Banned Items Mod

NeoForge 21.1.220 | Minecraft 1.21.1 | Server-Side Only

A lightweight server-side mod that lets operators ban specific items by their full item fingerprint (registry ID + all data-components / NBT). Banned items are automatically destroyed wherever they appear: inventory, cursor, ground, crafting table, or anvil.

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Commands (requires operator level 2)

Command	Description
/banhanditem	Ban the item currently in your main hand. Deletes the item from your hand and scans the rest of your inventory for copies. Saves to config immediately.
/unbanhanditem	Unban the item currently in your main hand.
/banneditemslist	Print all currently banned items to chat.
/reloadbanneditems	Reload config/banneditems.json without restarting the server.

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How banning works

1. Hold an item and run /banhanditem.
2. The mod serialises the full item (item ID + every data-component such as enchantments, custom name, lore, potion effects, etc.) to SNBT and stores it in config/banneditems.json.
3. From that moment, any item stack that matches both the item type and all data-components is considered banned.
4. Banning is exact-match: a Diamond Sword with Sharpness V is a different entry from a plain Diamond Sword. This lets you ban specific hacked items without affecting normal ones.

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Enforcement

Trigger	Action
Inventory sweep (every 1 s)	Removes banned items from all 41 inventory slots and the cursor slot
Crafting output	Zeroes the result stack so the player receives nothing
Right-click on block / in air	Event cancelled; item cannot be used
Left-click / attacking	Event cancelled
Item pickup from ground	Item entity discarded immediately
Anvil (repair / rename)	Output blocked

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Config file

config/banneditems.json — a JSON array of SNBT strings.

[
  "{id:\"minecraft:diamond_sword\",count:1}",
  "{id:\"minecraft:tnt\",count:1,components:{\"minecraft:custom_name\":\"{\\\"text\\\":\\\"Super TNT\\\"}\"} }"
]

You can hand-edit this file and run /reloadbanneditems to apply changes without restarting.

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