Building a Secure REST API with Rust and Actix-web

Rust's memory safety guarantees make it an excellent choice for building secure web APIs. In this tutorial, we'll build a complete REST API using the Actix-web framework.

First, create a new Rust project:

cargo new secure-api
cd secure-api

Add these dependencies to your Cargo.toml:

[dependencies]
actix-web = "4"
serde = { version = "1", features = ["derive"] }
jsonwebtoken = "9"
bcrypt = "0.15"

Here's our basic server setup with middleware:

use actix_web::{web, App, HttpServer, middleware};

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(|| {
        App::new()
            .wrap(middleware::Logger::default())
            .route("/health", web::get().to(health_check))
    })
    .bind("127.0.0.1:8080")?
    .run()
    .await
}

Implementing JWT-based authentication ensures our API endpoints are secure. We use the jsonwebtoken crate for token generation and validation.

To prevent abuse, we implement rate limiting using a sliding window algorithm. This limits each IP to 100 requests per minute.

Rust's type system and ownership model help us build APIs that are both fast and secure by default. The Actix-web framework provides excellent performance while maintaining developer ergonomics.