Function template_page_params_json 

fn template_page_params_json(
    error_html: &str,
    next_input: &str,
    login_action_path: &str,
    account_type_options_html: &str,
    no_email_access_html: &str,
    reset_post_path: &str,
    invite_email: &str,
    invite_path: &str,
    return_path: &str,
    invite_kind: &str,
    target_html: &str,
    form_action: &str,
) -> Option<String>

Performs template page params JSON.