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.

690
Repositories
93%
Actively maintained
638
Updated ≤ 30 days
2.2M
Total stars
630
Owners

Counted from the Cargo.toml manifests of the 690 indexed repositories that declare tower as a dependency — not download counts. Dependency data last verified 2026-08-13.

Browse 690 repositories using tower in Repos →
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.

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