GMail Auto Archive script for Google Scripts

gmail-auto-archive.js

function gmailAutoarchive() {
  var threads = GmailApp.search("in:inbox label:auto-archive older_than:2d");
  
  Logger.log("found " + threads.length + " threads:");
  for(var i = 0; i < threads.length; i++) {
   var thread = threads[i];
   Logger.log((i+1) + ". " + thread.getFirstMessageSubject());
  }
  
  var batch_size = 100;
  while (threads.length) {
    var this_batch_size = Math.min(threads.length, batch_size);
    var this_batch = threads.splice(0, this_batch_size);
    
    GmailApp.moveThreadsToArchive(this_batch);
  }
}

Hi @felciano! I suggest you start with Google Apps Script Quickstart and just replace the sample script with this one. I think the key point here is to Enable the Gmail API advanced service.

Just tried it from another Google account and it prompted for authorization automatically during manual run. Subsequent runs just work.