Axum

Axum is the most popular web framework in the Rust ecosystem (tokio). v0.7 (2024/2025) is built on Hyper 1.0 and standardizes the service trait.

When to Use

• High Performance: When you need millisecond latency (e.g., ad tech, gaming).
• Rust Backend: The default choice for new Rust web projects.
• Type Safety: Extractor pattern guarantees types at compile time.

Core Concepts

Extractors

Declarative data parsing: async fn handler(Json(body): Json<CreateUser>).

Middleware (Tower)

Axum uses tower middleware, meaning you can use any middleware from the ecosystem (timeout, tracing, rate-limit).

Handlers

Async functions that implementation IntoResponse.

Best Practices (2025)

Do:

• Use axum::serve: v0.7 replacement for Server::bind.
• Use sqlx: The standard async SQL query builder for Axum.
• Use tracing: For structured logging.

Don't:

• Don't unwrap: Handle errors with Result<impl IntoResponse, AppError>.

References

• Axum Documentation