Gift season! We have launched structured data on Commons, available from all wikis.

TLDR; One data store. Use everywhere. Upload table data to Commons, with localization, and use it to create wiki tables, lists, or use directly in graphs. Works for GeoJSON maps too. Must be licensed as CC0. Try this per-state GDP map demo, and select multiple years. More demos at the bottom.
US Map state highlight

Data can now be stored as *.tab and *.map pages in the data namespace on Commons. That data may contain localization, so a table cell could be in multiple languages. And that data is accessible from any wikis, by Lua scripts, Graphs, and Maps.

Lua lets you generate wiki tables from the data by filtering, converting, mixing, and formatting the raw data. Lua also lets you generate lists. Or any wiki markup.

Graphs can use both .tab and .map directly to visualize the data and let users interact with it. The GDP demo above uses a map from Commons, and colors each segment with the data based on a data table.

Kartographer (<maplink>/<mapframe>) can use the .map data as an extra layer on top of the base map. This way we can show endangered species' habitat.

== Demo ==
Raw data example
* Interactive Weather data
Same data in Weather template
* Interactive GDP map
Endangered Jemez Mountains salamander - habitat
* Population history
* Line chart

== Getting started ==
* Try creating a page at data:Sandbox/<user>.tab on Commons. Don't forget the .tab extension, or it won't work.
* Try using some data with the Line chart graph template
A thorough guide is needed, help is welcome!

== Documentation links ==
* Tabular help
* Map help
If you find a bug, create Phabricator ticket with #tabular-data tag, or comment on the documentation talk pages.

== FAQ ==
* Relation to Wikidata:  Wikidata is about "facts" (small pieces of information). Structured data is about "blobs" - large amounts of data like the historical weather or the outline of the state of New York.

== TODOs ==
* Add a nice "table editor" - editing JSON by hand is cruel. T134618
* "What links here" should track data usage across wikis. Will allow quicker auto-refresh of the pages too. T153966
* Support data redirects. T153598
* Mega epic: Support external data feeds.