Rust HTTP Server with Axum

Build a type-safe HTTP server in Rust using Axum with extractors, JSON responses, error handling, and state sharing. Includes route definitions, middleware.

Rust Data Fetching Updated: 2026-01-15

Code

snippet

use axum::{
  extract::State,
  http::StatusCode,
  response::Json,
  routing::get,
  Router,
};
use serde_json::{json, Value};
use std::sync::Arc;

struct AppState {
  db: String,
}

async fn health() -> &'static str {
  "OK"
}

async fn get_data(State(state): State<Arc<AppState>>) -> Result<Json<Value>, StatusCode> {
  Ok(Json(json!({"db": state.db, "data": []})))
}

#[tokio::main]
async fn main() {
  let state = Arc::new(AppState { db: "postgres".into() });
  let app = Router::new()
    .route("/health", get(health))
    .route("/api/data", get(get_data))
    .with_state(state);
  let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
  axum::serve(listener, app).await.unwrap();
}