To update Created, Created By, Modified, Modified in SharePoint document library/list using Client Object Model -CSOM

The changes to the "Author" and "Editor" metadata are done under an user account with "site owner" privileges. That is the app pool's custom user account.


<script type="text/javascript" src="https://code.jquery.com/jquery-1.10.2.min.js"></script>
<script type="text/javascript">

// When the body is loaded, the onload event handler executes each function whose name is contained in this array.
_spBodyOnLoadFunctionNames.push("callCSOM");

function callCSOM()
{
    $("#Button1").click(function()
    {
        // Make sure the SharePoint script file 'sp.js' is loaded before your code runs.
        ExecuteOrDelayUntilScriptLoaded(updateUser, "sp.js");

    }); 
}

function updateUser()
{


var clientContext = new SP.ClientContext.get_current();
  var web = clientContext.get_web();

  var currentUser = web.ensureUser('User Name here');
  clientContext.load(web);
  clientContext.load(currentUser);
  
  clientContext.executeQueryAsync( 
    function () {
      // now you have the user id and correct login name, update author
      var userField = currentUser.get_id() + ";#" + currentUser.get_loginName();
      updateListItem(userField);
    //alert(currentUser.get_title());
     },
     function (sender, args) {
       console.log('Error retrieving user properties');
     }
  );

}
function updateListItem(userField) {
var siteUrl = 'https://sharepoint2013/sites/PnP';

    var clientContext = new SP.ClientContext(siteUrl);
    var oList = clientContext.get_web().get_lists().getByTitle('List/library Name');
    //Item ID
    var oListItem = oList.getItemById(4);
  
    //oListItem.set_item('TriageLookup', '');
    oListItem.set_item('Deleted', 'No');
  
    oListItem.set_item('Modified', '05-30-2019');
    oListItem.set_item('Editor', userField);

    oListItem.update();
    
    
    clientContext.executeQueryAsync( 
    function (sender, args) {
      alert('Item updated!');
    }, 
    function (sender, args) {
      alert('Request failed, Updating new list item');                  
    }
  );
}
</script>

<input id="Button1" type="button" value="Run Code"/>