CurseForge · Minecraft mod
Leiv's API
Leiv's API is the mandatory, highly reliable core library that manages configurations, validation, and system rules for all mods created by Leiv.
Quick answer
Which Leiv's API release should I use?
Leiv's API_Forge_1.20.1 (v.1.0.0) targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 1 required mods have matching files.
Where it goes
Is Leiv's API 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 Leiv's API_Forge_1.20.1 (v.1.0.0) need?
Leiv's API_Forge_1.20.1 (v.1.0.0). Change the file and its required mods may change too.
Install Leiv's Lib first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Leiv's API without breaking your instance.
Built for Leiv's API_Forge_1.20.1 (v.1.0.0). Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use Leiv's API_Forge_1.20.1 (v.1.0.0). It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Leiv's Lib first. We found matching files for this game-version and loader setup.
- 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 Leiv's API_Forge_1.20.1 (v.1.0.0). It opens that exact file at the source.
About this project
What does Leiv's API add?
🧠 Leiv's API
Leiv's API is the central brain and logical framework of the Leiv Ecosystem Suite.
While Leiv's Lib provides the mathematical and structural foundation, Leiv's API handles the intelligence. It is a pure logic and configuration framework designed to completely eliminate messy, repetitive config code across all my mods. By centralizing settings management, this API ensures that all mods in the Leiv Ecosystem (like ItemCuller and others) are incredibly stable, highly configurable, and perfectly synchronized.
⚠️ PLAYER NOTE: This is a required core dependency for mods within the Leiv Ecosystem. It does not add content on its own, but must be installed alongside any of my utility mods to handle their configurations and logic!
✨ Key Features
- ⚙️ Centralized Configurations: Instead of every mod reading and writing its own chaotic config files, Leiv's API handles everything through a single, unified system.
- 💾 Rock-Solid Persistence: Guarantees safe, efficient, and corruption-proof JSON saving and loading directly within your game's
config/folder. - 🧩 Seamless Mod Synergy: Creates a standardized ruleset that allows all my mods to communicate their settings seamlessly to each other (and eventually to the GUI).
- 🛡️ Error-Free Validation: Built-in intelligent validation ensures that invalid config entries or user errors are caught instantly before they can crash the game.
🛠️ Technical Highlights (For Developers & Modpack Creators)
Leiv's API provides a completely decoupled, game-code-free architecture for maximum maintainability:
- 🧠 The RuleEngine: A robust, 100% unit-testable engine that processes and manages the entire configuration logic without relying on direct game code.
- 📐 ValueRule<T> System: Generic configuration objects that support built-in validation and dynamic
onChangeevent listeners for instant in-game updates. - 📋 RuleLayouts: A powerful system for logically grouping settings into categories, making dynamic UI generation (via Leiv's Config Menu) a breeze.
- ⏱️ High-Speed I/O: Optimized file reading and writing processes to ensure that loading mod configurations never slows down the game startup.
🔗 Dependencies
To keep the ecosystem clean and modular, this API relies on the foundational framework:
- Requires: Leiv's Lib (Make sure this is installed!)
- Used By: Leiv's Network, Leiv's Config Menu, ItemCuller, and all other Leiv Ecosystem end-mods.
💬 Community & Support
Got questions, feedback, or need to report a bug? Join the community!
- 👥 Discord: Join Leiv's Community
- 🐛 Issue Tracker: Report bugs via the official Discord ticket system.
Project description from CurseForge.
Pick your setup
Leiv's API by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
1 loader build26.1.2
1 loader build1.21.1
2 loader builds1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Leiv's API versions and loaders
Leiv's API_Forge_1.20.1 (v.1.0.0)
Leiv's API_Forge_1.20.1 (v.1.0.0).jar
19 Aug 2026
Leiv's API_Forge_1.21.1 (v.1.0.0)
Leiv's API_Forge_1.21.1 (v.1.0.0).jar
19 Aug 2026
Leiv's API_NeoForge_26.2 (v.1.0.0)
Leiv's API_NeoForge_26.2 (v.1.0.0).jar
19 Aug 2026
Leiv's API_NeoForge_26.1.2 (v.1.0.0)
Leiv's API_NeoForge_26.1.2 (v.1.0.0).jar
19 Aug 2026
Leiv's API_NeoForge_1.21.1 (v.1.0.0)
Leiv's API_NeoForge_1.21.1 (v.1.0.0).jar
18 Aug 2026
Leiv's API_NeoForge_1.21.1 (v.1.0.0)
Leiv's API_NeoForge_1.21.1 (v.1.0.0).jar
14 Aug 2026
Looking for an older file? The official CurseForge project page is in Resources.