Backslot Mod: Json Generator
This mod lets you generate json files for making resource packs or mods compatible with the Backslot Mod through an interactive GUI.
How to use:
Step 1: Install the mod and join a world.
Step 2: Open the pause menu.
Step 3: Press the button in the top left corner of your screen.
Step 4: Configure as you wish and press the Generate File button, which will generate a new file located at YOUR MODPACK FOLDER/back_transforms/YOUR_ITEM.json.
Step 5: Put that file into your resource pack or mod (for mods under assets/MOD_ID/back_transforms).
Congratulations! You should now see the item properly positioned when in the Backslot.
Make sure to use the Backslot Mod so you can see the changes in-game!
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.11
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as backslot_json_gen-1.0.0.jar — drop this file into the mods folder
- Download size: 30 KB
- Download link checked 21 Aug 2026 — working
These come from our own check of the pack file, not from the source page.