Search by keyword sample for the YouTube API for Google Apps Script.

searchByKeyword.gs

function searchByKeyword() {
  var results = YouTube.Search.list("id,snippet", 
                   {q : "google apps script", maxResults: 25});
  
  for(var i in results.items) {
    var item = results.items[i];
    Logger.log("[%s] Title: %s", item.id.videoId, item.snippet.title);
  }
}