Is there any newer architecture diagram of joomla CMS?

I know the https://docs.joomla.org/Archived%3aCMS_Architecture_in_1.5_and_1.6 but it is from 2011 so pretty outdated.

Also is there one zoom-level in more detail about Joomla CMS architecture?

1 Answer 1


Unfortunately there is nothing like this for Joomla 4 yet. With all the amount of work that's gone into it, there's not a major amount of documentation yet.

You can however use some other resources to help:

That said, as far as I'm aware, I don't believe there are major architecture changes that you need to apply when developing an extension.

You may also want to download a copy of Joomla 4 and sift through some of the core extensions to see how they work.

  • I see you are a core developer. Is there no easy way to extract from the source packaging the software architecture of joomla? (Comming from Java and here I can easily use a UML reverse engineering tool)
    – cilap
    Commented Jan 3, 2019 at 10:28
  • Unfortunately you're asking the wrong person. I was doing UI and Javascript development for Joomla, not the PHP side. Perhaps ask on the Joomla Forum or post a new issue on the Github Issue Tracker
    – Lodder
    Commented Jan 3, 2019 at 10:31
  • This is a pretty old slide, but maybe it helps as well: joomla.digital-peak.com/images/blog/… or this one joomla.digital-peak.com/images/blog/… Commented Jan 3, 2019 at 11:55

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