Rust
Rust is a multi-paradigm, general-purpose programming language designed for performance and safety, especially safe concurrency.
What detecting Rust tells you about a site
Rust reaches the browser in two very different ways, and the detection nuance matters. Server-side, it powers high-performance APIs and edge functions (Actix, Axum), inferred from `Server` headers and response characteristics. Client-side, it compiles to WebAssembly — and a `.wasm` module in the network tab alongside Rust-flavoured glue code is the clearest signal a team reached for Rust to run compute-heavy work (parsers, crypto, graphics) in the browser. Either way it flags a team optimising hard for performance or correctness.
Rust in a real-world stack
When you find Rust, it rarely travels alone. Axum or Actix on the server; `wasm-bindgen`/`wasm-pack` toolchain when targeting the browser; often alongside a conventional JavaScript UI shell.
About
Rust is a multi-paradigm, general-purpose programming language designed for performance and safety, especially safe concurrency.
Categories: Programming languages
Quick facts
Detection methodology for Programming languages
Programming languages reveal themselves through extension fingerprints (`.php` URLs for PHP, `.aspx` for ASP.NET), framework-specific patterns and (for client-side runtime languages like TypeScript and Sass) the `node_modules/<lang>/package.json` entry inside the sourcemap. Bun, Node.js and Deno on the server side identify themselves via response headers when emitted (`X-Powered-By: Bun`, `X-Bun-Version`).
FAQ
How do I check if a website is using Rust?
Open the page in Chrome, click the Sourcemap Explorer toolbar icon, and read the Stack tab. Rust's fingerprints span response headers, asset URL prefixes, runtime globals and sourcemap paths, and the popup flags Rust whenever any combination of them is found. The same checks can be reproduced manually in DevTools — see the "How we detect" section above.
What Rust version can Sourcemap Explorer detect?
Rust ships as a hosted programming languages rather than a bundled npm package, so version-specific detection isn't always possible. Where the platform leaks a version in response headers (`X-Powered-By`, `Server`, generator meta tags) we surface it; otherwise we report presence only.
Is Rust open source?
Yes, Rust is open source. The license details are listed on the official site (https://www.rust-lang.org), and the codebase typically lives on a public source-control host.
Where can I read more about Rust?
Official site: https://www.rust-lang.org. For Sourcemap Explorer's detection guide, see the deep-dive link below or the related guides in the cross-link section.
Keep reading on Sourcemap Explorer
Practical guides
Alternative tools
Detected by Sourcemap Explorer
Open the popup on any page running Rustand you'll see the exact version pulled from the bundled package.json when sourcemaps are exposed.