Persistent Spawner Reset

Persistent Spawner Reset is a KubeJS server script for Minecraft 1.20.1 that automatically restores broken mob spawners after a configurable delay.

The script preserves the original spawner data, temporarily keeps the required chunk loaded, and persists pending restorations across server restarts and world reloads.

Features

• Automatic Spawner Restoration — Broken mob spawners automatically return after a configurable amount of time.
• Original Spawner Data Preservation — The original spawner NBT is preserved, including the entity assigned to the spawner and its configuration.
• Persistent Restorations — Pending spawners are saved and recovered after server restarts or world reloads.
• Remaining Time Preservation — The restoration countdown continues from the remaining time after the server or world is loaded again.
• Automatic Chunk Loading — The affected chunk is temporarily kept loaded while a spawner is waiting to be restored.
• Automatic Chunk Cleanup — The forced chunk is released when all pending spawners inside it have been restored.
• Multiple Spawner Support — Multiple broken spawners can be tracked simultaneously, including multiple spawners inside the same chunk.
• Forced Restoration — When the timer expires, the original spawner is restored even if another block has been placed in its original position.
• Dimension Support — Spawners are tracked together with their dimension and coordinates.

Configuration

The restoration delay can be changed directly at the beginning of the script.

By default:

3 minutes = 3600 ticks

Minecraft runs at 20 ticks per second, so the value can easily be adjusted to use a different restoration time.

Installation

1. Install KubeJS for Minecraft.
2. Download the Persistent Spawner Reset ZIP file.
3. Extract the downloaded ZIP file.
4. Move spawner-reset.js to:

kubejs/server_scripts/

1. Restart the server or world.

The script is intended to run on the server side.

Updating

When updating to a newer version, replace the existing spawner-reset.js file inside kubejs/server_scripts/ with the new version and restart the server.

Requirements

• Minecraft: 1.20.1
• Mod Loader: Fabric
• Java: 17
• KubeJS — Required

Notes

This script is designed for worlds and servers where mob spawners should act as renewable structures instead of being permanently destroyed.

Pending restorations are stored persistently, preventing a server restart or world reload from permanently removing a spawner that was already scheduled to return.

Credits

Created by zclashtm.