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 hotkeys
• 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

File:Export subcommands.png

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 the "/place" command or a Structure Block.

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

File:Place template snbt.png

File:Snbt structure block.png

Videos

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