FailureToLog api
by kooyoseb
FailureToLog API is a Fabric companion for the FailureToLog Paper server plugin, so the client can send disconnect details to a server that runs it.
What it does
When a player joins a server, the mod checks through a custom plugin message handshake whether that server runs the FailureToLog plugin. It reads the reason shown on Minecraft's disconnect screen and can pass those details to the server. Two timing modes control when the report leaves the client. The recommended mode waits for the next connection, since a client cannot send data after the network connection has closed.
Reports are stored locally and sent later, once the player joins the same FailureToLog-enabled server, and the file is deleted after the server has received it. Staff can then read the reports through the plugin's log viewer. Without the Paper plugin on the server, the mod sends nothing. The mod is licensed under CC0 1.0 Universal and is open source. It is published for Fabric only, across game versions 26.1 – 26.2, and its latest file targets 26.2.
Key features
Server detection
A handshake over custom plugin message channels tells the mod whether the connected server runs FailureToLog.
Disconnect reason capture
The mod reads the title shown on the disconnect screen so the reason can be included in a report.
Immediate or next-connection sending
Reports can be sent right after disconnect, or saved and sent on the next connection to the same server.
Mod Menu settings
A config screen in Mod Menu lets players change the send timing and shows a warning about the options.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Server troubleshooting
Staff on a FailureToLog server can see why a player was disconnected, as the client reports the screen reason.
Who it’s for: Server owners who run the FailureToLog Paper plugin and players who join those servers with Fabric.
How it compares
JRSecurity is a Fabric mod for 1.20.5 – 26.2 under All rights reserved and is not open source. AutoDisconnect is a Fabric mod for 1.21.11 that works on either side, and neither side needs it, under All rights reserved, and it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| FailureToLog api | Fabric | 26.1 – 26.2 | Client or server, optional | 2026-07-04 |
| JRSecurity | Fabric | 1.20.5 – 26.2 | Not published | 2026-04-04 |
| AutoDisconnect | Fabric | 1.21.11 | Client or server, optional | 2026-08-08 |
Questions
Does FailureToLog API need the Paper plugin on the server?
Why does a disconnect report wait for the next connection?
Which Fabric versions does FailureToLog API support?
In the catalog
FailureToLog api is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 13,894 mods support Minecraft 26.2.
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What the author says
FailureToLog API Fabric is a client-side companion mod for the FailureToLog Paper server plugin. It helps FailureToLog servers receive more useful client-side disconnect information. When a player disconnects or sees an error screen, the mod can save the screen reason and send it to a compatible server so staff can…
Official listing
- Modrinth page
- modrinth.com/mod/failure-to-log-api-fabric
- Owner
- kooyoseb
- Published
- 2026-05-14
- Updated on Modrinth
- 2026-07-04
- Facts verified
- 2026-10-15