Minecraft:Java developer tools

Developer tools are tools used by Minecraft:Mojang Studios developers to develop new features and debug glitches.

Accessible to players

A number of debug tools are available during normal gameplay:

• The Minecraft:debug screen is a screen that can be enabled using the Template:Key key. It shows various values useful for debugging the state of the game.
• Minecraft:Debug hotkeys are key-combinations that trigger or enable debugging features.
• Minecraft:Debug renderers are a set of graphical tools used for technical analysis of Minecraft.
• Minecraft:GameTests are a system used to systematically test gameplay features.

Accessible through debug properties

Template:Main Using special JVM properties (command line arguments when starting the game) many additional debug features can be enabled:

• Additional debugging commands
• Additional debug hotkey
• Additional debug renderers
• Many other debugging tools (see Minecraft:debug properties)

Accessible only through mods

Some features, while part of the code, can only be enabled using Minecraft:mods.

In most cases, mods can achieve this by overriding the IS_RUNNING_IN_IDE flag in the SharedConstants class.

Test Worlds

The "Create Test World" button on the title screen can be used to generate a superflat world that is designed to be used for testing.Template:More info needed The world is set to allow commands and uses Creative as the default gamemode. It also disables the generation of structures, and changes some Minecraft:game rules.<ref>Template:Ytl</ref>

File:Create test world.png

Superflat Preset

minecraft:bedrock,3*minecraft:stone,116*minecraft:sandstone;minecraft:desert

Game rules

advance_time

false

spawn_mobs

false

advance_weather

false

GameTest Exports

The GameTest feature contains a hidden functionality that allows users to export data to an SNBT file.<ref>Template:Ytl</ref>Template:More info needed

Sub-commands

The following sub-commands are available on both singleplayer and multiplayer:

• /test export

• /test exportclosest

• /test exportthese

• /test exportthat

Test Instance Blocks

If the functionality is enabled, the "Export Structure" option will appear in the GUI for the Test Instance Block.

File:Test instance block UI export.png

SNBT Files

Structure data that has been exported to an SNBT file is able to be loaded across different worlds. This can be done using a Structure Block or the "/place" command.

For example, to place a structure that has been exported to an SNBT file named "cookies", the following command can be used:

• /place template minecraft:minecraft/structure/cookies

Videos

In the video below, a YouTuber named EightSidedSquare showcased most of the developer tools before they were made available with debug properties.