
Exclusions Lib
A library for reducing headaches when working with json, and to give datapack makers new levers to play with!
About this Mod
A library for giving you more levers to use in vanilla json files.
Everything here is only needed on the server, and not the client, so feel free to build your datapacks based off of this!
Current Features:
-A new block predicate, exclusions_lib:overlaps_structure:
This predicate will take a block position (adjusted by an optional offset field, like most other predicates), and optionally a structures and/or range, and check whether it would overlap a structure. With a structures field, it only checks for certain structures, and with a value for a range (max 32), it will instead check an area around the position.
Use this to stop features from being placed overlapping structures! Or maybe you'd want an ore that only generates near a certain structure?
-Tag Exclusions (NOT IN NEOFORGE VERSION AS NEO ALREADY HAS THESE BUILT IN):
Basically a blacklist field for tags. Want to make a tag that contains everything in #minecraft:small_flowers, except for wither roses? But you still want it to be compatible with every other mod that would add new flowers? Just add wither roses with its "excluded" field set to true, and now you've made a "normal flowers" tag! Is very powerful, allowing you to do all sorts of things, like removing other mod's edge case items from your own tags, while still keeping their item in the common tag you're pulling from, or even straight up removing entries from other mods' tags (or vanilla) yourself!
Example Usage, for a tag that will contain everything in #minecraft:small_flowers, EXCEPT for wither roses, along with a couple other things:
"values": [
"#minecraft:small_flowers",
{
"id": "minecraft:wither_rose",
"excluded": true
},
"minecraft:apple",
"minecraft:waxed_exposed_cut_copper_stairs"
]
}```
Available Versions
How to Install Exclusions Lib on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.6).
Install Mod
Open the mod browser in the dashboard and search for "Exclusions Lib". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.6, 1.21.1, 1.20.1
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Exclusions Lib server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.6). You can switch loaders with one click in the panel.
Is Exclusions Lib compatible with fabric and forge and neoforge?
Exclusions Lib officially supports fabric, forge, neoforge for Minecraft 1.21.6, 1.21.1, 1.20.1. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Exclusions Lib – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Exclusions Lib consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Exclusions Lib with just one click on your server.