Erreur .each avec jquery

	$villes = get_villes($cpost);
	//print_r($villes);
   header('Content-Type: text/plain; charset=utf-8');
   $json = new \JSON();
   $villes = $json->encode($villes, false);
   die($villes);

			$.ajax({
			 type: "POST",
			 datatype:"json",
			 url: "<?php echo DIR_JS; ?>SCRIPTS/getvilles.php", //Relative or absolute path to response.php file
			 data: {cpost: cpost},
				success: function(villes){
					console.log(villes);
					$.each(villes, function(id, name ) {
					  console.log(id+" "+name);
					});
				}
			 });

	$villes = get_villes($cpost);
	json_encode($villes);
	print_r($villes);

<?php
/**
* Fonction de connexion à la BDD
*/
function connexion_bdd(){
 try{
    $db = new PDO('mysql:host='.DB_HOST.'; dbname='.DB_NAME.'; charset=utf8', DB_USER, DB_PASSWORD);
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
  } catch(PDOException $e) {
      die('Erreur : ' . $e->getMessage());
  }
  return $db;
}

function get_villes($cpost) {
  //connexion à la BDD
  $db = connexion_bdd();

  $query = "SELECT ville_id, ville_nom_reel FROM villes_france_free WHERE ville_code_postal LIKE '$cpost%'"; 
  //echo $query;
  $datas = array(':valeur1'=>$cpost);
  try{
    $requete = $db->prepare($query) ;
    $requete->execute($datas) ;
    $result = $requete->fetchAll(); //print_r($result);
  }catch(Exception $e){
    // en cas d'erreur :
     echo "<br>Erreur  dans la requete : ".$query . " !<br> ".$e->getMessage();
     echo "<br>Les datas : <br>" ;
     print_r($datas);
  }
  return !empty($result) ? $result : NULL;
}

$.ajax({
    type: "POST",
    dataType: 'json',
   url: "<?php echo DIR_JS; ?>SCRIPTS/getvilles.php", //Relative or absolute path to response.php file
    data: {cpost: cpost},
    success: function(reponse){
          $.each(reponse,function(i,ville){
            console.log(ville.ville_id + " => " + ville.ville_nom_reel);
           });
          
    }
        ,error : function(x,err){
         alert(err);
        }
    });

}

function get_cp($idville) {
  //connexion à la BDD
  $db = connexion_bdd();

  $query = "SELECT ville_code_postal FROM villes_france_free v 
  WHERE ville_id =$ville"; 

  $datas = array();
  try{
    $requete = $db->prepare($query) ;
    $requete->execute($datas) ;
    $result = $requete->fetchAll(); 
  }catch(Exception $e){
    // en cas d'erreur :
     echo "<br>Erreur  dans la requete : ".$query . " !<br> ".$e->getMessage();
     echo "<br>Les datas : <br>" ;
     print_r($datas);
  }
  //return !empty($result) ? $result : NULL;
  return ($result);
}

 $cpostal = get_cp($idville);
 header('Content-Type: application/json');
 echo json_encode($cpostal);

   $.ajax({
     type: "POST",
        dataType: 'json',
     url: "<?php echo DIR_JS; ?>SCRIPTS/getcp.php", //Relative or absolute path to response.php file
     data: {ville: ville},
     success: function(reponse){
      console.log("cp "+reponse);
      $(cpost).val=reponse;
     },
     error : function(x,err){
            alert(err);
           }
     });

ville 17026 
check ville 17026  
cp [object Object]