Formations (Structure Library)
Formations adds utilities for structure datapacks!
About this Mod
Formations is a library mod which adds additional features to datapacks for generating structures!
Features
Structure Types
Formations adds two new structure types: formations:simple and formations:pieced. These essentially correspond to the vanilla regular and jigsaw structure types, but with better placement and a clearer json format.
Both types can choose from the following placements:
| Identifier | Description |
|---|---|
surface |
Will place the structure at the top layer of solid blocks |
ceiling |
Will place the at the bottom layer of solid blocks |
on_water |
Will place the structure at the top layer of blocks if those blocks are water |
on_lava |
Will place the structure at the top layer of blocks if those blocks are lava |
underground |
Will place the structure somewhere between the top and bottom layers of blocks |
underground_surface |
Will place the structure between the top and bottom layers of blocks, at the bottom of an open area |
underground_ceiling |
Will place the structure between the top and bottom layers of blocks, at the top of an open area |
underground_buried |
Will place the structure between the top and bottom layers of blocks, such that it is not exposed to any open area |
underground_on_lava |
Will place the structure between the top and bottom layers of blocks, in an open area on top of lava |
Structure Pool Element Types
Formations adds one new structure pool element type, formations:single_pool_element. The element type allows setting a different ground level rather than vanilla's fixed ground level of 0. The ground level can be set through the ground_level key.
Structure Processors
Formations adds a bunch of new structure processors.
| Identifier | Parameters | Description |
|---|---|---|
formations:random_bed_color |
- | Randomizes the color of any beds |
formations:biome_replacements |
- | Replaces certain blocks, such as wood, bricks and grass, based on the biome |
formations:fill_brewing_stands |
slotFillChance, maxBlazePowder |
Fills brewing stands with random potions and blaze powder ` |
formations:fill_chiseled_bookshelves |
slotFillChance |
Fills chiseled bookshelves with enchanted books |
formations:block_age |
mossiness, degradation, disintegration |
Randomly replaces regular blocks with mossy or cracked variants, full blocks with slabs or stairs, random blocks with air |
formations:random_plant_growth |
minGrowth, maxGrowth |
Randomizes the growth stage of any crops |
formations:respawn_anchor_charges |
minCharges, maxCharges |
Randomizes the number of charges of any respawn anchors |
formations:waterlogging |
handling |
Determines whether waterloggable blocks are waterlogged, options can be found on GitHub |
Examples
For examples usage of the features, you can check out 
Formations Overworld and 
Formations Nether
FAQ
Can I use your mod in my modpack?
Yes, feel free to use my mod in your modpack
Discord
For future content, upcoming mods, and discussion, feel free to join the SuperMartijn642 discord server!
Available Versions
How to Install Formations (Structure Library) on Your Server
Order Server
Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (26.2).
Install Mod
Open the mod browser in the dashboard and search for "Formations (Structure Library)". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.2, 26.1.2, 26.1.1 (+22 more)
Server-side
✓ RequiredRecommended RAM
6 GB(min. 4 GB)Frequently Asked Questions
Formations (Structure Library) 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 4 GB RAM is allocated and the loader matches the mod version (26.2). You can switch loaders with one click in the panel.
Is Formations (Structure Library) compatible with fabric and forge and neoforge and quilt?
Formations (Structure Library) officially supports fabric, forge, neoforge, quilt for Minecraft 26.2, 26.1.2, 26.1.1. 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 Formations (Structure Library) – how to optimize performance?
Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Formations (Structure Library) 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.
Similar Mods
Rent Modded Server
Install Formations (Structure Library) with just one click on your server.