DevTools

DevTools is a client-side Fabric mod for Minecraft 1.14.4 through 26.3 that adds a powerful Inspect mode to your game. By freezing your movement and unlocking your cursor, you can point at blocks, fluids, dropped items, and entities to read rich, debug-style data directly on your screen.

It features customizable layouts, deep NBT-style data dumps, a registry browser (blocks, biomes, structures and entities), side-by-side Compare mode, biome coverage estimates, and clipboard copying.

Requirements & Versioning

Quick Start

1. Install Fabric, then drop DevTools and the matching Fabric API into your mods folder.
2. Launch the game and enter a world.
3. Press F6 (default) to toggle Inspect mode.
4. Move your mouse over blocks or creatures, and Left-Click to select them.
5. Press M to expand detailed data for your selected target, or click the ↗ Expand bar at the bottom of the HUD.
6. Type into the Search field to browse blocks, biomes, structures and entities.
7. Head to Options -> DevTools… to tweak colours, toggle data lines, or change the layout.

How Inspect Mode Works

When you turn Inspect mode on, the game adjusts your interactions so you can focus on the environment data.

Keybinds

All keys can be remapped under Controls -> DevTools. The info panel always displays the actual names of the keys you have currently bound.

Free Camera (Alt Mode)

If you hold Left Alt, you temporarily get your movement and camera controls back. Raycast updates are frozen, so the outlines stay fixed to your last targets, and the HUD becomes transparent so you can see the world.

Menu Suspensions

Opening any fullscreen menu (for example the Pause or Inventory screen) suspends and freezes raycasting and its updates, so you won't mess up your selection.

The Info Panel (HUD)

The HUD is designed to provide immediate summary data, with the option to expand into detailed categories.

• Header: Shows if you are HOVERING or have a target SELECTED. Includes the icon of the selected block/entity, display name, and registry ID. Rarity colours automatically match vanilla Minecraft tiers (common, uncommon, rare, epic).
• Summary: Quick facts like coordinates, HP for living entities, or drop info for items.
• Search: Filters the visible lines/targets without leaving the world.
• Expand window Button: The ↗ Expand window button at the bottom opens the full-screen detail window for the selected (or hovered) target.
• Detailed Info ("More Info"): Hitting M opens a categorized text dump. Default category order: Source, Item Form, State Properties, Block Data, BlockEntity, Environment, Type, Identity, State, Living, Equipment, Effects, Mob, Raw NBT.
• Biome coverage: Biome details include an Estimated coverage line (see below).
• Boolean Styling: true / false lines are coloured distinctly for quick scanning.
• Copy Feedback: Successfully copying a line flashes a quick "copied" message.

Registry Browser

The search box covers four categories:

Results are grouped under collapsible category headers with a match count. Matching is case-insensitive against both the registry ID and the display name; _, / and spaces count as word boundaries, multi-word queries require every word to match, and also one typo is tolerated for words of four or more characters (acient -> ancient). Click an entry to open its detail window. The detail window's own search field filters the displayed attributes; the compare window has a separate block search.

Biome Coverage

The result is specific to the current world seed.

Detail & Compare Windows

• Detail window — the full dump for one target, with an attribute search field, scrolling and line copying.
• Compare window — opened with Ctrl+C. It has its own block search list; pick a block to view a side-by-side attribute comparison against the selected target.

Settings Menu

Options -> DevTools… opens the settings menu. The button is placed under the FOV slider, in the middle.

License

DevTools is released under the MIT License.