Simple Block Replacer
by RedCraft86
Simple Block Replacer swaps chosen blocks for other blocks as chunks generate, so a world can keep one wood set and drop the rest.
What it does
Replacement rules are written in the blockreplacer.json5 config, which lists the block to replace and the block that takes its place. The mod was built to deduplicate blocks when several world-generation mods add similar sets, such as Biomes O' Plenty or Regions Unexplored, running in the same world. LanternLib is required and must be installed alongside it. Simple Block Replacer runs on the server alone, is published for NeoForge only and targets 1.21.1.
The replacement applies to blocks placed or generated after the mod is installed; terrain already present in a world is left unchanged. Because it is server-side only, players join without installing anything.
Key features
Block swapping on generation
Chosen blocks are replaced with other blocks as chunks generate in the world.
Duplicate set removal
A single wood or stone set can be kept while the matching blocks from other mods are replaced.
JSON5 configuration
Each replacement pair is defined in blockreplacer.json5, with no code changes needed.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
Simple Missing Replacer is also server-side only and open source under the MIT License, but it covers 1.21.1 – 1.21.5 rather than only 1.21.1. Vine Replacer is server-side only and shares the NeoForge loader and the 1.21.1 target, but its source is not public. Biome Replacer (Neoforge) is open source under the MIT License and covers 1.20.1 – 1.21.4 on Forge and NeoForge.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Simple Block Replacer | NeoForge | 1.21.1 | Server-side only | 2026-04-01 |
| Simple Missing Replacer | NeoForge | 1.21.1 – 1.21.5 | Server-side only | 2025-05-03 |
| Vine Replacer | NeoForge | 1.21.1 | Server-side only | 2026-09-01 |
| Biome Replacer (Neoforge) | Forge and NeoForge | 1.20.1 – 1.21.4 | Server-side only | 2025-02-28 |
Questions
Does Simple Block Replacer need LanternLib?
In the catalog
Simple Block Replacer is one of 8,515 World generation mods on ModsFinder, and one of 4,175 World generation mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from RedCraft86
Similar mods
What the author says
Block Replacer is a mod that lets you replace blocks in the world (upon chunk generation) with another block. The main intention of this mod is block deduplication. Imagine you have Biomes O' Plenty and Regions Unexplored at the same time. Well, you'd have 2 different sets of multiple wood types which is…
Official listing
- Modrinth page
- modrinth.com/mod/simple-block-replacer
- Owner
- RedCraft86
- Published
- 2026-01-27
- Updated on Modrinth
- 2026-04-01
- Facts verified
- 2026-10-15