BlameLog
With BlameLog, a method that logs a message can prepend the name of its caller, class or method to the line, so the origin of each entry is visible at a glance.
What it does
BlameLog is a Fabric utility that patches the Logger so that messages written by a method carry information about the code that called it. The output can include the full class name, the simple class name with the package left off, the method name, the method parameters and the method return type. Each part is a separate option, so a log line can show as much or as little of its origin as the reader needs.
The mod is a proof-of-concept that patches Loggers to prepend method callers, and it is useful when tracing which code path produced a given message. It is open source under the MIT License and is published for Fabric only, across 17 release versions covering 1.18 – 1.21.1. Dark Matter is bundled inside the mod, so no separate install is needed for it. Either side can run it, and neither needs it.
Key features
Caller prefix on log lines
Log messages written through the Logger get a prefix naming the method that called them.
Full or simple class names
The prefix can use the full class name or the simple name, and the package can be dropped from the output.
Method name and parameters
Options add the method name, its parameter list and its return type to each prefix.
Bundled Dark Matter
The Dark Matter library ships inside the mod, so the Fabric build works without installing it separately.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x2 of 2 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Embedded 1
Use cases
Tracing log origins
Developers can see which class and method wrote a line without adding extra logging by hand.
Who it’s for: Mod developers and people debugging a Fabric setup who read the game log often want to see which class and method wrote each line, and the prefix options let them choose how much of that origin appears in the output.
How it compares
Client Data Command is client-side only, open source under the MIT License and published for Fabric for 1.21 – 1.21.5, so it adds commands on a client and nothing on a server. Packet Logger is also client-side only and open source under the MIT License, but its Fabric files cover 1.16.2 – 1.18.2, a range that ends before the versions BlameLog targets. Here 'n' There runs on Fabric and NeoForge for 1.21 – 26.3 under the Apache License 2.0, and its environment is client-side only too.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| BlameLog | Fabric | 1.18 – 1.21.1 | Client or server, optional | 2024-08-02 |
| Client Data Command | Fabric | 1.21 – 1.21.5 | Client-side only | 2024-08-20 |
| Packet Logger | Fabric | 1.16.2 – 1.18.2 | Client-side only | 2024-01-15 |
| Here 'n' There | Fabric and NeoForge | 1.21 – 26.3 | Client-side only | 2026-09-15 |
Questions
Does BlameLog need to be installed on a server?
Which loader does BlameLog support?
Is Dark Matter needed alongside BlameLog?
In the catalog
BlameLog is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 32,366 mods support Minecraft 1.21.1.
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Similar mods
What the author says
This is a proof-of-concept mod, which patches Loggers to prepend method callers. This mod offers additional configuration via config/blamelog-pattern.txt, where you can set the pattern for the logger. Default is [{simpleClass}#{method}] {message}
Official listing
- Modrinth page
- modrinth.com/mod/blame-log
- Owner
- constellation
- Published
- 2023-04-15
- Updated on Modrinth
- 2024-08-02
- Facts verified
- 2026-10-15