MMDR - Minecraft Mod Development Runtime

Stop wasting time waiting for restarts. Start coding at the speed of thought.

MMDR eliminates the painful edit-compile-restart cycle by providing hot reload capabilities, an interactive debug console, visual inspection tools, and automatic test generation.

Get Started → View on GitHub →

🔥 Hot Reload System

Modify Java code and see changes instantly without restarting Minecraft. Save hours every day with intelligent class reloading and state preservation.

💻 Interactive Debug Console

Execute Java/Groovy code directly in-game with full access to Minecraft internals. REPL environment with command history and auto-completion.

🔍 Visual Inspector

Inspect blocks, entities, NBT data, and network packets in real-time with a beautiful overlay. Three modes: Basic, Detailed, and Advanced.

🧪 Automatic Test Generator

Record your gameplay and automatically generate JUnit tests. Export as JUnit, TestNG, or Cucumber features. Testing has never been easier.

📊 Performance Impact

MMDR is designed to be lightweight and efficient:

Feature	Performance Impact
Hot Reload	~1-2% CPU overhead
Console	0% when closed
Inspector	~0.5 FPS drop
Test Recording	~1-2% overhead

🚀 Quick Example

// 1. Make a change to your mod
public String getMessage() {
    return "Hello from hot reload!"; // ✨ Change this
}

// 2. Save the file (Ctrl+S)
// 3. See changes instantly in-game!

Press ` in-game to open the debug console:

// Teleport instantly
mc.player.setPosition(0, 100, 0)

// Give yourself items
mc.player.giveItemStack(new ItemStack(Items.DIAMOND, 64))

// Change time of day
mc.world.setTimeOfDay(6000)