Hub

This is a Web hub: it let's you craft URLs to go from an origin to a destination on the web, at the condition that you provide enough information on those points to be identified within Wikidata. It works primarly around Wikimedia sites, but given the amount Wikidata knows about the web at large, it can get you pretty far! And if you don't know where you want to go, that's ok too: this will just bring you to the closest Wikipedia article.

Target audience:

A few examples to catch your interest:

we can now link to Wikipedia articles about a concept in the user's favorite language:

but, after choosing your starting point, you can also customize your destination:

for your next prototype, illustrate your concepts the lazy way:

image src
avatar example /Q42262?property=avatar&width=128
image example /frwiki:Laniakea?property=image&width=256

Summary

User Guide

Every URL is built as a bridge between two points, an origin and a destination:

The separation between the origin and the destination is expressed in the URL by the ?: everything before the ? aims to identify the origin, everything after identifies the destination.

Example:

Origin

Wikidata id

As the real hub in this story is Wikidata, every request needs to first resolve to a Wikidata id, which can thus be considered the primary origin point:

request redirection
/Q1 https://en.wikipedia.org/wiki/Universe
/Q2 https://en.wikipedia.org/wiki/Earth
...
/Q1388426 https://en.wikipedia.org/wiki/Bo%C3%ABn-sur-Lignon

Wikipedia and other Wikimedia Project

Alternatively to a Wikidata id, you can pass a key built from sitelinks as starting point, defaulting to enwiki.

request redirection
/frwikivoyage:Allemagne https://en.wikipedia.org/wiki/Germany
/eswikinews:Categoría:Alemania https://en.wikipedia.org/wiki/Germany
/ocwiki:Alemanha?lang=de https://de.wikipedia.org/wiki/Deutschland
/ocwiki:Alemanha?lang=el,fa&site=wikivoyage https://el.wikivoyage.org/wiki/%CE%93%CE%B5%CF%81%CE%BC%CE%B1%CE%BD%CE%AF%CE%B1
/enwiki:Edward_Snowden?property=P2002 https://twitter.com/Snowden
/enwiki:DIY?site=wikidata https://www.wikidata.org/wiki/Q26384
/DIY?site=wikidata https://www.wikidata.org/wiki/Q26384

External Ids

request redirection
/P214:24597135 https://en.wikipedia.org/wiki/Isaac_Asimov
/viaf:24597135 https://en.wikipedia.org/wiki/Isaac_Asimov
/twitter:doctorow https://en.wikipedia.org/wiki/Cory_Doctorow

Destination

Default

By default, the destination is Wikipedia in the user language, which is guessed from the request accept-language header, falling back to English if the language header can't be found or the Wikipedia page doesn't exist in this language.

request redirection
/Q184226 https://en.wikipedia.org/wiki/Gilles_Deleuze

Wikimedia Projects

lang

Pass a lang parameter (or just l) to override the accept-language header. Pass several values to set the fallback chain.

request redirection
/Q184226?lang=fr https://fr.wikipedia.org/wiki/Gilles_Deleuze
/Q184226?lang=als,oc,fr,en&site=wikiquote https://oc.wikipedia.org/wiki/Gilles_Deleuze
site

Pass a site parameter (or just s) to redirect to another site than wikipedia. Pass several values to set the fallback chain. When combined with a lang fallback chain, the site fallback has priority.

request redirection
/Q184226?site=wikiquote https://en.wikiquote.org/wiki/Gilles_Deleuze
/Q184226?site=wikivoyage https://en.wikipedia.org/wiki/Gilles_Deleuze
/Q184226?site=wikivoyage,wikiquote https://en.wikiquote.org/wiki/Gilles_Deleuze
/Q184226?site=wikiquote&lang=fr https://fr.wikiquote.org/wiki/Gilles_Deleuze
/Q184226?site=wikivoyage,wikiquote,wikipedia&lang=als,oc,fr,en https://fr.wikiquote.org/wiki/Gilles_Deleuze

This can also include sites that can build URLs from Wikidata ids:

request redirection
/Q23936146?site=crotos http://zone47.com/crotos/?q=Q23936146
/Q184226?site=inventaire https://inventaire.io/entity/wd:Q184226
/Q638519?site=monumental https://tools.wmflabs.org/monumental/#/object/Q638519
/Q184226?site=portal https://tools.wmflabs.org/portal/Q184226
/Q184226?site=reasonator https://tools.wmflabs.org/reasonator/?q=Q184226
/Q184226?site=scholia https://tools.wmflabs.org/scholia/Q184226
/Q184226?site=sqid https://tools.wmflabs.org//sqid/#/view?id=Q184226

short site names

You can use short versions of those sites names:

long short
wikidata wd
wikipedia wp
commons c
wikisource ws
wikiquote wq
wiktionary wt
wikivoyage wv
wikiversity wy
wikinews wn
inventaire inv
portal po
reasonator re
scholia sc
sqid sq

Example: /Q184226?s=wq,wp,inv,wd&l=fr,en,de

Following a claim

Pass a property parameter (or just p) to get the destination from the entity claims associated to the desired property. The following examples illustrate the different behaviors depending on the property type:

request redirection
Url
/Q21980377?property=P856 https://sci-hub.tw
/Q1103345?property=P953 http://www.cluetrain.com/#manifesto
/Q756100?property=P1324 https://github.com/nodejs/node
/Q132790?property=P4238,P856 http://www.biarritz.fr/webcam_2.html
ExternalId
/Q34981?property=P1938 https://www.gutenberg.org/ebooks/author/35316
/Q624023?property=P2002,P2003 https://twitter.com/EFF
WikibaseItem
/Q155?property=P38 https://en.wikipedia.org/wiki/Brazilian_real
CommonsMedia
/Q241?property=P242 https://commons.wikimedia.org/wiki/Special:FilePath/Cuba_(orthographic_projection).svg
/Q241?property=P242&width=1000 https://commons.wikimedia.org/wiki/Special:FilePath/Cuba_(orthographic_projection).svg?width=1000
GlobeCoordinate
/Q25373?property=P625 https://www.openstreetmap.org/?mlat=35.2542&mlon=-24.2585

Not supported: String, Time, Monolingualtext, Quantity, WikibaseProperty, Math

A w can be used for short for width.

properties bundles

Instead of a list of properties, you can use special bundle keys, that behave like a list of properties. The image and avatar bundles are designed to be a cheap way to give an image to an entity:

<img src="/Q624023?property=image,avatar&width=256" />
request redirection
/Q624023?property=image https://commons.wikimedia.org/wiki/Special:FilePath/EFF_Logo.svg
/Q624023?property=avatar https://avatars.io/twitter/EFF/
/Q624023?property=social https://twitter.com/EFF
/Q604319?property=social https://tools.wmflabs.org/wikidata-externalid-url/?p=4033&id=LaQuadrature@mamot.fr
/Q624023?property=image,avatar&width=120 https://commons.wikimedia.org/wiki/Special:FilePath/EFF_Logo.svg?width=120
/Q604319?property=avatar,image&width=256 https://avatars.io/twitter/laquadrature/large
/Q241?p=P242&w=1000 https://commons.wikimedia.org/wiki/Special:FilePath/Cuba_(orthographic_projection).svg?width=1000

JSON

You can get a JSON response (status code 200) instead of a redirection (status code 302) by adding the query parameter format=json. Ex: /Q184226?lang=fr&format=json This can be useful for debugging, or to use the internal resolver as a JSON API.

request response
/Q184226?lang=fr&format=json { origin: [Object], destination: [Object] }
/Q184226?l=fr&f=j { origin: [Object], destination: [Object] }

Query the Hub as a search engine

Building Hub URLs from the URL bar requires a few steps:

But we could be even more lazy by adding Hub as a search engine to your browser (see tutorials hereafter for firefox and chrome). The steps can now be as follow (assuming you set hub as search engine keyword):

Firefox

Chrome

Developer Guide

Dependencies

Install

git clone github.com/maxlath/hub
cd hub
npm install
# Starts the server on port 2580 and watch for files changes to restart
npm run watch

Deploy

The step followed to setup this tool on tools.wmflabs.org are documented here: deploy

See also

License

AGPL-3.0