function like(id) {

    const usernameBox = document.getElementById('username');
    const passwordBox = document.getElementById('password');

    const formData = new FormData();
    formData.append('username', usernameBox.value);
    formData.append('password', passwordBox.value);
    formData.append('post', id);

    fetch('/like', {
      method: 'POST',
      body: formData
    });
}