Packet Ninja
by Orbitary
Packet Ninja is a Fabric utility that logs the network packets a client sends and receives, so developers can inspect them while debugging.
What it does
Packet Ninja lets its user customize how incoming and outgoing packets are logged. Packet Ninja is meant to ease packet debugging during mod development, letting developers see traffic between client and server without adding their own logging code. The author describes support for packets as a planned direction for later builds.
Only the client needs the mod, so a player can run it in single-player or on a server without the server installing anything. Packet Ninja is open source under the GNU Lesser General Public License v3.0 only, and its source code and issue tracker are public. Files are published for Fabric alone, for 1.21.8, 1.21.10 and 1.21.11, with 0.1.0 for 1.21.11 as the latest file, dated 2026-03-28.
Key features
Configurable packet logging
Logging of incoming and outgoing packets can be adjusted to show the traffic that matters for a given task.
Developer debugging
The logs are meant for mod developers who need to see packet flow while building and testing their code.
Full formatting essentials
The output carries the formatting details needed to read packet contents clearly in the log.
Planned packet support
The author lists further support for packets as a planned direction, so later releases may cover more of the traffic.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Debugging a mod's network code
A developer can watch the packets a mod sends and receives while testing a feature, instead of adding temporary print statements.
Checking traffic in a client
A modder can confirm which packets a client exchanges with a server during a session.
Who it’s for: Mod developers who want to inspect packet traffic during development. Players with no interest in network debugging have little use for the mod.
How it compares
Fabric Packet Logger is also a Fabric, client-side only, open source option under the MIT License, covering 1.21 – 26.2. Packet Shield is a Fabric mod for 1.21 – 1.21.11 under the MIT License, but it is not open source, so its code is not available. Packet Ninja is limited to the 1.21.8, 1.21.10 and 1.21.11 builds.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Packet Ninja | Fabric | 1.21.8 – 1.21.11 | Client-side only | 2026-03-28 |
| Fabric Packet Logger | Fabric | 1.21 – 26.2 | Client-side only | 2026-08-13 |
| Packet Shield | Fabric | 1.21 – 1.21.11 | Not published | 2025-12-14 |
Questions
Does Packet Ninja need Fabric API?
Does the server need Packet Ninja?
Which game versions does Packet Ninja support?
In the catalog
Packet Ninja is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
A utility mod used to customize logging for incoming and outgoing packets. The aim is to make working with packets, specifically during development, a little easier to debug!:)
Official listing
- Modrinth page
- modrinth.com/mod/packet-ninja
- Owner
- Orbitary
- Published
- 2025-10-26
- Updated on Modrinth
- 2026-03-28
- Facts verified
- 2026-10-15