async function fetchWithBearerToken(url, token) {
  try {
    const response = await fetch(url, {
      method: 'GET', // or 'POST', 'PUT', etc.
      headers: {
        'Authorization': `Bearer ${token}`,
        'Content-Type': 'application/json' // Adjust as needed
      }
    });

    if (!response.ok) {
      const errorData = await response.json().catch(() => ({ message: response.statusText }));
      throw new Error(`API error: ${response.status} - ${errorData.message}`);
    }

    return await response.json();
  } catch (error) {
    console.error('Failed to fetch data:', error);
    throw error;
  }
}

// Example usage:
// const myToken = 'your_jwt_or_oauth_token';
// fetchWithBearerToken('https://api.example.com/data', myToken)
//   .then(data => console.log('Fetched data:', data))
//   .catch(err => console.error('Error in example usage:', err));