CurseForge · Minecraft mod
project-1657894
Have Multiple Mods That Add The Same Effect Swap Them Out!
Quick answer
Which project-1657894 release should I use?
project-1657894 effectswapper-4.0.0.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is project-1657894 required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does project-1657894 effectswapper-4.0.0.jar need?
effectswapper-4.0.0.jar. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add project-1657894 without breaking your instance.
Built for project-1657894 effectswapper-4.0.0.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use effectswapper-4.0.0.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside effectswapper-4.0.0.jar. It opens that exact file at the source.
About this project
What does project-1657894 add?
Effect Swapper lets you control and replace Minecraft And Modded status effects using simple JSON files. Have multiple mods that add “Bleeding”? Choose which one you want to keep and replace or disable the others. You can also control the effect duration and level.
How To Swap

EFFECTS (POTIONS ARROWS ETC...)
[
{
"input": "minecraft:poison",
"output": "minecraft:wither",
"enabled": true,
"keep_duration": true,
"keep_amplifier": true
},
{
"input": "minecraft:strength",
"output": "minecraft:weakness",
"enabled": true,
"keep_duration": true,
"keep_amplifier": false,
"output_amplifier": 5
}
]
Top Example: Poison II 0:45 -> Wither II 0:45
Bottom Example: Strength 2:00 -> Weakness VI 2:00

MOBS (BEES HUSKS ETC...)
[
{
"source": "minecraft:bee",
"input": "minecraft:poison",
"output": "minecraft:wither",
"enabled": true,
"keep_duration": true,
"keep_amplifier": true
},
{
"source": "minecraft:husk",
"input": "minecraft:hunger",
"output": "minecraft:poison",
"enabled": true,
"keep_duration": true,
"keep_amplifier": true
}
]

Putting 5 in the Output doesn't mean you'll get effect level 5 it will add 5 to the pre-existing level
Project description from CurseForge.
Pick your setup
project-1657894 by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
project-1657894 versions and loaders
effectswapper-4.0.0.jar
18 Aug 2026
effectswapper-3.0.0.jar
18 Aug 2026
effectswapper-2.0.0.jar
18 Aug 2026
effectswapper-1.0.0.jar
18 Aug 2026
Looking for an older file? The official CurseForge project page is in Resources.