CurseForge · Minecraft mod
EntityJS
This mod uses KubeJS to dynamically register entities with full AI/Animation/Spawn Control support!
Quick answer
Which EntityJS release matches 1.21 NeoForge?
entityjs-1.5.0.jar targets 1.21, 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. 1 required mod needs a matching file.
Where it goes
Is EntityJS required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does entityjs-1.5.0.jar need?
entityjs-1.5.0.jar on 1.21 NeoForge. Every mod below is checked against that same setup.
Install GeckoLib, KubeJS, Better Advanced Tooltips, Rhino first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 2 come through another mod in the chain.
2 extra mods were pulled in by other dependencies. Indented rows show who needs each one. We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add EntityJS without breaking your instance.
Built for entityjs-1.5.0.jar on 1.21 NeoForge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use entityjs-1.5.0.jar. It targets 1.21, 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install GeckoLib, KubeJS, Better Advanced Tooltips, Rhino first, but 1 required mod has no matching file for this setup. Do not mix loader builds to force a match. 2 come through another mod in the chain.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside entityjs-1.5.0.jar. It opens that exact file at the source.
About this project
What does EntityJS add?

Key Features
- Dynamic Entity Registry: Easily register custom entities and define their attributes and behaviors using JavaScript.
- Entity Modification: Modify existing entity methods with the entity modification event for further customization.
- Full Animation Support: Enjoy smooth and lifelike animations for your entities, utilizing LioLib, a Geckolib 4 fork backporting many fixes to the unsupported 1.19.2 version
(EntityJS 1.20.1+ uses Geckolib as a direct dependency because it is a supported version)
- Spawn Control: Take full control over entity spawning by specifying spawn conditions, rates, and locations.
- Attribute Modification: Fine-tune entity attributes such as health, speed, damage, and more to suit your gameplay needs.
- Full AI Support: Easy access to mob goals and brain logic via the server ai
- Full AI Support: Easy access to mob goals and brain logic via the server AI events.
Special Compatibility
KubeJS Iron's Spells
Visit KubeJS Iron's Spells Mod Page
- Spellcasting Mobs: You can make any Mob cast spells by using the Goal event to attach spellcasting behavior.
- Custom Spellcasters: Create fully custom spellcasting mobs with tailored AI, spell sets, and behaviors.
- Spell Projectiles: Define and control custom spell projectiles for advanced combat and visual effects.
Community
Join the official KubeJS Discord community to connect with other users, share your creations, and get help with any questions or issues you encounter while using EntityJS. Alternatively, you can click the Discord icon below:
Youtube Tutorials:
Project description from CurseForge.
Pick your setup
EntityJS by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
1 loader build1.21
1 loader build1.20.1
3 loader builds1.19.2
2 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
EntityJS versions and loaders
entityjs-1.5.0.jar
30 Jul 2026
entityjs-1.4.9.jar
29 Jul 2026
entityjs-1.4.8.jar
21 Jul 2026
entityjs-1.4.7.jar
4 Jul 2026
entityjs-1.4.6-1.21.jar
20 Jun 2026
entityjs-1.4.5-1.21.jar
23 Mar 2026
entityjs-1.4.4-1.21.jar
5 Dec 2025
entityjs-1.4.3-1.21.jar
1 Nov 2025
entityjs-1.4.2-1.21.jar
20 Oct 2025
entityjs-1.4.1-1.21.jar
15 Oct 2025
entityjs-1.4.0-1.21.jar
13 Oct 2025
entityjs-1.3.9-1.21.jar
24 Aug 2025
Looking for an older file? The official CurseForge project page is in Resources.