Error Handling Guide

// Complete Error Handling Example
class APIError extends Error {
  constructor(message, status, code) {
    super(message);
    this.status = status;
    this.code = code;
  }
}

async function handleAPICall() {
  try {
    const response = await fetch('/api/chat', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ /* ... */ })
    });
    
    if (!response.ok) {
      const error = await response.json();
      
      switch (response.status) {
        case 400:
          throw new APIError('Invalid request parameters', 400, error.code);
        case 401:
          throw new APIError('Authentication failed', 401, error.code);
        case 429:
          throw new APIError('Too many requests', 429, error.code);
        case 500:
          throw new APIError('Server error', 500, error.code);
        default:
          throw new APIError('Unknown error', response.status, error.code);
      }
    }
    
    return await response.json();
  } catch (error) {
    console.error('API call failed:', error);
    // Log errors, show user-friendly error messages, etc.
    throw error;
  }
}