Batch edit Zotero 5 items

zotero_batch.js

//Make batch changes to selected items in Zotero. Paste this into Tools -> Developer -> Run JavaScript.
async function batch_edit(field, value)
{
  var zp = Zotero.getActiveZoteroPane();  //Active Zotero window
  var selected = zp.getSelectedItems();   //Get the items that are selected
  for(const item of selected)
  {
    item.setField(field, value);
    await item.saveTx();
  }
}

//To check out the fields you can change, uncomment:
//return Zotero.getActiveZoteroPane().getSelectedItems()[0];

//Now run, for example:
await batch_edit("date", "1957");
return "Finished";  //This just prints "Finished" in the output window so you know it's done