Scala
Scala is a general-purpose programming language providing support for both object-oriented programming and functional programming.
What detecting Scala tells you about a site
Scala is a JVM language favoured for data-intensive and concurrent backends, so its web fingerprints look JVM-shaped (a `JSESSIONID` cookie, a Play Framework or Akka HTTP `Server` signature) rather than language-specific. Detecting it points to a team that wanted functional programming and strong typing on the JVM — frequently in data engineering, fintech or large-scale streaming systems where Spark and the Scala ecosystem are central.
The detail that matters for Scala
Scala hides behind the same generic JVM signals as Java and Kotlin. The clearest Scala-specific tells are a Play Framework `PLAY_SESSION` cookie or an `akka-http/<version>` `Server` header — and Akka HTTP often sits behind a reverse proxy that strips it. Without one of those, attributing a JVM backend specifically to Scala is low-confidence.
Scala in a real-world stack
When you find Scala, it rarely travels alone. Play Framework or Akka HTTP on the web tier; the broader JVM and big-data ecosystem (Spark, Kafka) behind it.
About
Scala is a general-purpose programming language providing support for both object-oriented programming and functional programming.
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 Scala?
Open the page in Chrome, click the Sourcemap Explorer toolbar icon, and read the Stack tab. Scala's fingerprints span response headers, asset URL prefixes, runtime globals and sourcemap paths, and the popup flags Scala whenever any combination of them is found. The same checks can be reproduced manually in DevTools — see the "How we detect" section above.
What Scala version can Sourcemap Explorer detect?
Scala 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.
Where can I read more about Scala?
Official site: https://www.scala-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 Scalaand you'll see the exact version pulled from the bundled package.json when sourcemaps are exposed.