CurseForge · Minecraft mod
SL Library
Adds various base utilities, synchronization help, policy, packet sending and data driven
Quick answer
Which SL Library release should I use?
SL Library SL-Library-1.5.3-1.21.1+[NeoForge].jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is SL Library 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 SL Library SL-Library-1.5.3-1.21.1+[NeoForge].jar need?
SL-Library-1.5.3-1.21.1+[NeoForge].jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add SL Library without breaking your instance.
Built for SL Library SL-Library-1.5.3-1.21.1+[NeoForge].jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use SL-Library-1.5.3-1.21.1+[NeoForge].jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 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 SL-Library-1.5.3-1.21.1+[NeoForge].jar. It opens that exact file at the source.
About this project
What does SL Library add?
🔹SL Library
🧰 Core Library & Utilities
SL Library includes a internal library designed to support mod features such as synchronization, event handling, logic execution, and client-side rendering utilities.
⚙️ What does it provide?
The internal library is composed of multiple utility modules that handle:
- 🔄 Network synchronization (client ↔ server)
- 🎯 Event-driven systems for gameplay interactions
- 🧠 Conditional logic and execution systems
- 📦 File handling and configuration utilities
- ⚡ Command registration and processing
- 🎮 Input handling and player interaction events
- ✨ Custom particle systems (including text particles)
- 🧩 Compatibility and modular execution support
🌐 Networking System
Includes a complete packet-based synchronization layer:
- Sync custom data between client and server
- Handle cooldowns, tags, and state updates
- Support for particle and visual synchronization
🎯 Event System
Provides a wide range of events for gameplay interaction:
- Player input and movement
- Attack and combat behavior
- Targeting systems
- Client-side rendering and camera control
🧠 Logic & Execution System
A flexible logic framework built around reusable "statements":
- Player, entity, item, and equipment conditions
- Execution chains and conditional logic
- Sound and action triggers
✨ Particle System
Includes a custom particle engine with advanced features:
- Text-based particles
- Buffered rendering system
- Mathematical handlers for animation and positioning
🛠️ Utilities & Tools
Additional systems included:
- File reading and path building utilities
- Configuration management
- Command registration system
- Exception handling framework
- Rendering helpers and overlay utilities
🔹SL Data-Driven
Extends data reading, whether for resource packs, data packs via external folders, or early internal In-Jar reads
📁 Global Data-Driven Folders
SL Data-Driven provides two special global directories inside your .minecraft folder:
.minecraft/data_driven/resourcepacks
.minecraft/data_driven/datapacks
🔍 How it works
Anything placed inside these folders behaves as if it were built directly into the game or a mod.
The key advantage:
- Content is global
- Works across all worlds automatically
- No per-world installation required
📦 Resource Packs
Path:
.minecraft/data_driven/resourcepacks
- Store assets such as textures, models, animations, and similar files
- Behaves like a built-in resource pack
- No manual activation required
Resourcepack example:
📚 Data Packs
Path:
.minecraft/data_driven/datapacks
- Store datapacks and data-driven logic
- Works like standard datapacks
- Automatically loaded in all worlds
Datapacks example:
📦 Dependency Package System
SL Data-Driven introduces a dependency system that allows other mods to automatically add content using structured files (such as JSON) directly inside their .jar.
This makes it easy to create extensions, compatibility layers, and data-driven features without modifying the base mod.
🔍 How does it work?
The system is fully automatic:
Declare the dependency
Your mod must depend on "sl_data_driven" in its META-INF descriptor.Folder structure
Inside your mod, create the following path:
/data_driven/<your_mod_id>/
Add your files
Place any files you want SL Data-Driven to process (JSON, configs, etc.) inside that folder.Automatic loading
On startup, SL Data-Driven
- Detects all mods that depend on it
- Scans the /data_driven/ directory
- Loads the files as extensions
This allows collecting and reading files, but it does not add a base read; all file reading must be designed.
One way to confirm that it works is, for example, to check that your modid is listed here, in this case I added the mod (SL Library) to the Data-Driven
When valid:

When it is invalid:

✅ Minimum requirements
For your .jar to be recognized as a valid mod:
- It must include a META-INF descriptor
- It must use:
modLoader="lowcodefml"
🧪 Example configuration
modLoader="lowcodefml"
loaderVersion="[47,)"
license="All Rights Reserved"
[[mods]]
modId="your_modid"
displayName="Your Mod Name"
version="1.0"
authors="you"
[[dependencies.your_modid]]
modId="sl_data_driven"
mandatory=true
versionRange="*"
ordering="AFTER"
side="BOTH"
Project description from CurseForge.
Pick your setup
SL Library by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.21.1
1 loader build1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
SL Library versions and loaders
SL-Library-1.5.3-1.21.1+[NeoForge].jar
9 Aug 2026
SL-Library-1.5.3-1.20.1+[Forge].jar
9 Aug 2026
SL-Library-1.5.2-1.20.1+[Forge].jar
8 Aug 2026
SL-Library-1.5.2-1.21.1+[NeoForge].jar
8 Aug 2026
SL-Library-1.5.1-1.21.1+[NeoForge].jar
26 Jul 2026
SL-Library-1.5.1-1.20.1+[Forge].jar
26 Jul 2026
SL-Library-1.5-1.20.1+[Forge].jar
26 Jul 2026
SL-Library-1.5-1.21.1+[NeoForge].jar
22 Jul 2026
SL-Library-1.4.2-1.20.1+[Forge].jar
7 Jul 2026
SL-Library-1.4.2-1.21.1+[NeoForge].jar
7 Jul 2026
SL-Library-1.4.1-1.21.1+[NeoForge].jar
4 Jul 2026
SL-Library-1.4.1-1.20.1+[Forge].jar
4 Jul 2026
Looking for an older file? The official CurseForge project page is in Resources.