Edit in JSFiddle

const data = {
	"dcids": [
		"geoId/15",
		"geoId/02"
	],
	"placeType": "CongressionalDistrict"
}
const request = new XMLHttpRequest();
request.open("POST", "https://api.datacommons.org/node/places-in", false /* async */ );
request.send(JSON.stringify(data));

if (request.status == 200) {
  let payload = JSON.parse(request.responseText)["payload"];
  let result = JSON.parse(payload);
  console.log(result);
  
  for (let i = 0; i < result.length; i+=1) {
    let resultName = result[i]["place"];
    document.write(resultName + "<br>");
  }
  
  
} else {
  console.log("There was an error fetching data.");
}

Congressional Districts in Alaska and Hawaii: <br />