
Block Swap
A simple mod to replace a given block with another.
About this Mod
Block Swap is a simple mod that let's you replace one block with another. This works both during world gen and placing blocks in a live generated world.
Why would I want this?
Imagine this: You've installed 25 technology mods and you have 10 tin ores, 14 copper ores, 4 uranium ores, 10 lead ores, and 15 silver ores. Or maybe.... you've installed Oh The Biomes You'll Go and Biomes O' Plenty and don't like the fact that both mods add Redwood Logs.
Painful right? Now imagine a mod that let's you make these duplicate block a single block... yup you've just found it!
This mod allows you to replace Block A with Block B in its config and that's it.
But what about Block State properties?
This mod will remap the Block State properties from Block A's Block State to Block B's Block State(if the property is present).
Performance? Is this slow?
In my own profiling, it has NO performance hit.
Config
Config is reloaded each world load.
Available Versions
How to Install Block Swap on Your Server
Order Server
Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.20.1).
Install Mod
Open the mod browser in the dashboard and search for "Block Swap". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.20.1, 1.19.4, 1.19.3 (+3 more)
Server-side
✓ RequiredRecommended RAM
6 GB(min. 4 GB)Frequently Asked Questions
Block Swap server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.20.1). You can switch loaders with one click in the panel.
Is Block Swap compatible with fabric and forge?
Block Swap officially supports fabric, forge for Minecraft 1.20.1, 1.19.4, 1.19.3. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Block Swap – how to optimize performance?
Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Block Swap consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Block Swap with just one click on your server.
