Description
Gallery
Changelog
Versions
What is Data Attributes?
Data Attributes is a Minecraft mod, initially released for Minecraft 1.17.1 using the Fabric ecosystem. The mod does two things: overhauls Minecraft's entity attribute system to be more dynamic and to include follow on attributes (something found in many other games); and exposes entity attributes to datapack manipulation - allowing servers/pack makers easy customisation of every aspect of the entity attribute system.
Why
Originally, Data Attributes existed as part of the PlayerEx mod. However, the system implemented in 1.16.5 was the "first draft", and was clunky and badly optimised (not to mention full of bugs). My mod group and I wanted to use this datapack attributes system as part of some other mods that we were working on, so I developed this as a more robust and standalone project.
Usage
By itself, this mod adds no in-game content. It simply allows entity attributes to be customised/added using datapacks. Please read the wiki before using the mod.
Notice
Data Attributes is not compatible with AttributeFix - they have the same capabilities!
Wiki
For documentation, please head over to the wiki
All Versions
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[1.4.6+1.19.2] 1.4.6+1.19.2
by clevernucleus on Oct 14, 2026
Download
### Changelog
This change does not impact end-users (who can continue to use this on more recent loader releases), only developers.
- Reverted back to Fabric Loader
0.14.10as config dependencies built using newer versions seem to not work in the dev environment.
This change does not impact end-users (who can continue to use this on more recent loader releases), only developers.
[1.4.5+1.19.2] 1.4.5+1.19.2
by clevernucleus on Oct 14, 2026
Download
### Changelog
This is primarily a bug-fixing and optimisation update.
This is primarily a bug-fixing and optimisation update.
- Changed the way
/reloadworks to refresh attributes:
- No longer saves the
updateFlagto the level's nbt data. - No longer injects the
updateFlaginto vanilla packets. - Instead, we only use the
updateFlagin runtime - not saving it at all, anywhere.
- Fixed [#80](https://github.com/CleverNucleus/data-attributes/issues/80): attribute tracking is handled differently now.
- Likely fixed an incompatibility between Data Attributes and ReplayMod: we no longer mess around with world properties at all.
- May* have fixed long-standing issues [24](https://github.com/CleverNucleus/data-attributes/issues/24) and [10](https://github.com/CleverNucleus/data-attributes/issues/10): almost all networking has been removed - now we only send/receive two custom packets in the whole mod: on game join and when
/reloadis executed.
- Various performance improvements.
[1.4.4+1.19.2] 1.4.4+1.19.2
by clevernucleus on Oct 14, 2026
Download
### Changelog
+Added hierarchy entity types that can be used to apply attributes to all entities that are an instance of an entity class. Currently supported types are as follows:
| **Identifier** | **Class Type** |
| -------------- | -------------- |
|
|
|
|
|
|
These have a hierarchy of:
``
+Added hierarchy entity types that can be used to apply attributes to all entities that are an instance of an entity class. Currently supported types are as follows:
| **Identifier** | **Class Type** |
| -------------- | -------------- |
|
dataattributes:living_entity | LivingEntity ||
dataattributes:mob_entity | MobEntity ||
dataattributes:path_aware_entity | PathAwareEntity ||
dataattributes:hostile_entity | HostileEntity ||
dataattributes:passive_entity | PassiveEntity ||
dataattributes:animal_entity | AnimalEntity |These have a hierarchy of:
``
LivingEntity
┗ MobEntity
┗ PathAwareEntity
┣ HostileEntity
┗ PassiveEntity
┗ AnimalEntity
This feature is useful for when you want to modify the attributes of many different mobs, but do not know every mob's
[1.4.3+1.19.2] 1.4.3+1.19.2
by clevernucleus on Oct 14, 2026
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### Changelog
+Fixed minor bug that could sometimes result in max health percentages being incorrectly calculated if the Player spam died.
+Fixed minor bug that could sometimes result in max health percentages being incorrectly calculated if the Player spam died.
[1.4.2] 1.4.2
by clevernucleus on Oct 14, 2026
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Fixed client attribute sync issue present in previous release.
[1.3.2] 1.3.2
by clevernucleus on Oct 14, 2026
Download
Fixed client attribute sync issue present in previous release.
[1.4.1] 1.4.1
by clevernucleus on Oct 14, 2026
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- Changed how datapack is synced S2C:
Before, sent raw NBT through network. Now:
1. converts NBT to SNBT;
2. uses Java's Deflater to compress the SNBT;
3. converts the compressed SNBT to byte array;
4. sends the byte array over network;
5. Reverses this using java's Inflater on the client.
This reduces the raw NBT network packet from aprox. 4KB to ~0.9KB. This was done in attempt to fix packet size issue with Velocity plugin, but also in general the player connection packet has the potential to get really massive really quickly depending on the datapack.
- Removed version checking between client and server. This was done in an attempt to make this compatible with Velocity plugin, which tends to get upset if we use regular Minecraft's connection packets.
- Changed MutableIntFlag to be implemented further up in the hierarchy (MutableWorldProperties). Added relevant casting checks. This is an attempt to fix bugs caused when other mods want to make 'dummy world properties' that don't respect the world properties hierarchy nor the client/server divide.
+Incremented version.
[1.3.1] 1.3.1
by clevernucleus on Oct 14, 2026
Download
- Changed how datapack is synced S2C:
Before, sent raw NBT through network. Now:
1. converts NBT to SNBT;
2. uses Java's Deflater to compress the SNBT;
3. converts the compressed SNBT to byte array;
4. sends the byte array over network;
5. Reverses this using java's Inflater on the client.
This reduces the raw NBT network packet from aprox. 4KB to ~0.9KB. This was done in attempt to fix packet size issue with Velocity plugin, but also in general the player connection packet has the potential to get really massive really quickly depending on the datapack.
- Removed version checking between client and server. This was done in an attempt to make this compatible with Velocity plugin, which tends to get upset if we use regular Minecraft's connection packets.
- Changed MutableIntFlag to be implemented further up in the hierarchy (MutableWorldProperties). Added relevant casting checks. This is an attempt to fix bugs caused when other mods want to make 'dummy world properties' that don't respect the world properties hierarchy nor the client/server divide.
+Incremented version.
[1.4.0] 1.4.0
by clevernucleus on Oct 14, 2026
Download
+Added multiplier based attribute functions.
Why: among other things such as being a requested enhancement, flat Attack Speed buffs are too OP and really need a multiplier type mechanic.
How: when defining attribute functions in JSON, instead of the value being a number/double, it is an object containing aforementioned number as well as a FunctionBehaviour reference. This lets the game know how the value should be used.
This is a breaking change, hence the buff in middle version number. All mods/datapacks will need to adjust their data JSON accordingly.
Why: among other things such as being a requested enhancement, flat Attack Speed buffs are too OP and really need a multiplier type mechanic.
How: when defining attribute functions in JSON, instead of the value being a number/double, it is an object containing aforementioned number as well as a FunctionBehaviour reference. This lets the game know how the value should be used.
This is a breaking change, hence the buff in middle version number. All mods/datapacks will need to adjust their data JSON accordingly.
[1.3.0] 1.3.0
by clevernucleus on Oct 14, 2026
Download
+Added multiplier based attribute functions.
Why: among other things such as being a requested enhancement, flat Attack Speed buffs are too OP and really need a multiplier type mechanic.
How: when defining attribute functions in JSON, instead of the value being a number/double, it is an object containing aforementioned number as well as a FunctionBehaviour reference. This lets the game know how the value should be used.
This is a breaking change, hence the buff in middle version number. All mods/datapacks will need to adjust their data JSON accordingly.
Why: among other things such as being a requested enhancement, flat Attack Speed buffs are too OP and really need a multiplier type mechanic.
How: when defining attribute functions in JSON, instead of the value being a number/double, it is an object containing aforementioned number as well as a FunctionBehaviour reference. This lets the game know how the value should be used.
This is a breaking change, hence the buff in middle version number. All mods/datapacks will need to adjust their data JSON accordingly.
[1.2.8] 1.2.8
by clevernucleus on Oct 14, 2026
Download
No changelog was specified.
[1.1.13] 1.1.13
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.7] 1.2.7
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.6] 1.2.6
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.1.12] 1.1.12
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.5] 1.2.5
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.4] 1.2.4
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.3] 1.2.3
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.1.11] 1.1.11
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.2] 1.2.2
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.1.10] 1.1.10
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.1] 1.2.1
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.2.0] 1.2.0
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.1.9] 1.1.9
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.1.8] 1.1.8
by clevernucleus on Oct 14, 2026
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No changelog was specified.
[1.1.7] 1.1.7
by clevernucleus on Oct 14, 2026
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No changelog was specified.
