Entity Debugger
by driver166
Entity Debugger lets players and developers view and edit the NBT data of living entities in-game, through a right-click interface, without leaving the world.
What it does
Right-clicking an entity opens a GUI that shows its NBT data, and changes made there take effect in the running game. Critical tags such as position, rotation and health are applied immediately, so edits can be tested as they happen. Developers can use it to debug entity data, test NBT structures, check that synchronization logic behaves as expected and study how entity data is organized.
Values are shown with colors that mark their NBT type, and boolean fields use a dropdown for true and false. Long lists open in a multi-line editor with syntax highlighting. Large data sets are split into pages, new tags can be added, and several modifications can be saved in one batch. Input is validated, and invalid changes are rejected with an error prompt.
The mod runs on Fabric for Minecraft 1.20.1 only, with a single file, 1.1.1, first published on 2025-08-19 and last updated on 2025-08-23. It is client-side only, so the server does not need it, and it is released under the GNU General Public License v3.0 only, which makes it open source. The source code is public.
Key features
Real-time NBT editing
Entity NBT data can be changed directly in-game, and the changes are synchronized with the running world.
Colored type highlighting
Each NBT value type is drawn in its own color, which makes the data easier to read at a glance.
Boolean dropdown
Boolean values are set from a dropdown that offers true and false, so no typing is needed.
Multi-line list editor
Lists open in a dedicated editor with syntax highlighting, for values that span several lines.
Special tag synchronization
Position, rotation, health and other critical tags take effect immediately after an edit.
Batch saving and pagination
New tags can be added and many changes saved together, while large NBT data is browsed page by page.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Entity NBT Viewer, Copy NBT and Easy NBT Editor are client-side Fabric mods for different version ranges, and none of them is open source. Entity NBT Viewer covers 1.20 – 1.20.2 and is released under the MIT License, while Copy NBT covers 1.20 – 1.20.4 under the same license. Easy NBT Editor targets 1.20.5 – 1.21.8 under All rights reserved. HexNBT is the only alternative that also targets 1.20.1 and is open source, but it runs on client and server and is released under CC0 1.0 Universal.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Entity Debugger | Fabric | 1.20.1 | Client-side only | 2025-08-23 |
| Entity NBT Viewer | Fabric | 1.20 – 1.20.2 | Client-side only | 2024-06-14 |
| Copy NBT | Fabric | 1.20 – 1.20.4 | Client-side only | 2025-06-26 |
| Easy NBT Editor | Fabric | 1.20.5 – 1.21.8 | Client-side only | 2025-12-21 |
| HexNBT | Fabric | 1.20.1 | Client and server | 2026-03-30 |
Questions
Does Entity Debugger need to be installed on the server?
Which Minecraft version does Entity Debugger support?
Is Entity Debugger open source?
In the catalog
Entity Debugger is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 34,764 mods support Minecraft 1.20.1.
More from driver166
Similar mods
What the author says
Entity Debugger is a powerful Minecraft Fabric mod that provides an intuitive entity NBT data editing interface for players and developers. With a simple right-click, you can view and modify any entity's NBT data with real-time synchronization to the game world. For mod developers, this tool can: - Quickly debug…
Official listing
- Modrinth page
- modrinth.com/mod/entity-debugger
- Owner
- driver166
- Published
- 2025-08-19
- Updated on Modrinth
- 2025-08-23
- Facts verified
- 2026-10-15