How to Tell If a Website Is Built With Joomla

Joomla is a veteran open-source content management system that once rivalled WordPress for popularity and still powers a large number of established websites. To tell whether a site is built with it, the quickest answer is to view the source and look for a generator meta tag reading "Joomla! - Open Source Content Management", or for option=com_ in its URLs. This guide covers every reliable signal, the structure behind them, and what a Joomla build tells you about the site.

What is Joomla?

Joomla is a PHP-based, open-source CMS first released in 2005 as a fork of Mambo. For years it occupied the middle ground between WordPress and Drupal: more structured and capable than early WordPress, but friendlier than Drupal. It offers a component-and-module architecture, multilingual support, access-control levels and a large directory of extensions and templates, which made it a popular choice for small-to-mid-sized business sites, clubs, schools, associations, governments and community portals through the late 2000s and 2010s.

For detection purposes, the key context is that WordPress's overwhelming dominance has gradually reduced Joomla's market share, so today Joomla most often appears on established sites built some years ago rather than brand-new projects. That makes detecting it informative: a Joomla site frequently signals an organisation with an older web presence, often maintained by an in-house administrator or a small agency, and sometimes a candidate for modernisation or migration. Modern Joomla (versions 4 and 5) has been substantially rebuilt on a Bootstrap-based front end and a cleaner codebase, so newer Joomla sites do still exist and look more contemporary.

How Joomla renders and exposes itself

Joomla exposes a consistent set of fingerprints rooted in its architecture. The most explicit is the generator meta tag, which by default reads <meta name="generator" content="Joomla! - Open Source Content Management">. Joomla's URL routing is also distinctive: in its non-rewritten form it routes to components via index.php?option=com_content&view=article&id=..., and even with search-engine-friendly URLs enabled you will often find /component/ paths and references to com_-prefixed components in the markup. Joomla components live under /components/com_<name>/, modules under /modules/, and templates under /templates/<template-name>/.

Static assets reveal the version family. Joomla 3 loaded its UI library from /media/jui/ and system scripts from /media/system/js/, while Joomla 4 and 5 use /media/vendor/ and a Bootstrap 5 front end. Modern Joomla also injects a joomla-script-options new script tag carrying JSON configuration, and exposes a global Joomla JavaScript object with helpers like Joomla.Text. Knowing this structure — the generator tag, the option=com_ routing, the /media/system/ and /templates/ paths, and the Joomla global — makes detection reliable even on a customised template.

How to tell if a website uses Joomla

Confirm at least two of the following.

1. View the page source. Search for joomla and generator. The <meta name="generator" content="Joomla! ..."> tag is the most explicit signal. Also look for the joomla-script-options script.

2. Inspect asset paths. Look for references under /media/system/, /media/jui/ (Joomla 3), /media/vendor/ (Joomla 4/5) and /templates/<name>/. These directory conventions are characteristic of Joomla.

3. Look at the URLs. URLs containing option=com_content, /component/, or other com_ components indicate Joomla's routing. Even with friendly URLs, component references often appear in links or forms.

4. Use the console. Type Joomla and press Enter. A returned object (with helpers like Joomla.Text or Joomla.getOptions) confirms a modern Joomla front end.

5. Probe well-known paths. The administrator login lives at /administrator/, a long-standing Joomla convention. A /templates/system/ directory and the default README.txt historically confirmed Joomla too.

What the Joomla signals look like

<meta name="generator" content="Joomla! - Open Source Content Management">
<script type="application/json" class="joomla-script-options new">{"csrf.token":"...","system.paths":{...}}</script>
GET /media/system/js/core.min.js
GET /templates/cassiopeia/css/template.css
URL: index.php?option=com_content&view=article&id=42
window.Joomla = { Text: {...}, getOptions: ƒ, ... }

The combination of the Joomla generator tag, the /media/system/ or /templates/ paths, and option=com_ routing is conclusive.

Joomla versus similar systems — avoiding false positives

Joomla's signals are distinctive, but keep the CMS family straight. WordPress uses /wp-content/, /wp-includes/ and the wp- prefix; Drupal uses /core/, /sites/, drupalSettings and a Drupal generator tag; Joomla uses /media/system/, /templates/, option=com_ and a Joomla generator tag. The com_ component prefix and the /administrator/ login are particularly unique to Joomla. The main subtlety is that security-conscious or heavily customised Joomla sites sometimes remove the generator meta tag and use friendly URLs that hide option=com_, so in those cases rely on the /media/system/ or /media/vendor/ asset paths and the Joomla global. The shift from /media/jui/ (Joomla 3) to /media/vendor/ (Joomla 4/5) is also a useful version indicator.

How reliable is each Joomla signal?

The Joomla generator meta tag is definitive when present, as is option=com_ routing combined with /components/com_ references. The /media/system/, /media/jui/ and /media/vendor/ asset paths are strong because they reflect Joomla's fixed structure. The Joomla JavaScript global and the joomla-script-options script are reliable confirmations on modern sites. The /administrator/ login path is supportive. The weakest situation is a hardened site that strips the generator tag and uses fully rewritten URLs — there, the /media/ asset paths and the Joomla global carry the proof. As a rule, the generator tag or an option=com_ URL settles it; otherwise corroborate with asset paths.

What a Joomla build reveals about an organisation

A Joomla site most often signals an established small-to-mid-sized organisation — a local business, club, school, association, place of worship or community group — whose site was built during Joomla's popular years, frequently by an in-house administrator or a small web agency. Because Joomla's share has declined, its presence can indicate a site that has not been rebuilt in some time, which is useful intelligence: such sites are common candidates for a refresh, a migration to a modern platform, or updates to address security and performance. That said, a Joomla 4 or 5 site (identifiable by /media/vendor/ paths and a Bootstrap 5 template) signals an actively maintained, modernised install. If you sell web design, migration, hosting or security services, a Joomla build — especially an older one — flags a prospect who may be due an upgrade.

Joomla in a typical stack

Joomla sites usually sit on standard PHP shared or managed hosting, often with a popular template framework and a handful of extensions for SEO, forms, galleries or e-commerce (VirtueMart or HikaShop on commerce sites). You may find a caching plugin and a CDN in front for performance, and security extensions to harden the /administrator/ area. The template name visible in /templates/<name>/ paths can reveal whether the site uses a commercial framework or a custom build. For an auditor, the useful details are the Joomla version family (Joomla 3 via /media/jui/ versus Joomla 4/5 via /media/vendor/), the template in use, any commerce or SEO extensions, and the hosting environment; together these tell you how current the install is and whether it is a modernisation candidate.

A quick Joomla confirmation walkthrough

Open the site and view the page source (Ctrl+U / Cmd+Option+U). Search for generator to find the Joomla meta tag, then search for /media/system/ or /templates/ to confirm the asset structure. Look at internal links and forms for option=com_ or /component/ references. Open the console and type Joomla to confirm the global object on modern sites. Finally, note whether assets load from /media/jui/ (Joomla 3) or /media/vendor/ (Joomla 4/5) to gauge the version. Two of these signals together confirm Joomla and indicate roughly how current the install is.

A quick Joomla detection checklist

• View source and search for the <meta name="generator" content="Joomla! ..."> tag.
• Look for asset paths under /media/system/, /media/jui/ or /media/vendor/ and /templates/.
• Check URLs for option=com_ and /component/ routing.
• Type Joomla in the console to confirm the global object on modern sites.
• Note the /administrator/ login path as corroboration.
• Use /media/jui/ vs /media/vendor/ to distinguish Joomla 3 from Joomla 4/5.

Detecting Joomla at scale

Checking one site is quick, but auditing many — to find ageing Joomla sites ripe for migration, or to map CMS usage across a region or sector — calls for automation. StackOptic detects Joomla, its version family where exposed, and thousands of other technologies from a real browser. Pairing Joomla detection with performance, mobile-friendliness and security signals quickly surfaces the older installs most in need of attention, which makes a ready-made prospect list for agencies offering redesigns, migrations or maintenance. Re-scanning over time also reveals when a Joomla site is finally rebuilt on a newer platform — a transition worth catching early. For related reading, see our guide to telling what CMS a website is using and the full Joomla technology profile.