To create

These are just suggestions. Feel free to comment in the talk-section.

• A userscript alowing users to click on an "update from online source" button on .tab pages. It should replace the data with new data from its stated online source. For example from an online .csv or .xlx file, or from a JSON rest-API at well-known statistical sites. Tomastvivlaren (talk) 23:50, 6 July 2025 (UTC)
• A script to extract data from a en:Template:Graph:Chart or en:Template:Graph:Line wikicode, and convert it to a .tab JSON file.  Done, see graphDataImport
• A script to get a formatted list of uploads, category-members, …
• A plugin to install scripts loaded with &withJS= – URL parameter to the user’s common or skin.js
• A script-installer which is invokable by a template (URL-params maybe) with a step-by-step wizard (done for gadgets → Template:ActivateGadget)
• A global-user-page and settings wizard allowing to create and update the userpage on several wikis.  Done
• A slideshow-framework using templates and script like Image Annotator or {{ImageStack}} with customizable caption-boxes, slide-effects, drag&slide, preview thumb-bar, …
• Integrate code for VIC and FPC nomination in MediaWiki:Gadget-QInominator.js.
• An autotranslate-template creation wizard  Done, see AutotranslateHelper — 0x010C ^~talk~ 09:40, 4 April 2017 (UTC)
• Refractor MediaWiki:Gadget-LanguageSelect.js: Multiple language-preferences, showing a (+) like HotCat allowing to add a translation (create an input on-the-fly) to push i18n forward
• Script to show 1-3 file examples in parent categories from their child categories (Special:Permalink/84246834#Galleries in Categories)
• Rewrite DerivativeFX as a JavaScript application m:WMDE Technical Wishes/Move files to Commons ^phab:T190716
• A tool to visually explore Flickr-Images from streams/sets/… before uploading and allowing to unselect some of them by given criteria
• A script to allow admins to close undeletion requests like closing deletion requests with MediaWiki:Gadget-DelReqHandler.js (maybe inside delreqhandler)  Done here by Perhelion
• A tool similar to Help:QuickDelete but instead of adding deletion templates you can choose to add {{Opaque}}, {{Convert to SVG}} or {{BadJPEG}}.

Scripts without il8n

• Category:User scripts needing internationalisation

Other

• MediaWiki:Gadget-ChooseResolution.js, MediaWiki:Gadget-dictionaryLookupHover.js not installed as a gadget
• MediaWiki:Gadget-Tag.js – ? not installed

Learning

• Wikibooks (de, en)
• mw:ResourceLoader/Default modules
• jQuery – code less, do more
• Usability drafts by Guillaume Paumier

Testing

You can test any script by running it from your console or put the code in a Special:MyPage/test.js and hit “preview”.

• jsfiddle.net – Edit CSS, JavaScript, HTML and run it (big sandbox)
• Testing with different IE versions (Windows) (IETester: For slow machines) (Expression Web SuperPreview: For mordern machines)
• &withJS functionality: Commons has per-page JavaScript functionality, via this code being included in MediaWiki:Common.js. Try a random image file with MediaWiki:VisualFileChange.js.
• Testing the API

Validating and styling

• Commons:User scripts/reports
• Use MediaWiki:Gadgetprototype.js for new gadgets.
• ESLint – JavaScript Code Quality Tool (former jshint)
• jslint – another JavaScript Code Quality Tool
• jsbeautifier – Indenting and formatting your script – also on Commons:
• Commons Beautifier: escape unsafe characters and beautify the source code
• compactor- or just search yourself

Tools

• {{Scriptuse}}

Troubleshooting

• Commons Diagnostic: Let affected users make the test
• &debug=true – URL parameter to get un-minified code
• Debug AJAX requests (using mockjax) GitHub doc

Commons

• Commons:Gadgets

See also https://greasyfork.org/en/scripts/by-site/wikimedia.org