Add Comprehensive API Error Handling Documentation

readme.md

@@ -1 +1,101 @@
-test notes go here :)
+# Project Documentation
+
+## API Error Handling
+
+### Overview
+Our API uses standard HTTP status codes to indicate the success or failure of requests. Proper error handling is crucial for building robust integrations.
+
+### Error Response Structure
+All error responses follow a consistent JSON format:
+
+```json
+{
+  "error": {
+    "code": "ERROR_CODE",
+    "message": "Human-readable error description",
+    "details": "Optional additional error information"
+  }
+}
+```
+
+### HTTP Status Codes
+
+#### Client Error Codes (4xx)
+| Status Code | Description | Common Scenarios |
+|------------|-------------|-----------------|
+| 400 Bad Request | Invalid request syntax or parameters | Malformed request, missing required fields |
+| 401 Unauthorized | Authentication required or credentials invalid | Missing/invalid authentication token |
+| 403 Forbidden | Authenticated user lacks permission | Insufficient access rights |
+| 404 Not Found | Requested resource does not exist | Non-existent endpoint or resource |
+| 422 Unprocessable Entity | Validation error | Data format issues, semantic errors |
+
+#### Server Error Codes (5xx)
+| Status Code | Description | Recommended Action |
+|------------|-------------|---------------------|
+| 500 Internal Server Error | Unexpected server-side error | Retry request, contact support if persistent |
+| 503 Service Unavailable | Temporary server overload or maintenance | Implement exponential backoff, retry later |
+
+### Error Handling Best Practices
+
+1. **Always Check Status Codes**
+   ```javascript
+   async function apiRequest() {
+     try {
+       const response = await fetch('/api/endpoint');
+
+       if (!response.ok) {
+         const errorBody = await response.json();
+         throw new Error(errorBody.error.message);
+       }
+
+       return await response.json();
+     } catch (error) {
+       // Log or handle specific error scenarios
+       console.error('API Error:', error.message);
+     }
+   }
+   ```
+
+2. **Common Error Handling Strategies**
+   - Log detailed error information
+   - Provide user-friendly error messages
+   - Implement retry mechanisms for transient errors
+   - Use appropriate error boundaries in UI
+
+### Example Error Scenarios
+
+#### Authentication Error
+```json
+{
+  "error": {
+    "code": "UNAUTHORIZED",
+    "message": "Invalid authentication token",
+    "details": "Token has expired or is invalid"
+  }
+}
+```
+
+#### Validation Error
+```json
+{
+  "error": {
+    "code": "VALIDATION_ERROR",
+    "message": "Invalid input data",
+    "details": {
+      "field": "email",
+      "reason": "Invalid email format"
+    }
+  }
+}
+```
+
+### Recommended Error Monitoring
+- Implement client-side error logging
+- Use error tracking services
+- Set up alerts for critical error rates
+
+### Troubleshooting
+- Check network connectivity
+- Verify authentication credentials
+- Ensure request parameters are correctly formatted
+- Consult API documentation for specific endpoint requirements