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Katton

Hot-reloadable Kotlin scripting for Minecraft Fabric, NeoForge, and Paper

Quick Start

API Docs

Katton Live Preview

What can Katton do

Check out those snippets to get a quick glimpse of what Katton's capable of

RenderWorld Space Debug Lineskotlin

import top.katton.api.*

@ClientScriptEntrypoint(ClientPhase.JOINED)
fun worldRenderTestMain() {
    registerWorldRenderer("katton:test:world", WorldRenderLayer.NORMAL, 0) { ctx ->
        val pos = clientPos() ?: return@registerWorldRenderer

        val x = pos.x
        val y = pos.y + 1.6
        val z = pos.z

        // X axis — red
...

Script Packs

Organize Kotlin and Java sources into local or world-specific packs with manifests, state files, and optional client sync.

Platform Aware

Use Fabric and NeoForge for full client/mod features, or Paper for server-only Bukkit scripting and Folia-aware scheduling.

Hot Reload

Reload events, registries, injections, rendering hooks, and datapack mutations without restarting your workflow.