Query Wikidata REST API with related identifier - wikidata-api

Question

I am attempting to do alignments for a set of known VIAF IDs. I would like to query the Wikidata REST API with a VIAF ID (P214) and get back a set of one or more Wikidata entity IDs (QXXXXX) that correspond to that VIAF entity. I am unable to find any examples of this either in the Wikidata API documentation or otherwise online.
I've noodled around with various permutations of queries using action=wbsearchentities and action=query, all to no avail.
Could anyone kindly point me to set of docs or example code that enumerates the correct query parameters for such a search?

Answer 1

Let's suppose you want to find the item whose VIAF ID is "113230702" (i.e. Douglas Adams).
Solution 1
Use action=query:
https://www.wikidata.org/w/api.php?action=query&format=json&list=search&srsearch=haswbstatement:P214=113230702
URL response:
{"batchcomplete":"","query":{"searchinfo":{"totalhits":1},"search":[{"ns":0,"title":"Q42","pageid":138,"size":319024,"wordcount":1204,"snippet":"Douglas Adams\nDouglas Adams\n\u0414\u0443\u0433\u043b\u0430\u0441 \u0410\u0434\u0430\u043c\u0441\nDouglas Adams\nDouglas Adams\nDouglas Adams\nDouglas Adams\nDouglas Adams\nDouglas Adams\nDouglas Adams\nDouglas Adams","timestamp":"2021-08-13T22:04:39Z"}]}}
Solution 2
Use Wikidata Query Service:
https://query.wikidata.org/bigdata/namespace/wdq/sparql?format=json&query=SELECT%20DISTINCT%20%3Fx%0AWHERE%20{%0A%20%20%3Fx%20wdt%3AP214%20%22113230702%22%0A}
This last URL comes from the following SPARQL query:
SELECT DISTINCT ?x
WHERE {
?x wdt:P214 "113230702"
}
URL response:
{
"head" : {
"vars" : [ "x" ]
},
"results" : {
"bindings" : [ {
"x" : {
"type" : "uri",
"value" : "http://www.wikidata.org/entity/Q42"
}
} ]
}
}