Dart
Dart is an open-source, general-purpose, object-oriented programming language developed by Google.
About
Dart is an open-source, general-purpose, object-oriented programming language developed by Google.
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`).
How we detect Dart
Each signal alone is rarely conclusive — Sourcemap Explorer cross-references all of them and weights by confidence. You can reproduce any of these checks yourself in Chrome DevTools.
Cookies set by the platform. Visible in DevTools → Application → Cookies.
DARTSESSID
Window-level global the technology installs on page. Reproducible by typing the path into the DevTools console.
window.$__dart_deferred_initializers__
window.___dart__$dart_dartObject_ZxYxX_0_
window.___dart_dispatch_record_ZxYxX_0_
Script URL pattern. Typically a CDN host or chunk path that ships with the technology.
/(?:\.)?(?:dart)(?:\.js)?/
FAQ
How do I check if a website is using Dart?
Open the page in Chrome, click the Sourcemap Explorer toolbar icon, and read the Stack tab. The popup matches Dart's fingerprint signals (response headers, asset URL prefixes, runtime globals, sourcemap paths) and flags it whenever any combination is found. The same checks can be reproduced manually in DevTools — see the "How we detect" section above.
What Dart version can Sourcemap Explorer detect?
Dart 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 Dart open source?
Yes, Dart is open source. The license details are listed on the official site (https://dart.dev), and the codebase typically lives on a public source-control host.
Where can I read more about Dart?
Official site: https://dart.dev. 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 Dartand you'll see the exact version pulled from the bundled package.json when sourcemaps are exposed.