Zotero author lookup in lobid API and enhance with GND ids

zotero-author-lobid-lookup.js

// WHAT: for each selected item, go through all creators and look each of them up in lobid GND API
//       if any differentiated persons are found, then update this information about possible
//       GND machtes in the extra field (proof-of-concept)
// HOW:  can be run within Zotero "Run Javascript" tool

var items = Zotero.getActiveZoteroPane().getSelectedItems();
var apiCall = "https://lobid.org/gnd/search?q=";
var suffix = "&filter=type:DifferentiatedPerson&format=json";

for (let item of items) {
   var creators = item.getCreators();
   for (let creator of creators) {
      let query = [creator.firstName, creator.lastName].join(" ").replace(/ /g, "+");
      await Zotero.HTTP.doGet(apiCall + query + suffix, function (obj) {
         data = JSON.parse(obj.responseText);
         if (data.totalItems > 0) {
            let ids = data.member.map(x => x.id).join(", ");
            let extra = item.getField("extra");
            item.setField("extra", extra + "\n" + creator.lastName + " = " + ids + " ?");
            note += ids;
         }
      });
      
   }
}

return items;