in use for shaped and shapeless recipes.
  • Fields:
    • items: An item, list of items or hash-prefixed item tag. The items to allow for this ingredient.
    • remainder: An optional item stack. The item stack to leave when the ingredient is consumed.

Example:

{
  "items": "minecraft:milk_bucket",
  "remainder": {
    "id": "minecraft:bucket",
    "count": 1
  }
}

minecraft:brewing_amplify

• Transforms the item into another one after brewing.
• Format:
  • group: An optional string. Used to group recipes together.
  • base: An item. The item to transform.
  • reagent: An ingredient. The items to accept to modify the item.
  • result: An item. The item to transform into.
  • brewing_time: An optional positive integer. The number of ticks the recipe takes to complete.
    • Its default value is 400.
• A remainder may be specified for the reagent that is left in the slot or dropped in the world after brewing.

Example:

{
  "type": "minecraft:brewing_amplify",
  "reagent": {
    "items": "minecraft:dragon_breath",
    "remainder": {
      "id": "minecraft:glass_bottle",
      "count": 1
    }
  },
  "base": "minecraft:splash_potion",
  "result": "minecraft:lingering_potion"
}

minecraft:brewing_modify

• Changes the potion present on the item into another one after brewing.
• Format:
  • group: An optional string. Used to group recipes together.
  • base: A potion. The potion to modify.
  • reagent: An ingredient. The items to accept to modify the potion.
  • result: A potion. The potion to leave.
• A remainder may be specified for the reagent that is left in the slot or dropped in the world after brewing.

Example:

{
  "type": "minecraft:brewing_modify",
  "reagent": "minecraft:sugar",
  "base": "minecraft:awkward",
  "result": "minecraft:swiftness"
}

Colour Providers

• Added the following colour provider types:
  • minecraft:first_to_pass_condition

minecraft:first_to_pass_condition

• Uses the first colour provider whose condition passes or uses the fallback otherwise.
• Fields:
  • entries: A non-empty list of colour providers. The colours to pick from depending on their conditions.
  • fallback: The fallback colour provider to use when all entries fail.
• Entry fields:
  • color: A colour provider.
  • condition: An entry condition. The condition that needs to pass in order to use this colour provider.
• Entry condition fields:
  • progress: A number range that checks for the progress.

Example:

{
  "type": "minecraft:first_to_pass_condition",
  "entries": [
    {
      "color": {
        "type": "minecraft:constant",
        "color": -43948
      },
      "condition": {
        "progress": 1.0
      }
    }
  ],
  "fallback": {
    "type": "minecraft:constant",
    "color": -9402369
  }
}

This version moves crafting remainders to recipes and adds brewing recipes.

For a few more details regarding the split and future you can look at the roadmap to 1.21!

Changes

Assets

• Added four textures for the Brewing Stand recipe book filter button.
• Added four textures for the Brewing Stand recipe book alternatives overlay.

Items

• Added the optional attribute_modifiers field to the item.
  • Its value is the same as the list form of the minecraft:attribute_modifiers data component.
• Added the minecraft:before_death_holder item event.
• Added new item tags:
  • #minecraft:brewing_inputs, which is used for the accepted items for the Brewing Stand input slots.
  • #minecraft:mundane_potion_reagents, which is used to convert Water Bottles to Mundane Potions in a brewing recipe.

Item Behaviour Components

• Removed the following item behaviour components:
  • minecraft:attribute_modifiers
    • This has been replaced with the attribute_modifiers field on the item and entries should be moved there.

So if you had this:

{
  "behavior": {
    "minecraft:attribute_modifiers": [
      {
        "id": "example:tool.heavy",
        "type": "minecraft:gravity",
        "amount": 0.01,
        "operation": "add_value",
        "slot": "hand"
      }
    ]
  }
}

You now have to use this instead:

{
  "attribute_modifiers": [
    {
      "id": "example:tool.heavy",
      "type": "minecraft:gravity",
      "amount": 0.01,
      "operation": "add_value",
      "slot": "hand"
    }
  ]
}

• minecraft:life_saving
  • This has been replaced with the new minecraft:before_death_holder item event.
  • To replicate the previous behaviour, the minecraft:clear_status_effects and minecraft:add_status_effects actions can be used.
  • Note that this means that the minecraft:death_protection data component is unused as a result.
  • The reason this was moved to an item event is to support the newly added 'consume effects' from the minecraft:death_protection data component from vanilla in 1.21.3, which the action system accommodates for with even more possibilities.
• minecraft:recipe_remainder
  • This has been replaced by remainders in recipe ingredients directly and the new remainder field in the minecraft:fuel item behaviour component.
• minecraft:useable_on_fluid
  • This has been replaced in favour of passes in their respective behaviour components.

minecraft:consumable

• Moved the result_item field to remainder in minecraft:useable.

minecraft:entity

• Added an optional passes field, which is a list of strings that allows its user to place an entity given a certain context.
  • block: Allows the user to place the entity on a block.
  • fluid: Allows the user to place the entity on a fluid.
• Its default value is ["block"].

Example:

{
  "allow_item_data": true,
  "entity": {
    "type": "minecraft:pig"
  },
  "passes": [
    "block",
    "fluid"
  ]
}

minecraft:food

• Removed the effects field.
• This should now be applied with the minecraft:consume_item or minecraft:eat_item item event combined with predicates and the new minecraft:add_status_effects action.

So if you had this:

{
  "components": {
    "minecraft:food": {
      "effects": [
        {
          "effect": {
            "id": "minecraft:hunger",
            "duration": 600,
            "show_icon": true
          },
          "probability": 0.8
        }
      ],
      "nutrition": 4,
      "saturation": 0.8
    }
  }
}

You now have to use this instead:

{
  "components": {
    "minecraft:food": {
      "nutrition": 4,
      "saturation": 0.8
    }
  },
  "events": {
    "minecraft:consume_item": {
      "action": {
        "type": "minecraft:add_status_effects",
        "effects": [
          {
            "id": "minecraft:hunger",
            "duration": 600,
            "show_icon": true
          }
        ],
        "entity": "this"
      },
      "requirements": {
        "conditions": {
          "chance": 0.8,
          "condition": "minecraft:random_chance"
        },
        "context": {
          "entity": "this",
          "position": "this"
        }
      }
    }
  }
}

minecraft:fuel

• Added an optional remainder field, which is the item stack to leave when used as a fuel.
• This replaces the minecraft:recipe_remainder item behaviour that was used previously for this.

Example:

{
  "remainder": {
    "id": "minecraft:bucket",
    "count": 1
  },
  "ticks": 20000
}

minecraft:useable

• Added an optional remainder field, which is the item stack to leave when finished using, whether instantaneous or over a specified duration.

Example:

{
  "animation": "eat",
  "remainder": {
    "id": "minecraft:bowl",
    "count": 1
  },
  "ticks": {
    "type": "minecraft:constant",
    "amount": 32
  }
}

• Changed the way the use duration in the ticks field works:
• If not specified, the item will be used instantly instead of being used indefinitely.
• To reproduce the previous behaviour, use the new minecraft:indefinite use duration provider.
• This makes the field in the behaviour component the same as the data component in all cases.
• A positive integer can still be used as a direct usage of minecraft:constant.

So if you had this:

{
  "minecraft:useable": {
    "animation": "block"
  }
}

You now have to use this instead:

{
  "minecraft:useable": {
    "animation": "block",
    "ticks": {
      "type": "minecraft:indefinite"
    }
  }
}

Data Components

• Removed the following data components:
  • minecraft:immune_to_damage
    • This has been replaced by minecraft:damage_resistant from vanilla.
    • Entries are datafixed properly.

minecraft:use_duration

• You now no longer specify a ticks field, making it consistent with the way it is used in the minecraft:useable behaviour.

So if you had this:

{
  "ticks": {
    "type": "minecraft:constant",
    "amount": 32
  }
}

You now have to use this instead:

{
  "type": "minecraft:constant",
  "amount": 32
}

• You can no longer specify an empty map to specify an indefinite use duration and you must use the minecraft:indefinite use duration provider instead.

So if you had this:

{}

You must now use this:

{
  "type": "minecraft:indefinite"
}

• A positive integer can still be used as a direct usage of the minecraft:constant use duration provider.

minecraft:weapon_attack_damage

• When determining whether to add the base minecraft:attack_damage attribute or not, it now defaults to true instead of false and must be explicitly set by rules accordingly.

Use Durations

• Added the following use durations:
  • minecraft:indefinite

minecraft:indefinite

• Always uses the item indefinitely.
• Has no additional fields.

Actions

• Added the following actions:
  • minecraft:add_status_effects

minecraft:add_status_effects

• Adds status effects to an entity.
• The action is unsuccessful if the entity does not exist, is not a living entity or if no effect is added.
• Fields:
  • effects: A list of status effects. The effects to apply to the entity.
  • entity: An action context parameter. The entity to target.

Example:

{
  "type": "minecraft:add_status_effects",
  "effects": [
    {
      "id": "minecraft:regeneration",
      "amplifier": 1,
      "duration": 100,
      "show_icon": true
    },
    {
      "id": "minecraft:absorption",
      "duration": 2400,
      "show_icon": true
    }
  ],
  "entity": "this"
}

Recipes

• Added the following recipe types:
  • minecraft:brewing_amplify
  • minecraft:brewing_modify
• Added remainders to ingredients.
  • Replaces the minecraft:recipe_remainder item behaviour component.
  • The existing format still works.
  • Currently only in use for shaped and shapeless recipes.
  • Fields:
    • items: An ingredient entry or list of ingredient entries.
    • remainder: An optional item stack. The item stack to leave when the ingredient is consumed.

Example:

{
  "items": {
    "item": "minecraft:milk_bucket"
  },
  "remainder": {
    "id": "minecraft:bucket",
    "count": 1
  }
}

minecraft:brewing_amplify

• Transforms the item into another one after brewing.
• Format:
  • group: An optional string. Used to group recipes together.
  • base: An item. The item to transform.
  • reagent: An ingredient. The items to accept to modify the item.
  • result: An item. The item to transform into.
  • brewing_time: An optional positive integer. The number of ticks the recipe takes to complete.
    • Its default value is 400.
• A remainder may be specified for the reagent that is left in the slot or dropped in the world after brewing.

Example:

{
  "type": "minecraft:brewing_amplify",
  "reagent": {
    "items": {
      "item": "minecraft:dragon_breath"
    },
    "remainder": {
      "id": "minecraft:glass_bottle",
      "count": 1
    }
  },
  "base": "minecraft:splash_potion",
  "result": "minecraft:lingering_potion"
}

minecraft:brewing_modify

• Changes the potion present on the item into another one after brewing.
• Format:
  • group: An optional string. Used to group recipes together.
  • base: A potion. The potion to modify.
  • reagent: An ingredient. The items to accept to modify the potion.
  • result: A potion. The potion to leave.
• A remainder may be specified for the reagent that is left in the slot or dropped in the world after brewing.

Example:

{
  "type": "minecraft:brewing_modify",
  "reagent": {
    "item": "minecraft:sugar"
  },
  "base": "minecraft:awkward",
  "result": "minecraft:swiftness"
}

This preview version adds an optional duration field to brewing recipes and previews for recipe alternatives.

For a few more details regarding the split and future you can look at the roadmap to 1.21!

Changes

Assets

• Added four textures for the Brewing Stand recipe book alternatives overlay.

Items

• Renamed the #minecraft:mundane_potion_additions item tag to #minecraft:mundane_potion_reagents.

Recipes

• Renamed the addition field to reagent for brewing recipes.

So if you had this:

{
  "type": "minecraft:brewing_modify",
  "addition": "minecraft:sugar",
  "base": "minecraft:awkward",
  "result": "minecraft:swiftness"
}

You now have to use this instead:

{
  "type": "minecraft:brewing_modify",
  "base": "minecraft:awkward",
  "reagent": "minecraft:sugar",
  "result": "minecraft:swiftness"
}

• Added an optional brewing_duration field to brewing recipes, which is a positive integer representing the number of ticks the recipe takes to complete.
  • Its default value is 400.

Example:

{
  "type": "minecraft:brewing_modify",
  "base": "minecraft:awkward",
  "reagent": "minecraft:sugar",
  "result": "minecraft:swiftness",
  "brewing_time": 200
}

This preview version adds an optional duration field to brewing recipes and previews for recipe alternatives.

For a few more details regarding the split and future you can look at the roadmap to 1.21!

Changes

Assets

• Added four textures for the Brewing Stand recipe book alternatives overlay.

Items

• Renamed the #minecraft:mundane_potion_additions item tag to #minecraft:mundane_potion_reagents.

Recipes

• Renamed the addition field to reagent for brewing recipes.

So if you had this:

{
  "type": "minecraft:brewing_modify",
  "addition": "minecraft:sugar",
  "base": "minecraft:awkward",
  "result": "minecraft:swiftness"
}

You now have to use this instead:

{
  "type": "minecraft:brewing_modify",
  "base": "minecraft:awkward",
  "reagent": "minecraft:sugar",
  "result": "minecraft:swiftness"
}

• Added an optional brewing_duration field to brewing recipes, which is a positive integer representing the number of ticks the recipe takes to complete.
  • Its default value is 400.

Example:

{
  "type": "minecraft:brewing_modify",
  "base": "minecraft:awkward",
  "reagent": "minecraft:sugar",
  "result": "minecraft:swiftness",
  "brewing_time": 200
}

This preview version adds data-driven brewing recipes with a recipe book and moves attribute modifiers on items outside of the item behaviour.

For a few more details regarding the split and future you can look at the roadmap to 1.21!

Changes

Assets

• Added four textures for the Brewing Stand recipe book filter button.

Items

• Added new item tags:
  • #minecraft:brewing_inputs, which is used for the accepted items for the Brewing Stand input slots.
  • #minecraft:mundane_potion_additions, which is used to convert Water Bottles to Mundane Potions in a brewing recipe.
• Added an optional attribute_modifiers field to the item.
  • Its value is the same as the list form of the minecraft:attribute_modifiers data component.

Item Behaviour Components

• Removed minecraft:attribute_modifiers.
  • Entries should be moved to the attribute_modifiers field on the item.

So if you had this:

{
  "behavior": {
    "minecraft:attribute_modifiers": [
      {
        "id": "example:tool.heavy",
        "type": "minecraft:gravity",
        "amount": 0.01,
        "operation": "add_value",
        "slot": "hand"
      }
    ]
  }
}

You now have to use this instead:

{
  "attribute_modifiers": [
    {
      "id": "example:tool.heavy",
      "type": "minecraft:gravity",
      "amount": 0.01,
      "operation": "add_value",
      "slot": "hand"
    }
  ]
}

• Removed minecraft:armor.
  • Entries should be moved to the attribute_modifiers field on the item.

So if you had this:

{
  "behavior": {
    "minecraft:armor": {
      "attribute_id": "minecraft:armor.chestplate",
      "defense": 8,
      "knockback_resistance": 0.0,
      "toughness": 2.0
    }
  }
}

You now have to use this instead:

{
  "attribute_modifiers": [
    {
      "id": "minecraft:armor.chestplate",
      "type": "minecraft:armor",
      "amount": 8.0,
      "operation": "add_value",
      "slot": "chest"
    },
    {
      "id": "minecraft:armor.chestplate",
      "type": "minecraft:armor_toughness",
      "amount": 2.0,
      "operation": "add_value",
      "slot": "chest"
    }
  ]
}

Recipes

Added the following recipe types:

• minecraft:brewing_amplify
• minecraft:brewing_modify

minecraft:brewing_amplify

• Transforms the item into another one after brewing.
• Format:
  • group: An optional string. Used to group recipes together.
  • base: An item. The item to transform.
  • addition: An ingredient. The items to accept to modify the item.
  • result: An item. The item to transform into.
• A remainder may be specified for the addition that is left in the slot or dropped in the world after brewing.

Example:

{
  "type": "minecraft:brewing_amplify",
  "addition": {
    "items": "minecraft:dragon_breath",
    "remainder": {
      "id": "minecraft:glass_bottle",
      "count": 1
    }
  },
  "base": "minecraft:splash_potion",
  "result": "minecraft:lingering_potion"
}

minecraft:brewing_modify

• Changes the potion present on the item into another one after brewing.
• Format:
  • group: An optional string. Used to group recipes together.
  • base: A potion. The potion to modify.
  • addition: An ingredient. The items to accept to modify the potion.
  • result: A potion. The potion to leave.
• A remainder may be specified for the addition that is left in the slot or dropped in the world after brewing.

Example:

{
  "type": "minecraft:brewing_modify",
  "addition": "minecraft:sugar",
  "base": "minecraft:awkward",
  "result": "minecraft:swiftness"
}