Stack Manager
Configurable stack sizes (vanilla + mods)
A lightweight server-side mod that generates a config with all items (vanilla + modded) and lets you set the max stack size per item. Works in singleplayer (integrated server) and on dedicated servers.
Features
- Generates config/stackmanager_items.json with every registered item.
- Per-item stack limits you can edit at any time.
- Auto-adds new items from newly installed mods on startup/reload.
- Safe network cap = 99 to avoid protocol/NBT issues.
- Optional in-game commands (enabled when Fabric API is present).
Commands
(optional, require Fabric API)
/stackmanager reload — reload the config and append any missing items.
/stackmanager set — set a new limit (clamped to 99).
/stackmanager set default — restore the game/mod default (clamped to 99).
Without Fabric API the mod still works; edit the file and restart (or reload using your preferred method).
Config file
Path: config/stackmanager_items.json
{
"formatVersion": 1,
"items": {
"minecraft:acacia_button": 64,
"minecraft:oak_planks": 99
}
}
- Keys are full item IDs (namespace:item).
- Values are clamped to 1–99 at load time.
Handy editor shortcuts
(VS Code / most editors; Windows/Linux = Ctrl, macOS = Cmd unless noted)
Format document:
Shift+Alt+F (Win/Linux) · Shift+Option+F (macOS)
- Find / Replace:
Ctrl+F / Ctrl+H · Cmd+F / Cmd+Alt+F
-Select next occurrence (multi-cursor):
Ctrl+D · Cmd+D
- Go to line:
Ctrl+G · Cmd+G
- Select word / line:
Ctrl+W (word) / Ctrl+L (line) · Option+Shift+→/← or Cmd+L (macOS)
Tips
- Keep IDs alphabetized for easier diffs.
- Use regex replace in Ctrl+H to mass-edit values.
- After editing, run /stackmanager reload (if commands available) or restart the world/server to apply changes.
Compatibility & limits
- The mod enforces limits on the server; clients don’t need the mod (unless other mods require it).
- Items with different NBT (custom names, enchantments, damage, etc.) never stack, by vanilla rules.
- Most vanilla and modded GUIs respect these limits. If a specific mod screen still caps at 64/99, report it—small per-screen patches are possible.
- Values above 99 are intentionally reduced to 99 to keep networking stable.
Requirements
Fabric API: optional but recommended for better experience (enables /stackmanager commands and smoother reloading).
Recommended usage
- Install Fabric API (recommended, not required) to use in-game commands and improve quality of life.
- Edit values directly in the config file before starting a world/server. Command-based changes—especially without Fabric API—can be cumbersome and may require restarts or extra steps.
Ideas for using the mod
- Potions:
Easier: set potions to 16 or 32 per slot
minecraft:potion: 16
minecraft:splash_potion: 16
minecraft:lingering_potion: 8–16
Benefit: fewer inventory trips during raids, mining, and boss fights.
Note: Potions carry NBT (effect type). Only identical potions stack.
Other quick ideas
- Builder / mega-projects (QoL):
- Blocks (stone, planks, glass, terracotta) 99; food 64–99; firework_rocket 64–99.
- Exploration / Elytra:
Rockets 16 (harder) or 64–99 (easier); Ender Pearls 16–32 (easier) or 8 (harder).
- Combat / PvE:
arrow 99; snowballs/eggs 64–99 for events/minigames.
- Economy / survival challenge:
Ores/ingots 16; ore blocks 8; pearls/snowballs 8 to curb spam
FAQ
- How do I find an item ID?
Enable advanced tooltips with F3 + H, then hover the item: you’ll see namespace:item.
No. For network safety the effective cap is 99.
Both. In singleplayer, drop the mod into mods/. On a dedicated server, only the server needs the mod.
