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Crate
tower
Modular and composable network service middleware for Rust.
What it is
tower defines the Service trait — a single async fn(Request) -> Response — and provides middleware that wraps services: rate limiting, timeouts, retries, load balancing, and buffering. It is the middleware abstraction layer used by axum, tonic, and hyper.
Why it is commonly used
The backbone of the Rust HTTP and gRPC middleware ecosystem. Application developers use it indirectly through axum and tonic. Library authors implement Service to write reusable middleware that works across any tower-compatible framework.
691
Repositories
90%
Actively maintained
620
Updated ≤ 30 days
2.3M
Total stars
631
Owners
Counted from the Cargo.toml manifests of the 691 indexed repositories that declare tower as a dependency — not download counts. Dependency data last verified 2026-09-16.
Often used with
Crates that show up unusually often in tower 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 tower projects that also use it.
axum-extra18.4%tonic-prost-build10.6%tonic-prost17.2%tower-http75%metrics-exporter-prometheus11.7%http-body14.2%governor11.1%prost-types17.1%tonic32.9%utoipa16.9%opentelemetry-otlp28.7%axum-server11%jsonwebtoken27.6%tracing-opentelemetry23.7%moka16.4%opentelemetry_sdk29.4%metrics14.8%opentelemetry31.1%mockall11.9%hyper-util34.6%http-body-util35.2%axum83.4%aws-sdk-s310.6%prometheus19%
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