var pmMessages = [];
var messages = document.querySelectorAll(".privateMessages .messages ul li");

messages.forEach(function(message) {
    var senderElement = message.querySelector(".top span:first-child");
    var dateElement = message.querySelector(".top span:last-child");
    var titleElement = message.querySelector(".bottom span[data-attr='title']");
    
    var sender = senderElement ? senderElement.innerText.trim() : "";
    var date = dateElement ? dateElement.innerText.trim() : "";
    var title = titleElement ? titleElement.innerText.trim() : "";
    
    pmMessages.push({
        "gonderen": sender,
        "tarih": date,
        "konu": title
    });
});

console.log(JSON.stringify(pmMessages, null, 2));