var formData = new FormData(); formData.append("input_protobuf_encoded", ""); var xhr = new XMLHttpRequest(); const token = JSON.parse(document.getElementById("profile_edit_config").readAttribute("data-profile-edit")).webapi_token; xhr.open("POST", "https://api.steampowered.com/IPlayerService/SetFavoriteBadge/v1?access_token=" + token); xhr.send(formData);