RemapIDs

Remap any item, block, fluid, or entity ID to another — data-driven, zero-config code.

RemapIDs is a utility mod for modpack developers that lets you redirect registry IDs throughout the entire game using simple JSON files. Unify duplicate ores across mods, replace deprecated items, or migrate worlds between mod versions — all without writing a single line of code.

Features

Registry Remapping
Remap across 7 registry types:

• Blocks, Items, Fluids, Entity Types
• Tags, Recipes, Loot Tables

Remaps are applied deeply — recipes, loot tables, tags, NBT data in inventories and containers are all automatically rewritten.

Data-Driven Configuration
Drop JSON files into config/remapids/remaps/ and you're done:

{
  "remaps": [
    {
      "source": "iceandfire:silver_ingot",
      "target": "othermod:silver_ingot",
      "types": ["item", "recipe", "loot_table"]
    }
  ]
}

Wildcard Patterns
Bulk-remap entire families of items with a single rule:

{
  "source": "iceandfire:silver_*",
  "target": "othermod:silver_*"
}

Tag-to-Item Recipe Conversion
Replace tag ingredients in recipes with specific items:

{
  "source": "#forge:ingots/silver",
  "target": "othermod:silver_ingot",
  "types": ["recipe"]
}

Smart Chain Resolution
If A remaps to B and B remaps to C, the mod automatically flattens this to A→C. Circular dependencies are detected and rejected.

Live Reloading
Tag, recipe, and loot table remaps are reapplied on /reload — no restart needed.

Zero Runtime Overhead
Block, item, fluid, and entity remaps are applied as registry aliases at startup. After that, there's no performance cost.

Supported Versions

Use Cases

• Ore unification — Redirect all silver ingots from 5 different mods to one canonical ID
• Mod migration — Swap out a removed mod's items for replacements without breaking existing worlds
• Loot/recipe cleanup — Rewrite loot tables and recipes to use the items you want
• World upgrades — Items already in inventories and containers are remapped via NBT on load

Getting Started

1. Install the mod for your loader
2. Create config/remapids/remaps/ if it doesn't exist
3. Add any number of .json files with your remap definitions
4. Launch the game — remaps are applied automatically