Empowering everyone to build reliable and efficient software.
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Crate
env_logger
Logger backend for the log crate, configured via RUST_LOG.
What it is
env_logger is the simplest logging backend for the log facade. It reads RUST_LOG to configure per-module log levels, then writes formatted output to stderr. Initialization is a single env_logger::init() call at program startup.
Why it is commonly used
The default logger in Rust CLI tools and test suites. Zero configuration in code, runtime-controllable with RUST_LOG=debug or RUST_LOG=myapp=trace, and requiring no setup beyond one line in main().
834
Repositories
86%
Actively maintained
712
Updated ≤ 30 days
2.3M
Total stars
701
Owners
Counted from the Cargo.toml manifests of the 834 indexed repositories that declare env_logger as a dependency — not download counts. Dependency data last verified 2026-08-13.
Often used with
Crates that show up unusually often in env_logger 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 env_logger projects that also use it.
log94.2%wasm-bindgen-futures12.8%strum_macros10.1%web-sys12.6%crossbeam-channel11.4%lazy_static22.5%cfg-if11.4%num_cpus10.6%bytemuck12.4%num-traits16.1%itertools29.3%byteorder11.2%nix17.3%strum21.5%console_error_panic_hook10.2%bincode14.5%bitflags18.1%serde_with11.4%js-sys12.1%paste10.3%once_cell24.8%smallvec17%indexmap22.5%rayon26.9%
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