function loadSettings(jsonText) {
  try {
    const settings = JSON.parse(jsonText);
    return {
      ok: true,
      theme: settings.theme,
      retries: settings.retries,
    };
  } catch (error) {
    if (!(error instanceof SyntaxError)) {
      throw error;
    }

    return {
      ok: false,
      error: `${error.name}: ${error.message}`,
      theme: "light",
      retries: 0,
    };
  }
}

const validSettings = loadSettings('{"theme":"dark","retries":3}');
console.log(`valid theme: ${validSettings.theme}`);
console.log(`valid retries: ${validSettings.retries}`);

const brokenSettings = loadSettings("{'theme':'dark'}");
console.log(`caught error: ${brokenSettings.error}`);
console.log(`fallback theme: ${brokenSettings.theme}`);
console.log("application still running");