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" Enter fullscreen mode Exit fullscreen mode 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 , } Enter fullscreen mode Exit fullscreen mode User → the stored data structure CreateUser…