OpenStreetMap (OSM) and Wikidata are linked by storing the QID for the Wikidata item in the wikidata tag of the OSM object. This API returns OSM objects that link to a given Wikidata item.
API URL: https://osm.wikidata.link/tagged/api/item/:qid
Replace :qid with the QID of the Wikidata item.
Say you want to find the OSM node that represents Reality Checkpoint (Q130177), a large cast-iron lamppost in Cambridge, England.
Request URL: https://osm.wikidata.link/tagged/api/item/Q130177
Response:
{
"osm": [
{
"id": 1780104614,
"tags": {
"HE_ref": "1268376",
"highway": "street_lamp",
"lamp_type": "electric",
"listed_status": "Grade II",
"name": "Reality Checkpoint",
"name:lt": "Realybės taškas",
"tourism": "attraction",
"website": "https://en.wikipedia.org/wiki/Reality_Checkpoint",
"wheelchair": "yes",
"wikidata": "Q130177"
},
"type": "node"
}
],
"wikidata": {
"qid": "Q130177"
}
}
Enter a Wikidata item QID to check which OSM objects are returned by the API.