How to use prost crate in Rust protobuf

Enable the protobuf feature in axum-extra and use the Protobuf<T> extractor or response type with structs deriving prost::Message.

[dependencies]
axum-extra = { version = "0.12.6", features = ["protobuf"] }
prost = "0.14"

[build-dependencies]
prost-build = "0.14"

use axum::{routing::post, Router};
use axum_extra::protobuf::Protobuf;
use prost::Message;

#[derive(prost::Message)]
struct CreateUser {
    #[prost(string, tag = "1")]
    email: String,
}

async fn create_user(Protobuf(payload): Protobuf<CreateUser>) -> String {
    payload.email
}

let app = Router::new().route("/users", post(create_user));

Using the prost crate in Rust protobuf lets your web server automatically read and write binary Protocol Buffer data. You define your data structure once, and the library handles the complex encoding and decoding for you. It's like having a universal translator that ensures your data stays consistent between different services.