Extensions are features and add-ons developed for MediaWiki, the software platform that Fandom runs on. They are designed by Fandom staff or third-party developers for the purpose of either expanding the function of a wiki or overriding a built-in MediaWiki feature for customization purposes.
How to request an extension
First, verify that the extension you are looking for does not exist already on your community. You can check this by going to Special:Version and looking under the "installed extensions" section or checking the extension's parser function or tag against the "tags" and "hooks" section at the bottom of that page. Fandom already has a significant number of extensions enabled by default.
Many other extensions already exist in the Fandom codebase and can be enabled upon request. You can check what extensions Fandom offers later in this page. Some basic content tools, such as Variables, are automatically enabled by staff when requested. In the case of other complex extensions, such as DPL, a staff member will usually ask a few questions first to ensure that the extension you are asking for is in fact the ideal solution. Other extensions, where resulting site configuration may be dramatically changed (such as AbuseFilter), will be enabled at staff discretion depending on the context of the request.
If Fandom does not offer a particular extension, you may request Fandom engineering team investigate installing it by using Special:Contact and linking to the MediaWiki extension page along with some rationale as to why it's needed. Please be aware that the engineering team may take a few months to review the extension and that most extensions will be rejected. This is mainly due to the amount of rewriting an extension would require to live on the Fandom codebase servers. As such, it's always good to ask yourself, when looking at an extension on MediaWiki.org, whether the extension is up to date, is well-maintained, and allows for a caching layer. If the answer to any of these questions is no, chances are Fandom will not be able to install the extension.
Extensions active by default
Users and admins
- Global CSS and JS
- Displays edit count of a user
- AJAX based gadget to display the category structure of a community
- Adds <ref[ name=id]> and <references/> tags, for citations
- DPL-based forum extension using article pages.
- Editors can create timelines of events using this tool's syntax.
- Adds <googlespreadsheet> tag for Google Docs' spreadsheets display
- Allows client-side clickable image maps using <imagemap> tag
- Allow inclusion of predefined HTML forms
- Allows users to upload up to 20 files at once
- Enhance parser with logical functions
- Adds <poem> tag for poem formatting
- Set up single-choice polls
- Provides a random media picker using <randomimage />
- Displays a random option from the given set
- RSS feed extension
- Displays an RSS feed on a page
- TabView and Tabber
- Methods for having "tabbed" content
- Video Embed Tool
- Embeds videos from YouTube, Metacafe and many other sites
- Syntax to display hieroglyphs
Spam and blocking
- Simple spambot blocking mechanism
- Simple captcha implementation
- Regex based anti URL spam tool
- Adding meta-description tag containing snippet of the Article
- Allow users to upload new files directly from edit page
- Shared Help
- Provides the Help namespace pages from Community Central into all Fandom sites (controlled globally)
- Provides an interface for sending messages seen on all Fandom sites
- Code syntax highlighter - supports many languages
Available on request
- Add badges to users to encourage contributions
- Allows for embedding of a calendar into pages
- Community JS
- Allows for site JS (not including ImportJS)
- Community Page
- Provides a page for the community, to list things that need to be done on the wiki
- Content listing tool, which adds the <dpl> tag
- Creates and allows usage of "gadgets" for users
- Maps Extension
- Easily create Earth-based maps with wiki-fied markers
- Recent Changes Patrol
- Tells if edits conform to the policies of the wiki
- Allows you to define a variable on a page then use it later in that same page
- Provides parser functions for performing loops
- Provides parser functions that operate on arrays
- Defines an additional set of parser functions that operate on strings
These extensions have restricted access and administrators are only given access when there is a clear and current need for them.
- Tool for automatically catching non-constructive edits.
- Grants users with the appropriate permission the ability to check user's IP addresses and other information. (This is generally a staff-only tool, but a few administrators of big wikis also have access to it.)
- Protect site
- Allows Fandom staff, Fandom Helpers and VSTF to temporarily block various site modifications (this is enabled as deemed needed, and local administrators of a wiki do not have access to it).
- Semantic MediaWiki
- Used on a few dozen Fandom sites, including some of the biggest, but often problematic (due to performance and stability concerns) and no longer requestable. Its "Help" page on this wiki redirects here, but discussion may be best confined to Semantic MediaWiki's official documentation site.
- MediaWiki Extensions List at MediaWiki.org, the homepage of MediaWiki software
Further help and feedback
- Browse and search other help pages at Help:Contents
- Check Fandom Community Central for sources of further help and support
- Check Contacting Fandom for how to report any errors or unclear steps in this article
- Learn how to use Fandom in Fandom University: short how-to videos for all levels of experience