If you're learning Rust and want to build APIs, Axum is one of the best frameworks to start with.

In this tutorial, we'll build a simple CRUD API (Create, Read, Update, Delete) using:

✅ Axum

✅ In-memory storage (no database)

✅ Beginner-friendly concepts

What We Will Build

A simple User API with these endpoints:

Method Route Description

POST /users Create a user

GET /users Get all users

GET /user/:id Get a single user

PUT /user/:id Update a user

DELETE /user/:id Delete a user

Step 1: Setup Dependencies

Add this to your Cargo.toml :

[dependencies] axum = "0.7" tokio = { version = "1" , features = [ "full" ] } serde = { version = "1" , features = [ "derive" ] } serde_json = "1"

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Step 2: Define Our Data

#[derive(Debug, Serialize, Deserialize, Clone)] struct User { id : u32 , name : String , email : String , }

#[derive(Deserialize)] struct CreateUser { name : String , email : String , }

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User → the stored…