Data Dumper: Registry Browser and JSON Export Mod for Minecraft

Data Dumper

Datapack development in Minecraft can feel like detective work. You need to know exactly what is inside a registry, which tags exist, and why a pack refuses to load. Data Dumper is a mod built to answer those questions without ever leaving the game. It is a focused utility that helps datapack developers browse and export registry data quickly, and it quietly saves you from a lot of guesswork.

What Data Dumper Does

At its core, Data Dumper exposes the game's registries through simple commands. Instead of digging through jar files or external references, you can list every registry, open one, and inspect its entries in chat. The mod supports tag and regex filtering, so you can narrow a huge list down to exactly what you need. When you find something useful, you can export registry entries as JSON files for debugging or documentation.

There is a second, more subtle benefit. Data Dumper prevents crashes when you create a world with invalid datapacks. That means you can keep a broken pack loaded, inspect what failed to parse, and fix the problem in place rather than removing files one by one.

Key Features at a Glance

• List all registries available in the game
• Filter registry contents by tag or regex
• Export registry entries as JSON files
• Export datapack entries that failed to parse
• Prevent crashes when creating a world with invalid datapacks
• Click chat messages to copy all entries at once

The copy-on-click behavior is a small touch that matters more than it sounds. Once a filtered list is in chat, a single click puts the whole thing on your clipboard for use in a script, a config file, or a bug report.

Commands and Workflow

Everything runs through the /datadumper command tree. The syntax is consistent, so once you learn one branch you can guess the rest.

Browsing Registries

• /datadumper registries — list all registries
• /datadumper registry <key> — view all entries in a registry
• /datadumper registry <key> #<tag> — filter entries by tag
• /datadumper registry <key> "<regex>" — filter entries by regex

A practical example: searching for all blocks containing "planks" returns the full family in one pass, while querying a tag such as a common chest tag shows exactly which entries are grouped together. This is invaluable when you are writing recipes, loot tables, or advancement conditions and need to confirm an ID before committing to it.

Exporting Data

• /datadumper entry <key> — export registry entries as JSON files
• /datadumper entry <key> #<tag> — filter and export by tag
• /datadumper entry <key> "<regex>" — filter and export by regex

Exported files land in a .datadumper/ folder inside the server's working directory. From there you can diff versions, feed the JSON into tooling, or attach it to a report. If a datapack fails to parse, Data Dumper writes out those broken entries too, which turns a vague loading error into a concrete list of problems.

Supported Versions and Loaders

Data Dumper is available across the modern modding landscape. On Minecraft 1.20.1 it runs on Fabric and Forge. On 1.21.1 it supports Fabric and NeoForge. The 26.1 release supports Fabric and NeoForge as well. If you maintain packs across several versions, this consistency keeps your debugging routine identical no matter which profile you launch.

Installation follows the standard mod workflow. Install the matching loader for your game version, drop the mod file into your mods folder, and launch. If you would rather skip manual file handling, the foxygame.net launcher can add Data Dumper to a compatible instance in a single click, pulling the correct build for your selected Minecraft version automatically. That is genuinely handy when you are switching between a 1.20.1 test world and a 1.21.1 project in the same afternoon.

How to Install Data Dumper

1. Confirm your Minecraft version and loader.
2. Download Data Dumper for that exact combination.
3. Place the file in your mods folder.
4. Launch the game and run /datadumper registries to verify it loaded.

For server-side debugging, remember that the export folder is relative to the server's working directory, not the client. On a dedicated server that is usually the folder containing the server jar.

Who Should Use It

Data Dumper is aimed squarely at datapack developers, modpack authors, and server administrators who spend time tracing IDs and tags. It is not a gameplay mod and it does not change world generation or mechanics. Its value is purely in visibility: you see what the game sees, and you can prove it with exported JSON.

If you also ship modpacks, the companion practice of using mod sets to disable development tools before publishing pairs well with this workflow. Keep Data Dumper enabled while you build, then switch it off for release.

Final Thoughts

Debugging datapacks is faster when the answers are one command away. Data Dumper turns registry inspection, tag filtering, regex search, and JSON export into a single in-game tool, and its crash protection means a broken pack no longer blocks you from finding the fault. Whether you are checking a block ID or auditing an entire registry, this mod earns a permanent slot in your development setup.