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.

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. |

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.

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 |

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.