ModsJava
Packet Spy
PacketSpy is a network debugging tool for Minecraft. It intercepts and logs packets sent (TX) and received (RX) by the client. It features a local web…
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
PacketSpy V2.0
This is a mod made to debug packets and log packets being sent and received by the client. It will host a website using Java WebSockets and host it on localhost:8887. It is not fully working now. For example, it says field_xxxx, where xxxx is numbers. I need to fix that ASAP, but yea, it's just a small mod to look at packets.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.4, 1.21.5
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as PacketSpy-2.0.jar — drop this file into the mods folder
- Download size: 147 KB
- Download link checked 8 Sept 2026 — working
These come from our own check of the pack file, not from the source page.