Mojang Dev Tools
by johnseth97
Mojang Dev Tools, a Fabric mod for 26.1.2, switches on developer debug overlays and hidden features that Mojang normally keeps inside its own IDE.
What it does
Players and mod developers use the mod to enable developer features that are normally only available inside Mojang's IDE. Each feature can be toggled from the in-game config menu, and the F3 + F6 shortcut turns the overlays on and off during play. The mod enables flags in officially released Mojang binaries, so no separate build is needed.
The overlays draw pathfinding routes, block neighbor updates, structure bounding boxes, mob brain memory, AI goal selectors and point of interest markers over the world. Together they show how mobs choose goals and paths, and how the world reacts to block changes, which suits people trying to understand the game's internals. The source code and issue tracker are public, and the project is open source under the GNU General Public License v3.0 or later.
The mod is published only for Fabric Loader 0.19.2 and later, and only for Minecraft 26.1.2. Its latest Fabric file is 1.1.5, released on 2026-05-29.
Key features
Pathfinding route overlay
Draws the routes mobs calculate, so their movement choices can be followed in the world.
Mob brain and goal overlays
Shows the memory a mob's brain holds and which AI goals its selector has chosen.
Block and structure overlays
Displays block neighbor updates and structure bounding boxes to show how changes spread and where structures sit.
Point of interest overlay
Marks points of interest, such as the places villagers use, so their locations are visible.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Mod developers and curious players who want to see what happens inside the game. Players who only play survival normally do not need these overlays.
How it compares
ToolDurabilityHUD is a client-side only Fabric mod for 26.2, released under the MIT License. Light Overlay is a client-side only Fabric mod for 1.21.6 – 26.3, licensed under Creative Commons Attribution Non Commercial Share Alike 4.0 and not open source. Mojang Dev Tools covers only 26.1.2 and is open source under the GNU General Public License v3.0 or later, so it covers developer overlays rather than HUD or lighting display.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Mojang Dev Tools | Fabric | 26.1.2 | Not published | 2026-05-29 |
| ToolDurabilityHUD | Fabric | 26.2 | Client-side only | 2026-09-15 |
| Light Overlay | Fabric | 1.21.6 – 26.3 | Client-side only | 2026-10-02 |
Questions
Does Mojang Dev Tools need Fabric API?
Does the mod have to be installed on the server?
Which game version does Mojang Dev Tools support?
In the catalog
Mojang Dev Tools is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 15,189 mods support Minecraft 26.1.2.
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What the author says
Unlocks all hidden developer features normally only available inside Mojang's IDE — with an in-game config menu to toggle each flag individually. ALL TOOLS EXIST IN OFFICIALLY RELEASED MOJANG BINARIES, THIS MOD SIMPLY ENABLES THE FLAGS
Official listing
- Modrinth page
- modrinth.com/mod/mojangdevtools
- Owner
- johnseth97
- Published
- 2026-05-26
- Updated on Modrinth
- 2026-05-29
- Facts verified
- 2026-10-15