How will this php code be implemented on node.js?

Question

PHP

Good day, please help me translate this code into node.js:

<?php
$output ='';
if (isset($_POST['nameUser'])) {
  $name = $_POST['nameUser'];
  $output .= 'Здравствуйте, '.$name.'! ';
  if ($_SERVER['REMOTE_ADDR']) {
    $output .= 'Ваш IP адрес: '. $_SERVER['REMOTE_ADDR'];
  }
  else {
   $output .= 'Ваш IP адрес неизвестен.';
  }
  echo $output;
}