Crate

async-trait

Async functions in Rust traits via a proc-macro.

What it is

async-trait provides a #[async_trait] attribute macro that enables async fn in trait definitions. Before native async-in-traits were stabilized in Rust 1.75, this was the only way to define async methods in traits, using Box<dyn Future> internally.

Why it is commonly used

Historically ubiquitous in async Rust codebases for defining async interfaces. Still widely used in codebases that need object-safe async dispatch or that target Rust editions before async trait stabilization.

1.4k

Repositories

91%

Actively maintained

1.3k

Updated ≤ 30 days

3.7M

Total stars

1.2k

Owners

Counted from the Cargo.toml manifests of the 1.4k indexed repositories that declare async-trait as a dependency — not download counts. Dependency data last verified 2026-08-13.

Browse 1398 repositories using async-trait in Repos →

Often used with

Crates that show up unusually often in async-trait 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 async-trait projects that also use it.

aws-config13.4%moka11.4%tracing-opentelemetry15.9%opentelemetry-otlp19.1%prometheus13.9%opentelemetry_sdk19.8%opentelemetry21.5%utoipa10.3%jsonwebtoken18%tonic19.5%async-stream19.7%sqlx19.5%tower35.2%tower-http37.8%rcgen11.9%argon211.5%aes-gcm13.4%tokio-tungstenite21.2%hyper26.8%tokio-util48.3%tokio-stream36.5%prost24.2%dashmap29.2%http-body-util21.2%

Used by these organizations

Cloudflare Mozilla AWS Microsoft Google Oxide Computer Parity Technologies Deno Zed Industries Fly.io Turso PingCAP SurrealDB Embark Studios Buoyant Vercel The Rust Project Fuel Labs Astral Tauri Warp Meilisearch Rerun Tokio Bytecode Alliance Qdrant Polars Quickwit Datadog Zellij Leptos Wasmer Tracel AI Rust CLI WG Diesel rustls esp-rs Paradigm Matrix.org

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