Developer Tools
Ever wondered what lies beneath the surface of your Minecraft world? The Developer Tools mod transforms your game into a live debugging environment, giving you instant access to the data that drives every block, fluid, item, and entity around you. Designed for Fabric, this client-side add-on is safe for multiplayer servers and works across a wide range of Minecraft versions, from the classic 1.14 releases all the way up to the latest 1.21.x updates. Whether you're a map maker, a modpack creator, or simply a curious player, Developer Tools puts a wealth of information right at your fingertips.
What Makes Developer Tools Stand Out
At its core, Developer Tools for Minecraft is a client-side Fabric mod that adds a dedicated Inspect mode. When activated, your movement freezes and your cursor unlocks, allowing you to point at any block, fluid, dropped item, or creature to read detailed debug-style data directly on screen. The mod supports Minecraft versions from 1.14 through 1.21.x, including all major snapshots, and requires Fabric Loader 0.18.6 or newer along with the Fabric API. Because it runs entirely on the client, you can safely keep it in your mods folder even when joining vanilla servers.
How to Install Developer Tools
Getting started with Developer Tools is straightforward. First, ensure you have the Fabric Loader installed for your chosen Minecraft version. Next, download Developer Tools and the latest Fabric API from their official sources. Place both JAR files into your mods folder, launch the game, and you're ready to go. Once in a world, press F6 (the default keybind) to toggle Inspect mode. You can then hover over any block or entity and left-click to lock your selection. For a deeper dive, press M to expand a full NBT data dump. If you ever need to tweak the controls, head to the vanilla Key Bindings menu—every action is remappable.
Inspect Mode: A Closer Look
When you activate Inspect mode, the mod adjusts your game interactions to prioritize data gathering. Your character stands still, preventing accidental movement, while the cursor unlocks so you can freely point at targets. Left-clicking no longer punches or attacks; instead, it selects the hovered block or entity. A thin outline highlights what you're pointing at, and a thicker, brighter outline confirms your selection. You can even scroll through long text panels using the mouse wheel. For those moments when you need to move around while keeping the HUD visible, hold the Left Alt key to temporarily regain movement and camera control—the raycasting freezes, and the overlay becomes transparent.
Rich Data at Your Fingertips
The HUD is the heart of Developer Tools. It displays a header with the target's icon, display name, and registry ID, all color-coded to match vanilla rarity tiers. A summary section provides quick facts like coordinates, health for living entities, or drop information. Pressing M opens a categorized detailed view covering everything from block state properties and block entity NBT to entity equipment, active effects, and raw NBT. Boolean values are styled distinctly for fast scanning, and you can copy any line to your clipboard by holding Left Ctrl and clicking it—a brief "copied" message confirms the action.
Customizing Your Experience
Developer Tools offers deep customization through its in-game settings menu, accessible via Options → DevTools… (located under the FOV slider). The menu is split into three screens: Colours, Preferences, and Layout. In the Colours screen, you can override nearly every HUD color—from the background and text to scrollbar elements—using a built-in color picker with hue, saturation, and brightness sliders. The Preferences screen lets you toggle individual data lines on or off, with a master "All Preferences" switch for quick resets. The Layout screen controls the HUD's corner position and the order of categories in the detailed view. All changes are saved to a devtools.properties file in your config folder, making it easy to share or back up your setup.
If you want a seamless way to keep your mods organized, the foxygame.net launcher includes Developer Tools in its extensive add-on catalog, allowing you to install it with a single click while automatically resolving Fabric API dependencies and ensuring version compatibility.
Keybinds and Hidden Tricks
Beyond the basics, several key combinations enhance your workflow. Holding Left Alt temporarily frees your player while keeping Inspect mode active—perfect for repositioning. Opening any fullscreen menu (like the pause or inventory screen) suspends raycasting, so you won't accidentally lose your selection. The mod also respects vanilla rarity colors for items, and the HUD's boolean styling makes true/false values instantly recognizable. All keybinds are listed under Controls → DevTools and display your current bindings in the HUD itself.
Why Every Technical Player Needs Developer Tools
Whether you're debugging a redstone contraption, verifying block properties for a custom map, or simply satisfying your curiosity about entity NBT, Developer Tools for Minecraft is an indispensable utility. Its lightweight, client-only design means zero server-side impact, and the extensive configuration options let you tailor the HUD to show exactly what you need. The mod's support for Minecraft versions 1.14 through 1.21.x ensures it fits into almost any modded or vanilla playthrough. So go ahead, download Developer Tools, press F6, and start exploring the hidden layers of your world.