RJ's Session Stats

Writes per play session statistics files alongside the vanilla (global) ones, in the same format.

50 Downloads

fabricutility

Rent Server with this Mod

About this Mod

RJ's Session Stats

Fabric server mod that writes per-session stat deltas when players disconnect.

In addition to the vanilla statistics files, you get a per session (between join/leave) file
for each player.

What it does

Captures a stat snapshot on join and computes deltas on disconnect.
Writes a JSON file per session under: world/stats/sessions/YYYY-MM-DD/.
File names include start/end timestamps, player UUID, and player name.

Output format

Uses the vanilla stats JSON format, but values are deltas for the session.

Example file listing (one player)

$ find server-data/world/stats/

server-data2/world/stats/
server-data2/world/stats/5b2b1d3d-0d25-4086-bd3f-27328f30467c.json
server-data2/world/stats/sessions
server-data2/world/stats/sessions/2026-01-17
server-data2/world/stats/sessions/2026-01-17/2026-01-17T19-29-40Z_2026-01-17T19-48-56Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T19-52-36Z_2026-01-17T19-55-20Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T19-58-08Z_2026-01-17T19-58-33Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T20-02-52Z_2026-01-17T20-02-57Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-17/2026-01-17T20-05-59Z_2026-01-17T20-06-08Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19
server-data2/world/stats/sessions/2026-01-19/2026-01-19T14-20-36Z_2026-01-19T14-20-58Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19/2026-01-19T14-31-19Z_2026-01-19T16-03-47Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19/2026-01-19T16-04-43Z_2026-01-19T19-46-16Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
server-data2/world/stats/sessions/2026-01-19/2026-01-19T19-46-27Z_2026-01-19T23-16-04Z__5b2b1d3d-0d25-4086-bd3f-27328f30467c__RJ_1982.json
...

Available Versions

RJ's Session Stats 1.0.1release

MC 1.21.11fabric

March 3, 2026

RJ's Session Stats 1.0.0release

MC 1.21.11fabric

January 22, 2026

How to Install RJ's Session Stats on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

Install Mod

Open the mod browser in the dashboard and search for "RJ's Session Stats". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

RJ's Session Stats server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is RJ's Session Stats compatible with fabric?

RJ's Session Stats officially supports fabric for Minecraft 1.21.11. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with RJ's Session Stats – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if RJ's Session Stats consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.