Java developer tools

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

A number of debug tools are available during normal gameplay:

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

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 debug properties)

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

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

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.​^{[more information 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 game rules.^[1]

In Java Edition 26.2, the button was moved to right of the Singleplayer button and the label was changed to "TW".

👁 Image

👁 Image

Superflat Preset

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

Game rules

advance_time

false

spawn_mobs

false

advance_weather

false

The GameTest feature contains a hidden functionality that allows users to export data to an SNBT file.^[2]​^{[more information needed]}

Sub-commands

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

• /test export

• /test exportclosest

• /test exportthese

• /test exportthat

👁 Image

Test Instance Blocks

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

👁 Image

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

👁 Image

👁 Image

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

v t e Java Edition technical
General Concepts 👁 Image Block entity 👁 Image Coordinates 👁 Image Crashes [String] Loot context 👁 Image Mob AI 👁 Image Point of Interest 👁 File directory.png: Sprite image for directory in Minecraft Identifier 👁 Image Screenshot 👁 Image Statistics 👁 Image Telemetry 👁 Image Tick 👁 Image Random Tick 👁 Image UUID 👁 Image JSON General format 👁 Image Data values 👁 Image Classic Remake 👁 Image Indev 👁 Image Pre-flattening 👁 Image Data component format 👁 Image Predicate 👁 Image Entity format 👁 Image Block entity format 👁 Image Map item format [NBT Compound / JSON Object] NBT format 👁 Image Particle format 👁 Image Text component format § Formatting codes 👁 Image Key codes 👁 Image Random sequence 👁 Image Structure file format 👁 Image Schematic file format World 👁 Image Heightmap 👁 Image Seed Anomalous 👁 Image Data version Legacy 👁 Image Spawn chunk Level format 👁 Image Anvil file format 👁 Image Chunk format 👁 Image Player format 👁 Image Point of Interest format 👁 Image raids.dat format 👁 Image Command storage format 👁 Image Scoreboard format Legacy 👁 Image Classic level format Classic server protocol 👁 Image Indev level format 👁 Image Alpha level format 👁 Image Zone file format 👁 Image Region file format 👁 Image server_level.dat format 👁 Image villages.dat format 👁 Image Generated structures format .minecraft 👁 File archive.png: Sprite image for archive in Minecraft client.jar 👁 Image version.json 👁 Image client.json 👁 Image command_history.txt 👁 Image launcher_profiles.json 👁 Image options.txt 👁 Image version_manifest.json 👁 Image hotbar.nbt format 👁 Image Server list format Tools Debug screen hotkey renderer 👁 Image 👁 Image GameTest DataFixerUpper 👁 Image Debug properties Legacy 👁 Image Obfuscation map Sound 👁 Image Block sound type 👁 Image Closed captions 👁 Image sounds.json Commands Brigadier 👁 Image Functions All commands Launching Mojang API 👁 Image Microsoft authentication 👁 Image Quick Play Legacy Legacy Minecraft authentication Yggdrasil Protocol 👁 Image Protocol version 👁 Image Packets Data types 👁 Image Encryption Server 👁 File archive.png: Sprite image for archive in Minecraft server.jar 👁 Image server.properties 👁 Image Server requirements 👁 Image Whitelist Operator list 👁 Image Code of conduct Protocols Query RCON Server Management Protocol Legacy al_version 👁 Image Item format
Data pack Components pack.mcmeta 👁 Image Pack format 👁 Image Advancements 👁 Image Functions 👁 Image Item modifier 👁 Image Loot tables 👁 Image Predicate 👁 Image Recipe 👁 Image Damage type 👁 Image Chat type 👁 Image Enchantment 👁 Image Enchantment provider 👁 Image Painting variant 👁 Image Banner pattern 👁 Image Instrument 👁 Image Jukebox song 👁 Image Trial spawner configuration 👁 Image Mob variants 👁 Image Dialog 👁 Image Armor trim 👁 Image Slot sources 👁 Image Timeline 👁 Image Villager trade Trade set World clock 👁 Image Sulfur cube archetype Tag 👁 Image Block 👁 Image Item 👁 Image Function 👁 Image Fluid 👁 Image Entity type 👁 Image Game event 👁 Image Biome 👁 Image Flat level generator preset 👁 Image World preset 👁 Image Structure 👁 Image Point of interest type 👁 Image Painting variant 👁 Image Banner pattern 👁 Image Instrument 👁 ❤️ Damage type 👁 Image Enchantment 👁 Image Dialog 👁 Image Timeline 👁 Image Potion 👁 Image Villager trade 👁 Image Configured feature GameTest 👁 Image Test environment 👁 Image Test instance World generation Dimension 👁 Image Dimension type 👁 Image World preset 👁 Image Biomes 👁 Image Carver 👁 Image Configured feature 👁 Image Tree 👁 Image Placed feature Environment attribute Noise settings 👁 Image Noise router 👁 Image Density function Noises 👁 Image Surface rule Structures 👁 Image Structure set 👁 Image Template pool 👁 Image Processor list 👁 Image Structure templates Removed 👁 Image Configured surface builder Data packs 👁 Image Caves & Cliffs Prototype Data Pack 👁 Image Phantom Frames Tutorials 👁 Image Importing 👁 Image Creating Optimizing 👁 Image Command blocks and functions Repairing a world corrupted by a data pack Content 👁 Image Custom enchantments 👁 Image Custom paintings 👁 Image Custom trims World generation 👁 Image New dimension 👁 Image Custom structures
Resource pack Components pack.mcmeta 👁 Image Pack format 👁 Image Language 👁 Image Models 👁 Image Blockstates 👁 Image Items 👁 Image Sounds (sounds.json) Shaders 👁 Image Textures 👁 Image Atlases Aa Fonts 👁 Image Colormaps 👁 File file.png: Sprite image for file in Minecraft Texts 👁 Image Waypoint styles regional_compliancies.json 👁 Image Equipment Debug Missing font character 👁 Image Missing model 👁 Image Missing texture Tools Slicer Legacy Texture Ender Unstitcher Tutorials 👁 Image Creating 👁 Image Loading 👁 Image Models 👁 Image Sound directory

Retrieved from "https://minecraft.wiki/w/Java_developer_tools?oldid=3640849"