Elixir
Elixir is a dynamic, functional language designed for building scalable and maintainable applications.
What detecting Elixir tells you about a site
Elixir runs on the Erlang BEAM VM and almost always means the Phoenix framework on the web. The standout signal is Phoenix LiveView: a persistent WebSocket connection driving server-rendered DOM updates, plus a `_csrf_token` and LiveView-specific data attributes in the HTML. Detecting it tells you the team chose the BEAM for soft-real-time, highly concurrent features (live dashboards, chat, presence) with far less client-side JavaScript than an equivalent SPA would need.
The detail that matters for Elixir
The strongest confirmation is Phoenix LiveView: a WebSocket to `/live/websocket`, `phx-`-prefixed data attributes in the DOM, and a `_csrf_token` meta tag. Without LiveView, a Phoenix app server-renders like any other framework and the BEAM leaves little client-side trace — so a non-LiveView Elixir site is markedly harder to pin than a LiveView one.
Elixir in a real-world stack
When you find Elixir, it rarely travels alone. Phoenix and LiveView; the BEAM/OTP runtime; PostgreSQL as the usual datastore.
About
Elixir is a dynamic, functional language designed for building scalable and maintainable applications.
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`).
Implies
When Elixiris detected, Sourcemap Explorer also marks the following technologies as present (Wappalyzer's implies graph).
FAQ
How do I check if a website is using Elixir?
Open the page in Chrome, click the Sourcemap Explorer toolbar icon, and read the Stack tab. Elixir's fingerprints span response headers, asset URL prefixes, runtime globals and sourcemap paths, and the popup flags Elixir whenever any combination of them is found. The same checks can be reproduced manually in DevTools — see the "How we detect" section above.
What Elixir version can Sourcemap Explorer detect?
Elixir 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 Elixir open source?
Yes, Elixir is open source. The license details are listed on the official site (https://elixir-lang.org), and the codebase typically lives on a public source-control host.
Where can I read more about Elixir?
Official site: https://elixir-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 Elixirand you'll see the exact version pulled from the bundled package.json when sourcemaps are exposed.