Tokio Tutorial

What it is

Tokio is the asynchronous runtime most Rust network software runs on, including the Axum web framework and SQLx. The Tokio tutorial on tokio.rs is the official guide to it. Across the chapters you build Mini-Redis, a small Redis client and server, so every idea is tied to working code rather than toy examples.

What it covers

The chapters go in this order: overview, setup, hello Tokio, spawning tasks, shared state, channels, I/O, framing, async in depth, select and streams. Further topic pages cover bridging async code with synchronous code, graceful shutdown and tracing. For backend developers, the chapters on spawning, shared state and channels explain what happens inside every Axum handler, and the graceful shutdown page is what you need before deploying.

Is it worth doing?

Yes, once the Rust book feels comfortable. Most Rust backend confusion comes from async: why a value must be Send, why a lock cannot be held across an .await, why blocking code stalls other requests. This tutorial answers those questions better than framework docs do, because the framework docs assume you already know them.

How long it takes

About one to two weeks of evenings if you type the code as you go. The "async in depth" chapter, which builds a tiny executor to show how futures are polled, is the hardest part and the most rewarding.

Prerequisites

The tutorial says readers should already be familiar with Rust and points to the Rust book. Some experience writing networking code helps but is not required, and no Redis knowledge is needed.

Free or paid?

Free. Tokio itself is open source under the MIT licence.

What you can do after it

Structure async Rust code with tasks and channels, share state safely with Arc and Mutex, avoid blocking the runtime, use tokio::select! for timeouts and cancellation, and shut a server down cleanly. Axum will then read as a thin layer over ideas you already understand.

Common questions

Do I need this to use Axum? You can start Axum without it, but you will hit async errors quickly; the shared state and spawning chapters save hours.

Is there a reference as well? The API documentation on docs.rs covers every type in detail.