Crate

log

Lightweight logging facade for Rust — the log! macros.

What it is

log is the historic standard logging interface in Rust. It defines the info!, warn!, error!, debug!, and trace! macros and a Log trait for implementors. Actual output is handled by a backend crate — env_logger, tracing-log, or simplelog — initialized once at startup.

Why it is commonly used

Widely used in libraries that need to emit diagnostics without depending on a specific logging implementation. Application code picks the backend; library code uses the log macros and lets the application route output as needed.

1.7k
Repositories
85%
Actively maintained
1.5k
Updated ≤ 30 days
4.9M
Total stars
1.4k
Owners

Counted from the Cargo.toml manifests of the 1.7k indexed repositories that declare log as a dependency — not download counts. Dependency data last verified 2026-08-13.

Browse 1730 repositories using log in Repos →
Often used with

Crates that show up unusually often in log projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of log projects that also use it.

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