Rust keeps showing up in web development conversations. Not as a replacement for JavaScript, but as a tool for specific high-value problems. Here’s where it actually makes sense.

WebAssembly Modules

Rust compiles to WebAssembly with excellent tooling. For CPU-intensive browser operations — image processing, data parsing, cryptographic operations — a Rust-compiled Wasm module can be 10-100x faster than equivalent JavaScript.

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub fn process_image(data: &[u8], width: u32, height: u32) -> Vec<u8> {
    let mut output = Vec::with_capacity(data.len());
    for chunk in data.chunks(4) {
        let gray = (chunk[0] as f32 * 0.299
            + chunk[1] as f32 * 0.587
            + chunk[2] as f32 * 0.114) as u8;
        output.extend_from_slice(&[gray, gray, gray, chunk[3]]);
    }
    output
}

The wasm-bindgen toolchain handles the JavaScript interop. You call this from JS like any other function.

Build Tools

The current wave of Rust-powered build tools is real:

  • SWC — Replaces Babel for transpilation. Used by Next.js.
  • Turbopack — Webpack successor, built in Rust.
  • Biome — Linter and formatter, replaces ESLint + Prettier.
  • Lightning CSS — CSS parser, transformer, and minifier.

These tools are 10-100x faster than their JavaScript equivalents. When your CI pipeline spends minutes in bundling, the speedup matters.

Server-Side Applications

Rust web frameworks like Axum and Actix Web handle extreme throughput with minimal resource usage. If you’re running infrastructure that processes millions of requests and you’re paying for compute by the millisecond, Rust’s efficiency directly saves money.

use axum::{routing::get, Router, Json};
use serde::Serialize;

#[derive(Serialize)]
struct Health { status: String }

async fn health() -> Json<Health> {
    Json(Health { status: "ok".into() })
}

#[tokio::main]
async fn main() {
    let app = Router::new().route("/health", get(health));
    let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
    axum::serve(listener, app).await.unwrap();
}

Where Rust Doesn’t Make Sense

  • CRUD APIs with simple business logic. Node.js, Go, or Python will be more productive.
  • Rapid prototyping. The compiler is strict. That’s a feature for production code and a drag during exploration.
  • Teams without Rust experience. The learning curve is real. Don’t adopt it for resume-driven development.

Use Rust where its strengths — performance, safety, and efficiency — solve a concrete problem you have. That’s increasingly common in web tooling and edge computing, but it’s not everywhere.