Crate

tokio

Asynchronous runtime for Rust — I/O, timers, and tasks.

What it is

Tokio is the dominant async runtime for Rust. It provides an event loop, async I/O for TCP/UDP/files, timers, channels, and a task scheduler. Most async Rust code targets Tokio and uses its types for networking, concurrency, and time.

Why it is commonly used

The de-facto choice for async Rust — web servers, network clients, database drivers, gRPC services, and any application that handles concurrent I/O. Most async-capable libraries in the ecosystem assume a Tokio runtime.

3.0k

Repositories

85%

Actively maintained

2.5k

Updated ≤ 30 days

6.9M

Total stars

2.4k

Owners

Counted from the Cargo.toml manifests of the 3.0k indexed repositories that declare tokio as a dependency — not download counts. Dependency data last verified 2026-09-16.

Browse 2963 repositories using tokio in Repos →

Often used with

Crates that show up unusually often in tokio 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 tokio projects that also use it.

tokio-stream26%tokio-util34.3%tokio-rustls12.4%tower23.3%hyper-util15.1%tonic12.4%tower-http25.9%tokio-tungstenite14.7%opentelemetry-otlp11.6%axum36.6%opentelemetry_sdk12.1%http-body-util15.2%hyper18.5%async-stream12.4%opentelemetry13.1%sqlx12.6%jsonwebtoken11%async-trait45.7%http24.8%futures-util33.1%rustls24.5%tracing-appender12.7%futures55%prost16.2%

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 OpenAI Union Warp Meilisearch Rerun FUTO Tokio Bytecode Alliance Linebender Nushell Qdrant Polars Quickwit Datadog Hyperium Embassy Actix gfx-rs probe-rs Helix Zellij PyO3 Yew Iced Ratatui Leptos Wasmer Tracel AI smol async libp2p Diesel rustls Servo esp-rs Paradigm Matrix.org

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