Do I need to serialize or sanitize data sent using jQuery's post function?

Do I need to serialize or sanitize data sent using jQuery's post function?

var name = "abc "xyz"? 1&2&3,555";
var contact = "abc "xyz"? 1&2&3,555";

 $.post('save.php', { filename: name, content: html },
  function(data) {
    alert(data);
  }, 
  'text'
 );

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