How do I install Nucleus-Editor?

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. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does Nucleus-Editor work with?

The listing gives Minecraft 1.21, 1.21.1, 1.21.2, among others. This is the version stated by the author or source site, not something we verified ourselves.

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Nucleus-Editor

by Smartin-b · on Modrinth

Which build do you need?

This mod ships a separate file for every mod loader and every version of the game. Pick both, then download — the wrong build installs fine and then does nothing in the game.

Mod loader

Mod loader Fabric1 build
Mod loader NeoForge1 build
Mod loader Quilt1 build

Minecraft version

Minecraft 1.21–1.21.5Newest

Minecraft 1.21–1.21.5Newest

Minecraft 1.21–1.21.5Newest

⬇ Download for 1.21–1.21.5 · Fabric ⬇ Download for 1.21–1.21.5 · NeoForge ⬇ Download for 1.21–1.21.5 · Quilt

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

This is a lightweigt implementation of dear imguis java libs, also containing a render callback for mods to subscribe to. can be used via

maven { url 'https://maven.uuid.gg/releases' }

modApi("com.redpxnda.nucleus:nucleus-editor-fabric:${rootProject.minecraft_version}+${rootProject.nucleus_editor_version}")

jarjaring it is fully allowed if desired, altough a fair warning, at this point in time there seem to be some conflict with other imgui shipping mods like veil. we are looking into resolving these without just shipping the same imgui version if possible, as wed prefer a stable solution. we recommend to use the proper maven for mod-devs, as it pulls dependencies properly

on neoforge

    forgeRuntimeLibrary("io.github.spair:imgui-java-binding:$imgui_version")
    forgeRuntimeLibrary("io.github.spair:imgui-java-lwjgl3:$imgui_version") {
        exclude group: 'org.lwjgl'
        exclude group: 'org.lwjgl.lwjgl'
    }

    forgeRuntimeLibrary("io.github.spair:imgui-java-natives-linux:$imgui_version")
    forgeRuntimeLibrary("io.github.spair:imgui-java-natives-macos:$imgui_version")
    forgeRuntimeLibrary("io.github.spair:imgui-java-natives-windows:$imgui_version")

Is also required for the runtime non-mod libraries.
In 1.0.0 we use imgui version 1.88.0
For more information on Nucleus see this readme

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21, 1.21.1, 1.21.2
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.

Verified by MCModsHub

Ships as nucleus-editor-forge-1.21+1.0.0.jar — drop this file into the mods folder
Download size: 9.6 MB
Download link checked 5 Sept 2026 — working

These come from our own check of the pack file, not from the source page.

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