la_bot_back/resources/main/js/tg.js

document.addEventListener("DOMContentLoaded", () => {
    let tg = window.Telegram.WebAppUser;
    let username_tag = document.getElementById("username_tag")
    let user_id_tag = document.getElementById("user_id_tag")
    username_tag.innerHTML = tg.initDataUnsafe.user.username;
    user_id_tag.innerHTML = tg.initDataUnsafe.receiver.id;

    console.log(tg.initDataUnsafe.user)
});