This page lists developers who know the most about, and help maintain, core MediaWiki components, key extensions and skins, libraries and other Wikimedia technical infrastructure.
| Component | Description | Steward[1] | Individual maintainer[2] | Consulted[3][4] | Informed[5] |
|---|---|---|---|---|---|
| API | MediaWiki's web-based"action" API that lets people interact with MediaWiki programmatically.
| MW Engineering (MW Interfaces) | Legoktm | ||
| Authentication and Authorization | Components related to user authentication and authorization, including login and signup (AuthManager), session handling (SessionManager), BotPasswords, and password storage.
| MW Engineering (MW Platform) | Gergő Tisza | ||
| BagOStuff | The wikimedia/bagostuff library (BagOStuff, WANObjectCache, Redis/Memcached clients) and their MediaWiki integrations.
| MW Engineering (MW Platform) | |||
| Benchmarker | Facility for benchmarking backend latency and resource usage.
| MW Engineering (MW Platform) | |||
| Blocks | Creating and managing user blocks, including Special:Block, Special:BlockList, and their APIs, hooks, and database tables. This was separated out from "User management" in 2020.
| Trust and Safety Product | |||
| Comment store | Storing comments such as edit summaries, and log action reasons. Including access layers, value interfaces, and their database schema.
| Unassigned | formerly Core Platform | ||
| Categories | All issues relating to categories.
| Unassigned | Bawolff | ||
| Change tagging | The feature that allows putting tags on revisions, log entries etc. added from edit filters in Extensions (AbuseFilter, TorBlock, etc).
| Unassigned | |||
| Configuration | The Config and ExtensionRegistry components, for registering and loading site configuration and extensions.
| Unassigned | Legoktm, formerly Core Platform | ||
| ContentHandler | Representation of content values and their formatting. For the storing of content, see Revision-backend instead.
| Unassigned | Daniel Kinzler, formerly Core Platform | ||
| Core testing | Configuration and base classes for checkers, unit testing, and integration testing (PHPUnit, QUnit, etc).
| Unassigned | Timo Tijhof,Antoine Musso | Daimona Eaytoy | |
| Debug Logger | Debug logging functions, debug toolbar, and PSR-3/Monolog integration.
| Unassigned | |||
| DjVu | All issues related to DjVu
| Structured Data (details and SLA) | |||
| DeferredUpdates | The DeferredUpdates mechanism allows code to be scheduled after the HTTP web response has been sent to the browser.
| Unassigned | formerlyPerformance | ||
| Documentation | Meta issues about MediaWiki core documentation both Doxygen/JSDuck-generated and on mediawiki.org
| Unassigned | APaskulin,Timo Tijhof | ||
Issues relating to the email notification features and email address verification (e.g. Special:EmailUser, and Special:ConfirmEmail)Not to be confused with the "Notifications" component, below.
| Unassigned | 01tonythomas | |||
| File management | Management of uploaded files (images, thumbnails,etc.)
| Unassigned | |||
| Gallery | Gallery of media files as created by wikitext <gallery> tag.
| Unassigned | |||
| Hooks | Hook system
| MW Engineering (MW Interfaces) | Tim Starling, formerly Core Platform | Web (for changes to any hooks relating to skins) | |
| HtmlFormatter | A library for HTML parsing and manipulation
| Unassigned | Web (for any changes that might impact mobile) | ||
| HTMLForm | HTMLForm
| Unassigned | |||
| HTML Templating | Mustache HTML templating (server-side in PHP, and client-side viamw.template)
| Unassigned | Web (when making any significant library updates) | ||
| HTTP Cache | CDN purging andFileCache storage.
| Unassigned | Aaron Schulz,Timo Tijhof, formerlyPerformance | ||
| Installer | Installation, setup, and upgrade procedure.
| Unassigned | Jon Robson (happy to provide assistance in understanding the installer or code review if needed), James Forrester, Reedy | ||
| Internationalization | All issues relating to internationalization, localization, translation, and the MediaWiki namespace.
| Language and Product Localization | Raimond Spekking,Federico Leva | ||
| Interwiki | Interwiki database and cache
| Unassigned | |||
| JobQueue | Job queue
| MW Engineering (MW Interfaces) | Aaron Schulz | ||
| Language converter | Script & regional term conversion for several languages, e.g. Chinese and Serbian.(Problem area -- not much developer capacity here.)
| MW Engineering (Content Transform) | Liangent,Robin Pepermans,Winston Sung, Chiefwei (Chinese language) | ||
| Logging | Special:Log, mw_logging table
| Unassigned | Umherirrender | ||
| Maintenance system | The Maintenance script system in MediaWiki core.
| Unassigned | Sam Reed | ||
| Media handlers | Interface for extracting metadata and transforming media files, and the implementations thereof that ship with MediaWiki core. The built-in media handlers include for example extracting camera metadata from JPEG, and generating thumbnails from JPEG, PNG, SVG and other files.The interface is consumed by the Parser andImageinfo API. The transformation methods of media handlers together make up the default image scaler and thumbnail service in core, and form the basis forPdfHandler,TimedMediaHandler, andDjVu extensions. Note that at WMF, the thumbnail service for still images is disabled in favour ofThumbor.
| Unassigned | |||
| Merge history | The MergeHistory logic and its API and Special page frontend. | MW Engineering (MW Interfaces) | |||
| Mime | The wikimedia/mime library parses MIME types of uploaded files and maps file extensions for static resources via the MimeAnalyzer service.
| Unassigned | formerlyPerformance | ||
| Notifications | Built-in notifications framework. Allows MediaWiki and extensions to send notifications to users. See also#MediaWiki extensions → Echo for notifications delivery.
| MW Engineering (MW Platform) | |||
| Output Transform | Post processing ParserOutput contents
| MW Engineering (Content Transform) | Web (for changes to any visual changes) | ||
| Page deletion | Issues related to deleting and undeleting/restoring pages and revisions (viaaction=delete and Special:Undelete).
| MW Engineering (MW Interfaces) | Aaron Schulz | ||
| Page derived data | Management of data derived from a page, including PageUpdater, LinksUpdate, RefreshLinks, and the database for storing this derived data (such aspage_props, andlink tables). | Unassigned | Daniel Kinzler, formerly Core Platform | MW Engineering (Content Transform) | |
| Page-Diffs | All issues relating to the page displaying differences between two revisions (diff=, oldid=, type=revision in the URL).
| Unassigned | Web (for changes to any visual changes) | ||
| Page editing | All issues relating to the edit screen, edit conflicts, and saving edits.
| Editing | |||
| Page-History | All issues relating to the page displaying the history of revisions via the action=history view or Special:History page..
| Unassigned | Web (for changes to any visual changes) | ||
| Page protection | Protection and unprotection of pages, and issues with protected pages | Unassigned | formerly Core Platform | ||
| Parser | Issues relating to the wikitext parser, which converts wikitext markup into HTML. Including ParserOutput and ParserCache.
| MW Engineering (Content Transform) | Web (if changing anything that might impact how the page is rendered) | ||
| Parsoid integration | Issues relating to MediaWiki's integration with the next-generation Parsoid parser.
| MW Engineering (Content Transform) | |||
| Patrolling | New page patrolling, edit patrolling. "[mark as patrolled]". rc_patrolledetc. | Unassigned | Marius Hoch | ||
| Profiler | Issues relating to MediaWiki's built-in Profiler.
| MW Engineering (MW Platform) | |||
| Recent changes | Bug reports and feature requests related to the special page RecentChanges.
| Moderator Tools | |||
| Redirects | All issues relating to redirects. | Unassigned | Sam Reed | ||
| Revision backend | Issues related to the backend classes around revisions, blobs, and slots. Including Multi-Content-Revisions (MCR).
| Unassigned | formerly Core Platform | ||
| ResourceLoader | ResourceLoader delivery and management system for loading modules in MediaWiki.
| MW Engineering (MW Platform) | Roan Kattouw, Web (please consult on anything that might impact page load/defaults) | Web (for changes to any performance-impacting changes) | |
| MW REST API | MediaWiki's web-based RESTful API framework that lets people interact with MediaWiki programmatically.
| MW Engineering (MW Interfaces) | |||
| Revision deletion | Hiding and unhiding of individual page revisions, log entries and usernames and revision suppression.
| MW Engineering (MW Interfaces) | Aaron Schulz | ||
| Rdbms | The wikimedia/rdbms library for interacting with relational databases, and its MediaWiki integration.
| MW Engineering (MW Interfaces) | Ladsgroup (SRE Data Persistence) | ||
| Router | JavaScript module for parsing and matching in-page navigation routes (i.e. hash fragments).
| Unassigned | originally:Jon Robson | ||
| Search | Issues relating to the search engine. Note that Wikimedia web sites do not use the default MediaWiki search engine; please file bugs against their Search under "CirrusSearch" instead!
| Search Platform | |||
| Sites | Information about other sites
| Unassigned | |||
| Shell | Shell framework for calling external binaries.
| Unassigned | |||
| Skin system | Issues relating to the skin system, including Skin base classes, ResourceLoader integration, and the provided skinning stylesheets.
| Web | mediawiki‑skins group,Bartosz Dziewoński | ||
| Snapshots | Issues relating to XML snapshot generation and loading (maintenance scripts, API, interface at Special:Export/Special:Import)
| Unassigned | |||
| Special pages | Issues relating to the SpecialPage framework, and the configuration and wiring relating to special pages in general.With the exception of built-in maintenance reports, issues about specific special pages should be reported under their own dedicated components instead (e.g. Page deletion, Recent changes, Search, Preferences, Watchlist, etc.).
| Unassigned | |||
| Stats | Stats service for Statsd/Prometheus.
| MW Engineering (MW Platform) | SRE/Observability (Cole White) | ||
| Templates | All issues relating to templates and template inclusion. | Unassigned | Jackmcbarn | ||
| Uploading | File upload interface at Special:Upload. (Issues with already uploaded files should be filed under "File management")
| Unassigned | |||
| UUID | The Wikimedia\UUID library and the GlobalIdGenerator service wiring that uses it.
| Unassigned | Aaron Schulz,Timo Tijhof, formerlyPerformance | ||
| User login and signup | Account creation, login, etc. Settings bugs in this component should be moved to the "User preferences" component. | Unassigned (Growth?) previously:Wikimedia Product Infrastructure,Core Platform. | Gergő Tisza | Web | |
| User management | Permissions and authorization
| Unassigned | Jack Phoenix | ||
| User preferences | The preferences system (sometimes known as user options or user properties), including the PreferencesFactory and UserOptionsManager services, their interface (Special/API), and database table.
| Unassigned | Moderator Tools | ||
| User rename | Provides a special page that allows user accounts to be renamed
| Unassigned | Marius Hoch | ||
| Watchlist | Bug reports and feature requests related to the special page Watchlist.
| Moderator Tools | Watchlist Expiry:Community Tech | Web (for changes to any performance-impacting changes) |
| Extension | Description | Steward[1] | Individual maintainer[2] | Consultants[4] |
|---|---|---|---|---|
| 3d | Enables upload of three-dimensional model files, and supports thumbnailing and interactive viewing inMedia Viewer. | Structured Data (details and SLA) | ||
| AbuseFilter | Allows privileged users to set specific controls on actions by users, such as edits, and create automated reactions for certain behaviors | (Active volunteer) | Marius Hoch,Daimona Eaytoy,se4598,Matěj Suchánek | |
| AdvancedSearch | Enhances Special:Search by providing an advanced parameters form | WMDE Engineering (contact EMs) | ||
| AntiSpoof | Prevents creation of confusable usernames | Trust and Safety Product | Sam Reed | |
| ApiFeatureUsage | Access API feature usage log summaries | MW Engineering (MW Interfaces) | ||
| ArticleCreationWorkflow | Community Tech | |||
| ArticlePlaceholder | Provides a special page with Wikidata information about a certain topic, with invitation to create an article for the topic | WMDE Engineering (contact EMs) | ||
| AutoModerator | Allows moderators to configure automated prevention or reversion of bad edits based on scoring from a machine learning model | Moderator Tools | Jason Sherman,Susana Cardenas Molinar | |
| Babel | Adds a parser function to inform other users about language proficiency and categorize users of the same levels and languages | Language and Product Localization | ||
| BetaFeatures | Allows other extensions to register their beta features in the user preferences | Unassigned | ||
| BounceHandler | Allow MediaWiki to handle bounce email efficiently with VERP headers | Unassigned | 01tonythomas,Jgreen (wmf) | |
| Calendar | Creates a Calendar in pages | Unassigned | ||
| CampaignEvents | Adds tools for organizing events | Connection Team | ||
| Campaigns | Allows to track user account creations related to campaigns | Unassigned | ||
| Capiunto | Provides basic Infobox functionality for Scribunto | Unassigned | Marius Hoch | |
| CategoryTree | Provides a dynamic view of the wiki's category structure as a tree | Unassigned | ||
| CentralAuth | Allows to merge accounts into global accounts | MW Engineering (MW Platform) | Zabe | |
| CentralNotice | Adds a central sitenotice | Fundraising tech [primarily for FR use cases] | ||
| CharInsert | Create JavaScript character insert boxes | Editing | ||
| CheckUser | Allows a user with permissions to check which IPs are used by a given username and which usernames are used by a given IP | Trust and Safety Product | Dreamy Jazz | |
| CirrusSearch | Implements searching for MediaWiki using Elasticsearch | Search Platform | ||
| Cite | Allows footnotes for citing sources and helps for correctly citing content in offline media | Editing | Marius Hoch | |
| CiteThisPage | Adds a special page that provides different citation formats for a particular article | Unassigned | Marius Hoch | |
| Citoid | Extension part of the Citoid service | Editing | ||
| CLDR | Import localisation data fromCLDR | Language and Product Localization | ||
| CodeEditor | Provides a syntax-highlighting code editor for site & user JS, CSS and Lua pages, integrating with advanced edit toolbar | Editing | Derk-Jan Hartman | |
| CodeMirror | Provides syntax highlighting in MediaWiki's wikitext editor. | Community Tech | MusikAnimal | |
| Cognate | Centralises Wiktionary links into Wikidata | WMDE Engineering (contact EMs) | ||
| Collection | Allows organization of personal selections of pages in a collection that can be edited, persisted and optionally retrieved as PDF, ODF or DocBook (XML) | Unassigned Under review | C. Scott Ananian originally: PediaPress | |
| CommonsMetadata | Extracts metadata from commons pages | Structured Data (details and SLA) | ||
| CommunityConfiguration | Allows editors with extended rights the ability to configure on-wiki functionality for all users. | Growth | ||
| ConfirmEdit | Adds CAPTCHAs for page saves and other user actions. Only QuestyCaptcha is supported. | Editing | Emufarmers,Florianschmidtwelzow | |
| ContactPage | Provides a contact form for visitors | MW Engineering (Content Transform) -SLA details | Ammarpad | |
| ContentTranslation | Allows editors to translate an article from one language to another with the help of machine translation and other aids. | Language and Product Localization | ||
| CreditsSource | Display source work credits in the page footer | Unassigned | ||
| Dashiki | Renders the JSON used to configure dashiki dashboards in a friendly HTML table | Data Engineering | ||
| Disambiguator | Enables the designation of disambiguation pages with a magic word | Unassigned | ||
| DiscussionTools | Tools to enhance discussion pages | Editing | ||
| DismissableSiteNotice | Allows users to close the sitenotice | Unassigned | ||
| DonationInterface | Provides fundraising mechanisms for collecting payments | Fundraising tech | ||
| DynamicPageList (Wikimedia) (aka Intersection) | Outputs a bulleted list of most recent items residing in a category, or an intersection of several categories | Unassigned | Brian Wolff | |
| DynamicSidebar | Shows a dynamic sidebar based on user configuration | Unassigned | Derick Alangi | |
| EasyTimeline | Produces an embedded timeline image from special syntax inside<timeline> tags. | Unassigned | Antoine Musso (knows about the code) | |
| Echo | Delivers notification messages to users. See also#MediaWiki core → Notifications. | Growth(Needs New Owner) | ||
| EmailAuth | The extension allows secondary authentication via email. | Unassigned, stewardship currently being decided | Tgr,KHarlan (WMF) | |
| Elastica | Provides base elasticsearch functionality | Search Platform | ||
| ElectronPdfService | Converts wiki pages to PDFs using Electron. | WMDE Engineering (contact EMs) | ||
| EntitySchema | Stores Shape Expressions Schemas on wiki pages (for Wikidata). | WMDE Engineering (contact EMs) | ||
| EventBus | Propagates change events to a RESTful service. Transports data between arbitrary applications, in the form of events that conform to versioned schemas. | Data Platform Engineering | — | |
| EventLogging | Provides logging and validation of web analytics events | Experiment Platform | ||
| EventStreamConfig | Exposes event stream configs in an API endpoint. Can also be used to expose configs via ResourceLoader. | Data Engineering (Andrew Otto) | ||
| ExtensionDistributor | Enables the distribution of extensions from www.mediawiki.org | Unassigned | Tim Starling | |
| ExternalGuidance | Indicates to users that the wiki page being viewed is served through an external service, and provides ways to contribute back to the original wiki. | Language and Product Localization | ||
| FeaturedFeeds | Adds syndication feeds of wiki's featured content | MW Engineering (Content Transform) -SLA details | ||
| FileExporter | Provides a link to export local files to another wiki that has theFileImporter extension. | WMDE Engineering (contact EMs) | ||
| FileImporter | Allows for the easy importing of a file from one wiki to another. | WMDE Engineering (contact EMs) | ||
| FlaggedRevs | Allows for article content management by "editor" and "reviewer" classes | Unassigned Under Review | Aaron Schulz, Amir Sarabadani | |
| StructuredDiscussions (aka Flow) | A modern discussion and collaboration system | Growth(Needs New Owner) | ||
| FundraiserLandingPage | Enables template parameters to be passed as querystring elements | Fundraising tech | ||
| FundraisingTranslateWorkflow | Locks down translation publishing rights on selected pages | Fundraising tech (Elliott Eggleston) | ||
| FundraisingEmailUnsubscribe | Donor-facing fundraising email unsubscribe form (on payments.wikimedia.org) | Fundraising tech | ||
| Gadgets | Allows users to enable JS-based, user-provided gadgets from their preferences page | Unassigned | Roan Kattouw,Ammarpad,Timo Tijhof,SD0001 | |
| GeoCrumbs | Adds a trail of bread crumbs to the page | Unassigned | ||
| GeoData | Adds geographical coordinates storage and retrieval functionality | Search Platform | ||
| GlobalBlocking | Allows IP addresses to be blocked on multiple wikis | Trust and Safety Product | ||
| GlobalCssJs | Allows global CSS and JS on a "central" wiki to be loaded for all wikis in the farm | Unassigned | ||
| GlobalPreferences | Allows a user to decide which user preferences to set as global (wikifarm-wide) and which to keep local. | Community Tech | ||
| GlobalUsage | Enables viewing of global image use in a wiki farm with shared image repository | Structured Data (details and SLA) | ||
| GlobalUserPage | Enables global (shared between wikis) user pages on a wiki farm | Unassigned | ||
| GlobalWatchlist | Allows a user to view changes to watched pages on multiple sites at once | (Active volunteer) | DannyS712 | |
| GoogleNewsSitemap | Outputs a list of pages based on what categories they are in as an RSS feed or Google news sitemap | Unassigned | Brian Wolff | |
| Graph | Data-driven graphs | Editing | ||
| GrowthExperiments | Contains experiments done by the Growth team | Growth | ||
| GuidedTour | Deliversguided tours | Growth(Needs New Owner) | ||
| ImageMap | Allows clickable HTML image maps | Editing | ||
| ImageSuggestions | Image recommendation features for experienced users | Structured Data (details and SLA) | ||
| InputBox | Allows users to add predefined HTML forms to wiki pages | Unassigned | ||
| Insider | Lists volunteer tour guides for travel destinations | Unassigned | ||
| Interwiki | Adds a special page to view and manipulate the interwiki table | Unassigned | ||
| InterwikiSorting | Allows sorting of interwiki links | WMDE Engineering (contact EMs) | ||
| IPInfo | Displays IP information for anti-vandalism purposes | Trust and Safety Product | ||
| IPReputation | Provides access for fetching, logging, and acting on IP reputation data | Trust and Safety Product | ||
| Josa | Automatesjosa part of Korean postposition process | Unassigned | ||
| JsonConfig | Provides a wiki-based JSON configuration system | MW Engineering (Content Transform) -SLA details | ||
| Kartographer | Allows adding maps to pages | MW Engineering (Content Transform) | Mateus Santos | |
| LabeledSectionTransclusion | Enables marked sections of text to be transcluded | Unassigned | ||
| LandingCheck | Send users to localized landing pages with fallback options | Fundraising tech | ||
| Linter | Help users find out-dated bits of wikitext to fix them | MW Engineering (Content Transform) | ||
| LiquidThreads | A structured discussion system for MediaWiki | Unassigned | ||
| LoginNotify | Notify users of suspicious logins | Community Tech | ||
| MapSources | Gives access to several data and mapping sources | Unassigned | ||
| MassMessage | Allows users to send messages across wikis | Unassigned | ||
| Math | Renders mathematical formulas between <math> ... </math> tags | Editing | Derk-Jan Hartman,Moritz Schubotz | |
| MediaModeration | Checks uploaded media for possible child exploitation content. | Trust and Safety Product | formerly Platform Engineering, Core Platform. | |
| MediaSearch | An alternative, media-focused way to display search results through the Special:MediaSearch page. | Structured Data (details and SLA) | ||
| MetricsPlatform | Provides Metrics Platform derived stream configs to EventStreamConfig via hook. | Data Products | Sam Smith,Santiago Faci,Clare Ming | |
| MobileApp | Serves styles and scripts for use in the Wikimedia native apps | Apps,MW Engineering (Content Transform) -SLA details | ||
| MobileFrontend | Optimizes content for mobile experiences. | Web (SLA details) | ||
| MultimediaViewer | Provides a better experience to users when they click on thumbnails in a page | Structured Data (details and SLA) | ||
| NavigationTiming | Logs perceived latency measurements from client-side | Unassigned | formerlyPerformance | |
| NetworkSession | A SessionProvider for api requests based on configured ip address and a secret token | Search Platform | Erik Bernhardson | |
| Newsletter | Adds a preference for newsletter subscription | (Active volunteer) | 01tonythomas,Brian Wolff (for emergency issues) | |
| NewUserMessage | Adds a message to newly created user's talk pages | Growth(Needs New Owner) | ||
| Nuke | Gives sysops the ability to mass delete pages | Moderator Tools | ||
| OATHAuth | An HMAC based One Time Password extension, providing two-factor authentication | MW Engineering (MW Platform) | Taavi Väänänen | |
| OAuth | Allow users to safely authorize another application (Consumer) to use the MediaWiki api on their behalf | MW Engineering (MW Platform) | Tgr (WMF),Ammarpad | |
| OAuthRateLimiter | Implements an OAuth hook to add rate limit values to the OAuth JSON Web Token (JWT) | MW Engineering (MW Platform) | ||
| ORES | Integrates data from the ORES project into the RecentChanges view | Machine Learning/Scoring Platform | ||
| PageAssessments | Stores assessments of pages made by WikiProjects | Community Tech | ||
| PagedTiffHandler | Handles TIFF files, including multi-paged images | MW Engineering (Content Transform) -SLA details | ||
| PageImages | Stores information about images representing a page | Web (SLA details) Pending stewardship review | ||
| PageNotice | Displays notices at the top of all pages in a namespace | (Active volunteer) | TTO | |
| PageTriage | Facilitates reviewing and approving new pages | Moderator Tools | Novem Linguae | Sohom Datta |
| PageViewInfo | Provides fancy looking graphs of Wikimedia page view data | Unassigned | ||
| ParserFunctions | Enhances parser with logical and string functions | MW Engineering (Content Transform) | Jackmcbarn,Tim Starling? | |
| ParserMigration | Allows users to preview the appearance of articles with the new Parsoid parser | MW Engineering (Content Transform) | ||
| PdfHandler | Handles PDF files like multipage DJVU | MW Engineering (Content Transform) -SLA details | bawolff | |
| Phonos | Text to speech parser and inline audio player | Language and Product Localization | Community Tech | |
| Poem | Adds <poem> tag for poem formatting | Unassigned | ||
| Popups | Displays popups when users hover over article links (aka. Hovercards) | Web (SLA details) | ||
| ProofreadPage | Helps proofreading of books. | (Active volunteer) | Thomas PT (Tpt),Sohom Datta (mostly on the Javascript/interface side of things) | |
| PropertySuggester | Provides suggested properties when a user tries to add new statements to a Wikidata item. | WMDE Engineering (contact EMs) | ||
| QuickSurveys | Provides in-article quick surveys or external survey to poll readers for opinions. | Web (SLA details) | ConsultWeb for large architectural changes or UBN bugs. Others are feel free to contribute and merge changes to this extension. | |
| Quiz | Quiz building tool adopted on the Wikiversity | Unassigned | ||
| ReadingLists | Provides an API for storing and retrieving private lists of pages. | MW Engineering (Content Transform) -SLA details | ||
| RelatedArticles | Parser function to associate related articles (cf. Wikivoyage) | Web (SLA details) | ||
| RealMe | Allows verifying URLs used on user pages | (Active volunteer) | Taavi Väänänen | |
| ReportIncident | Allow users to report incidents of harassment and abuse. | Trust and Safety Product | ||
| RevisionSlider | Visualizes revision history | WMDE Engineering (contact EMs) | ||
| RSS | Displays RSS feeds on a wiki page | Unassigned | ||
| SandboxLink | Provides a link in personal tools to a per-user sandbox | Unassigned | Matma Rex (Bartosz Dziewoński) | |
| SecureLinkFixer | Automatically rewrites URLs to HTTPS if domain always requires HTTPS (T200745) | Unassigned | Legoktm, formerly Core Platform | |
| Score | Allows rendering of musical scores withen:LilyPond | Editing | Alexander Klauer,Ebe123 | |
| Scribunto | Provides a framework for embedding scripting languages into MediaWiki pages | Unassigned | Tim Starling,Victor Vasiliev,Jackmcbarn,cscott, formerly Core Platform; possibly Content Transform | |
| SearchExtraNS | Searches extra specified namespaces if no direct match is found | Unassigned | ||
| SearchVue | Vue.js augmentations and improvements to Special:Search | Structured_Data_Across_Wikimedia | ||
| SecurePoll | Extension for elections and surveys | Trust and Safety Product | Huji,SD0001,Novem Linguae | |
| ShortUrl | Adds a special page that redirects to an article based on the given base36-encoded ID | Unassigned Under review | ||
| SimilarEditors | Adds a special page for discovering editors with similar edit histories | Trust and Safety Product | ||
| SiteMatrix | A special page with a matrix of all Wikimedia sites | Unassigned | ||
| SpamBlacklist | Provides a regex-based spam filter | Unassigned (under review) | ||
| StopForumSpam | Blocks write actions based upon stopforumspam.com deny lists | Wikimedia Security (SBassett (WMF),Reedy) | Legoktm | |
| SubPageList3 | Provides a splist tag to list the subpages of a page | Unassigned | ||
| SubpageSortkey | Changes the default sortkey to have something to do with the subpages | Unassigned | Brian Wolff | |
| SyntaxHighlight | Provide a wikitext feature to embed source code examples on wiki pages with syntax highlighting. Powered by Pygments via Shellbox, and includes a VisualEditor plugin. | Editing | SD0001 | |
| TemplateData | Creates and extracts data about templates and their usage | Editing | ||
| TemplateSandbox | Enables page previews using sandboxed templates | Unassigned | Jackmcbarn | |
| TemplateStyles | Allows for loading sanitized CSS stylesheets from a template | MW Engineering (Content Transform) | Gergő Tisza | |
| TemplateWizard | Adds a popup dialog box for adding template code to wikitext. | Community Tech | Samwilson | |
| TextExtracts | Provides API with plain-text or limited HTML extracts of page content | Web (SLA details) Pending stewardship review. | ||
| Thanks | Lets users thank other users for individual edits | Growth(Needs New Owner) | ||
| TheWikipediaLibrary | Notifies users of their eligibility for the Wikipedia Library when they cross the edit count and account age thresholds | Moderator Tools | Jason Sherman,Susana Cardenas Molinar | |
| TimedMediaHandler | Provides integrated support for server side transcoding, WebM, Ogg Theora, Vorbis, Speex and Timed Text | Unassigned | Brooke Vibber (Emergency Backup: Structured Data) | |
| TitleBlacklist | Blocks the creation of pages matching a regular expression blacklist | Unassigned | Jackmcbarn | |
| TocTree | Adds options for floated or expanded table of contents (cf. Wikivoyage) | Unassigned | ||
| TorBlock | Automatically applies restrictions to Tor exit nodes with access to the wiki's front-door server | Unassigned | formerlyCore Platform. | |
| Translate | Enables in-wiki translation and proofreading | Language and Product Localization | ||
| TranslationNotifications | Allows translators sign up for translation notifications | Language and Product Localization | ||
| TrustedXFF | Handles trusted proxy addresses (XFF) | Unassigned | formerlyCore Platform. | |
| TwoColConflict | Provides an interactive two-column edit conflict resolution tool | WMDE Engineering (contact EMs) | ||
| UniversalLanguageSelector | Allows users to select a language and configure its support in an easy way. | Language and Product Localization | ||
| UploadsLink | Provides a link in personal tools to a user's uploads | Unassigned | Jdlrobson | |
| UploadWizard | Helps people upload media to Commons. | Structured Data (details and SLA),Mark Holmquist | ||
| UrlShortener | Provides a basic URL shortening service | Unassigned | formerlyCore Platform. | |
| VisualEditor | Enables a rich-text editor for wiki pages (see alsoParsoid) | Editing | ||
| WebAuthn | A module for OATHAuth extension that provides authentication using WebAuthn API | MW Engineering (MW Platform) | Taavi Väänänen | |
| WikibaseClient | Client for structured data repository | WMDE Engineering (contact EMs) | ||
| WikibaseRepository | Structured data repository | WMDE Engineering (contact EMs) | ||
| WikibaseCirrusSearch | Implements searching for Wikibase repositories using Elasticsearch | Search Platform | ||
| WikibaseLexeme | Structured lexicographical data | WMDE Engineering (contact EMs) | ||
| WikibaseLexemeCirrusSearch | Implements searching for Wikibase Lexemes using Elasticsearch | Search Platform | ||
| WikibaseMediaInfo | Wikibase extension to manage structured metadata of media files | Structured Data (details and SLA) | ||
| WikibaseQualityConstraints | Wikibase extension to check editor-defined constraints on entity data | WMDE Engineering (contact EMs) | ||
| Wikidata.org | Specific code for Wikibase as running on Wikidata.org | WMDE Engineering (contact EMs) | ||
| WikidataPageBanner | Adds pagewide banners at the top of pages in specified namespaces on a wiki. | Web (SLA details) | ||
| WikiEditor | Provides an extendable wikitext editing interface and many feature-providing modules | Editing | Derk-Jan Hartman | |
| wikihiero | Enables the use of hieroglyphs with additional syntaxes | Unassigned | Max Semenik | Jdlrobson |
| WikiLambda | Enables a wiki to host functions written, managed, and evaluated by users | Abstract Wikipedia | ||
| WikiLove | Makes it easy to add positive feedback to user talk pages | Unassigned | Jdlrobson | |
| WikimediaApiPortalOAuth | The WikimediaApiPortalOAuth extension is designed to connect theAPI Portal with theOAuth server on Meta-Wiki. It provides a user interface to create and manage OAuth 2.0 clients. | Unassigned | formerlyCore Platform. | |
| WikimediaBadges | Default themes to display badges on Wikimedia projects | WMDE Engineering (contact EMs) | ||
| WikimediaCampaignEvents | Wikimedia-specific add-ons for theCampaignEvents extension | Connection Team | ||
| WikimediaEditorTasks | Task generation, storage, and API service for microcontribution suggestions | MW Engineering (Content Transform) | ||
| WikimediaEvents | Event instrumentations and wiring for Wikimedia Foundation sites | Data Products | See OWNERs.md file for individual owners of each schema. | |
| WikimediaIncubator | Adds functions meant for Wikimedia Incubator | (Active volunteer) | Jon Harald Søby(and currently inactive:Robin Pepermans,Hydriz,Ebe123) | |
| WikimediaMaintenance | Various WMF-specific maintenance scripts | Unassigned | Sam Reed | |
| WikimediaMessages | Adds Wikimedia specific messages and grammar, as well as Wikimedia specific overrides for license related messages | Unassigned | Maarten Dammers | |
| Wikisource | Community Tech | Tpt | Sohom Datta | |
| Wikistories | Language and Product Localization (SBisson) | |||
| XAnalytics | Communicates analytic information for WMF to logging infrastructure | Unassigned |
| Skin | Phabricator tag | Description | Steward[1] | Individual maintainer[2] | Consultants[4] |
|---|---|---|---|---|---|
| Vector | #Vector | MediaWiki's default skin since 2010; outcome of theUsability Initiative. The Web team does not triage any tasks for Vector tagged with one of: #Responsive-Vector, #Reading-Web-Local-Wiki-Issues, #MediaWiki-Core-Testing. | Web (SLA details) | ||
| MinervaNeue | #MinervaNeue | A mobile-first skin for Wikipedia. | Web (SLA details) | ||
| Timeless | #Timeless | A fully featured skin that emphasises both content and editing tools. | Unassigned | Isarra | Jon Robson |
| MonoBook | #MonoBook | An old skin from 2004, in grey. | Web (SLA details) | Bartosz Dziewoński | |
| CologneBlue | #CologneBlue | An old skin from 2002, in blue. | Web (SLA details) | Bartosz Dziewoński | |
| Modern | #Modern | An old, unsupported skin from 2008. | Web (SLA details) | ||
| Nostalgia | #Nostalgia | An old, unsupported skin that pretends to be UseMod. Only available onhttps://nostalgia.wikipedia.org | Web (SLA details) | ||
| WikimediaApiPortal | #WikimediaApiPortal | WikimediaApiPortal is a skin for MediaWiki created by the Wikimedia FoundationCore Platform in 2020 as part of theAPI Gateway initiative. The skin is designed to mimic the look and feel of conventional developer portals by incorporating header and sidebar navigation elements and following the Wikimedia Design Style Guide. The skin uses the Bootstrap CSS framework,OOUI library, and Mustache templates. The skin was created for use with the WikimediaAPI Portal, so some elements of the design such as the site logo and footer are specific to Wikimedia. | Unassigned | formerly Core Platform |
For upstream libraries that we bundle, seeUpstream projects. For other libraries that we publish seedoc.wikimedia.org (includes developer dependencies, and projects not used by MediaWiki).
See also thecomposer.json andforeign-resources.yaml files in MediaWiki core.
Frontend and backend libraries that are published by Wikimedia and bundled with MediaWiki core.
| Library | Repository | Issue tracker | Steward | Individual maintainer | Language(s) |
|---|---|---|---|---|---|
| VisualEditor | Gerrit | Phabricator | Editing (Ed Sanders) | JS | |
| UnicodeJS | Gerrit | Phabricator | Editing (David Chan,Ed Sanders) | JS | |
| jquery.uls | GitHub | GitHub | Language and Product Localization (Santhosh Thottingal) | JS | |
| jQuery.IME | GitHub | GitHub | Language and Product Localization (Santhosh Thottingal) | JS | |
| jQuery.i18n | GitHub | GitHub | Language and Product Localization (Santhosh Thottingal) | JS | |
| jQuery WebFonts | GitHub | GitHub | Language and Product Localization (Santhosh Thottingal) | JS | |
| wikimedia/css-sanitizer | Gerrit | Phabricator | Unassigned | originally:Gergő Tisza | PHP |
| wikimedia/equivset | Gerrit | Phabricator | Unassigned | originally:Brooke Vibber | PHP |
| wikimedia/lucene-explain-parser | Gerrit | Phabricator | Search Platform | PHP | |
| wikimedia/textcat | Gerrit | Phabricator | Search Platform (Trey Jones) | PHP | |
| wikimedia/zest-css | Gerrit | Phabricator | Content Transform (C. Scott Ananian) | PHP | |
| wikimedia/metrics-platform | GitLab | Phabricator | Data Products | JS, PHP |
There are manyupstream projects on which MediaWiki, extensions, and/or Wikimedia depend. Some of them were "invented here", as stand-along libraries, or split out as part of theLibrary infrastructure for MediaWiki project. Some of them are widely-used third party tools to which community members provide improvements or support. Others are merely used with gratitude.
Note: If you need immediate help with a systems administration question, please go into theIRC channel#wikimedia-operationsconnect and findthe person currently on Ops Clinic duty" (as listed in the/topic).
| Service | Description | Steward[1] | Individual maintainer[2] | Consultants[4] |
|---|---|---|---|---|
| API Gateway | The API Gateway is a service that runs in Kubernetes based on Envoy. The service implements many features central to serving the unified API and the API portal. | Unassigned | formerlyCore Platform | |
| Add A Link | The Link Recommendation Service recommends phrases of text in an article to link to other articles on a wiki. Users can then accept or reject these recommendations. The services consists of theresearch/mwaddlink python application and thelinkrecommendation service deployed in Kubernetes | Add a Link teams | ||
| AS Report | Generation of public asoranking monthly dataset and accompanying webpage. | Unassigned | formerlyPerformance,Timo Tijhof | |
| Arc Lamp | Collect sample profiles from production traffic usingExcimer and aggregate into flame graphs. | SRE Observability | formerlyPerformance | |
| navtiming | Webperf processor service between Navigation Timing extension and Grafana. | Unassigned | formerlyPerformance, SRE Observability | |
| Backup & data recovery management | Backups and recoveries are normallyself-served & automated (setting up new backups, generating them, recovering from, but Data Persistence "owns" the setup and maintenance of the infrastructure, and can support people needing help for the centralized setup (using Bacula, MinIO and Python), specially for new, large projects with special needs. | SRE >Data Persistence (Jaime Crespo) | ||
| CDN (HAProxy, Varnish, ATS) | Infrastructure for CDN caching and global traffic routing between data centers. See alsoSLO/HAProxy,SLO/Varnish, andSLO/Trafficserver. | SRE > Traffic | ||
| ChangeProp | Change propagation | Unassigned | formerlyCore Platform | |
| Citoid | Citoid | Unassigned | formerlyCore Platform | |
| Cloud Services | Wikimedia Cloud Services computing infrastructure, the Toolforge hosting environment, and many additional supporting technologies used in the Cloud Services environment.https://wikitech.wikimedia.org/wiki/Help:Cloud_Services_introduction | Wikimedia Cloud Services | ||
| Continuous integration | The WMF CI infrastructure, includingJenkins,Zuul, and thehttps://integration.wikimedia.org/ portal. | Release Engineering(as of 2016-09-21) | integration group | |
| cxserver | cxserver | Language and Product Localization | ||
| DNS | Issues relating to the nameserver configuration. | SRE > Traffic | ||
| Databases (MariaDB) | Administration and troubleshooting of Database servers. | SRE > specially (but not only)DBAs.wikitech:MariaDB | ||
| Elasticsearch | Search engine as used by MediaWiki in production, via the CirrusSearch extension. See alsoSLO/Search. | Search Platform | ||
| Etherpad | Anything related to Wikimedia's installation of Etherpad orEtherpad Lite.https://wikitech.wikimedia.org/wiki/etherpad.wikimedia.orghttps://etherpad.wikimedia.org | SRE > Collaboration Services | Mark Holmquist, Alexandros Kosiaris, Daniel Zahn | |
| Etcd (Main cluster) | State management for WMF tier 1 production services, including for Varnish and MediaWiki. See alsoSLO/etcd main cluster. | SRE > Service Operations | ||
| Extension setup | New extensions to get installed or enabled. Just like 'Site configuration' but more specific. | Release Engineering(as of 2016-09-21) | Sam Reed | |
| Fresh | Fast and ready-to-use Docker container with developer tools for Node.js and headless browsers. | Release Engineering | ||
| Fundraising Misc. | A catch-all for miscellaneous fundraising-related components not covered by MediaWiki extensions and civicrm. See:https://wikitech.wikimedia.org/wiki/Fundraising | FR Tech | ||
| Graphite | https://graphite.wikimedia.org/ - a real-time performance graphing system | SRE | ||
| Gerrit | Issues with Wikimedia's Gerrit installation for code review and Git repository historing, atgerrit.wikimedia.org | Release Engineering(as of 2016-09-21) | ||
| GitLab | Release Engineering, SRE > Collaboration Services | |||
| IDM | The account creation and login portal for Wikimedia Developer accounts (sometimes known as "LDAP" or "Gerrit" accounts) located at idm.wikimedia.org (codenamed "Bitu"). | SRE > Infrastructure Foundations | ||
| Image-suggestion service | HTTP API exposing data from theImage Suggestions pipeline to theImageSuggestions MediaWiki extension. | Structured Data | formerlyCore Platform | |
| irc.wikimedia.org | Issues with Recent Changes feeds on irc.wikimedia.org. For help with Libera Chat IRC (e.g. cloaks or channels), refer to #wikimedia-ops instead or checkmeta:IRC/Cloaks. | Data Engineering | ||
| IRC Bots | Issues with bot tools on Libera IRC that are not in "WM-Bot" or "Wikibugs". Cloak/channel requests etc should go to #wikimedia-ops or to meta. Seemeta:IRC/Cloaks. | (Active volunteer) | Petr Bena | |
| ircservserv | Manages IRC channel configuration through declarative files in Git. | (Active volunteer) | Legoktm,Taavi | |
| Kask | Kask is an opaque key-value data store with a RESTful (HTTP) interface. | Unassigned | formerlyCore Platform | |
| Mailing lists | Issues relating to the mailing lists/Mailman. See:m:Mailing lists/Administration,https://lists.wikimedia.org,https://wikitech.wikimedia.org/wiki/Mailman | SRE | Ladsgroup,Legoktm | |
| Mathoid | Mathoid is being phased out as part ofRESTBase sunsetting (T338429) | Unassigned | Moritz Schubotz, formerlyWikimedia Services | |
| Media storage | Storage infrastructure for images, videos and other media files from Wikimedia Commons and other wikis. Currently based on Swift. | SRE (Filippo Giunchedi,Matthew Vernon) | ||
| Icinga | [1] | SRE | ||
| ipoid | The ipoid service provides an API for retrieving reputation data for individual IP addresses, as well as retrieving lists of IP addresses matching a particular set of labels (e.g. list of IP addresses that are associated with VPNs). | Trust and Safety Product | ||
| NOC | contains public copies of our configuration files.https://noc.wikimedia.org andhttps://wikitech.wikimedia.org/wiki/noc.wikimedia.org | Unassigned | ||
| ORES | ORES / ores.wikimedia.org | Scoring platform | ||
| performance.wikimedia.org | The performance.wikimedia.org portal, including the Excimer UI (excimer-ui-client, excimer-ui-server), and XHGui web apps (Phabricator). | SRE Observability | formerlyPerformance | |
| Phabricator | Configuration of Wikimedia's Phabricator installation. | Release Engineering | Andre Klapper, andadministrators | |
| Phatality | OpenSearch Dashboards plugin to easily associate errors with Phabricator Tasks. | Ahmon Dancy,Brennen Bearnes,Cole White,Jaime Nuche | ||
| php-excimer | Low-overhead sampling profiler and interrupt timer. | MW Engineering (MW Platform) | Tim Starling | |
| php-luasandbox | Safely execute untrusted Lua 5.1 code. | Unassigned | Tim Starling | |
| php-wikidiff2 | Fast diff engine. | WMDE Engineering (contact EMs) | Tim Starling | |
| php-wmerrors | Extended error handling and display. | Unassigned | Tim Starling, formerlyPerformance | |
| poolcounter | Low-latency mutex deamon to protect against load spikes (Gerrit,Phabricator). | MW Engineering (MW Platform) | Tim Starling | |
| Proton | Render PDF versions of Wikipedia articles. | MW Engineering (Content Transform) | ||
| PyBal | Automation and monitoring for LVS. | SRE Traffic (Valentin Gutierrez), and SREService Ops (Giuseppe Lavagetto) | ||
| RESTBase | Wikimedia REST API (aka RESTBase) is an API router in front of certain Node.js services, i.e.Citoid,Mathoid (formerly:Parsoid,Graphoid). | Unassigned | formerlyCore Platform | |
| RT | https://rt.wikimedia.org - managing the procurement queue.https://wikitech.wikimedia.org/wiki/RT | SRE | ||
| Statsv | Intake service for stats from MediaWiki JavaScript, forwarding it to Statsd/Graphite. | SRE Observability | formerlyPerformance | |
| Scap | WMF deployment tool for MediaWiki and other services. | Release Engineering | ||
| Shellbox | Secure and isolated execution of external libraries, such as Lilypond (for MediaWiki Score extension), and Pygments (for MediaWiki SyntaxHighlight extension). The service runs in Kubernetes and uses the Shellbox PHP library, which is lacking an owner (listed above under Libraries) | SRE ServiceOps | ||
| Snapshots | Snapshots of MediaWiki content provided in datasets for external re-use. https://dumps.wikimedia.orghttps://wikitech.wikimedia.org/wiki/DumpsWMF Projects/Data Dumps | Unassigned | Hydriz, formerlyCore Platform, WMCS,WMDE Engineering (contact EMs) | |
| Technical Blog | The Wikimedia Tech Blog, a WordPress installation (hosted by Automattic.com).Source code | WikimediaDeveloper Advocacy | ||
| Thumbor | Thumbnail service for Wikimedia wikis, especially rendering of SVG files (which represents the majority of thumbnail-related configuration requests and upgrades). | Unassigned | TheDJ? | |
| Vagrant (mediawiki-vagrant) | Virtual environment for bootstrapping MediaWiki development | Release Engineering(as of 2016-09-21) | ||
| VRT System | The platform used for the Volunteer Response Team, historicaly based on the OTRS software. | SRE > Service Operations | User:Madman, Peter Gervai | |
| wikibugs IRC bot | Announces changes to Phabricator tasks on IRC -https://wikitech.wikimedia.org/wiki/wikibugs | Legoktm,Valhallasw | ||
| Wikimedia Portals | Wikimedia Portals | Web | JDrewniak | |
| XHGui | Graphical interface for PHP profiling data captured by WikimediaDebug. | SRE Observability. | formerlyPerformance | |
| Sanitarium | The redaction process ("redactatron") that hosts and prepares production databases such that they can safely replica public information to Wikimedia Cloud Services. | SRE Data Persistence (Jaime Crespo is most familar, but not maintainer) | ||
| varnishkafka | Aggregate and transport in-memory logs from all Varnish frontend CDN nodes into Kafka for offline processing. | SRE > Traffic (Valentin Gutierrez) | ||
| WikiKube | The "WikiKube" Kubernetes cluster, and the MediaWiki-on-Kubernetes helm charts, power all Wikimedia Foundation wikis. This includes configuration of Apache and PHP (such as for portals, rewrites rules). Phabricator:Wikimedia-Apache-conf,MW-on-K8s. | SRE > Service Operations | ||
| Wikidata Query Service | See alsoSLO/WDQS. | Search Platform | ||
| WikimediaDebug | Debug and profile MediaWiki web requests in production. | Release Engineering | ||
| wikimediafoundation.org | https://techblog.wikimedia.org/, a WordPress install hosted by Automattic.com,https://blog.wikimedia.org.Source code | WMF Communications | ||
| Zotero translation-server | Service that is in support of the citoid service. | Editing |
These include a selection of Toolforge tools and Cloud VPS projects that are maintained by Wikimedia Foundation and/or heavily used as part of the development process.
| Component | Repository | Issue tracker | Steward[1] | Maintainers[6] | Note |
|---|---|---|---|---|---|
| Beta Cluster | Developer Experience | beta.wmflabs.org | |||
| Codesearch | Gerrit | Phabricator | Unassigned | ||
| Wikipedia Android app | GitHub | Phabricator | WMF Mobile Apps | ||
| Wikipedia for iOS | GitHub | Phabricator | WMF Mobile Apps | ||
| MediaWiki config at WMF | Gerrit | Phabricator | Release Engineering(as of 2016-09-21) | Sam Reed | MediaWiki configuration of Wikimedia Foundation sites. |
| LibUp | GitLab | Phabricator | Unassigned | Taavi Väänänen | LibUp (aka libraryupgrader) is a semi-automatic service that upgrades libraries and other developer dependencies for all our software repositories hosted on Gerrit. |
| Patch demo | GitLab | Phabricator | Developer Experience | Bartosz andEd are volunteer maintainers | Used for spinning up test instances with in progress Gerrit patches |
| pixel.wmcloud.org | QTE | Web | Visual regression testing | ||
| MediaWiki interwiki map at WMF | Gerrit | Phabricator | Unassigned | This, that and the other |
This table lists tools and sites which benefit from clarity around ownership as they behave differently to other sites, or have their own deploy processes outside the standard train.
| Component | Description | Steward[1] | Maintainers[6] |
|---|---|---|---|
| www.wikipedia.org | Wikipedia Portal (outdated) | Web | Jan Drewniak |
| donate.wikimedia.org /thankyou.wikipedia.org | Production wikis, notable for being used exclusively for Fundraising purposes. | Fundraising tech, WMF Advancement | |
| payments.wikimedia.org | External wiki dealing with sensitive deta, hosted separately, in the "payments" cluster. See alsowikitech:payments.wikimedia.org. | Fundraising tech, WMF Advancement | |
| enterprise.wikimedia.org | Wikimedia Enterprise | Wikimedia Enterprise | |
| translatewiki.net | Translations (independent project) | Language and Product Localization |
(Not all of them fit in current projects.)