Enhanced Error Handling System

Overview

This document describes the comprehensive error handling system implemented to provide users with clear, actionable error messages while maintaining security and consistency across the platform.

Key Features

1. Structured Error Responses

Standardized format across all backend endpoints
User-friendly messages instead of technical jargon
Contextual information (file sizes, format requirements, suggestions)
Security-safe (no stack traces or sensitive data exposed to users)

2. Error Codes and Categories

UPLOAD_FILE_TOO_LARGE - File exceeds size limits
UPLOAD_INVALID_FORMAT - Unsupported file format
UPLOAD_PROCESSING_FAILED - Server-side processing error
AUTHENTICATION_* - Auth-related errors
VALIDATION_* - Input validation errors
NETWORK_ERROR - Connectivity issues
INTERNAL_ERROR - Server errors

3. Enhanced User Experience

Clear error messages with specific details
Helpful suggestions for resolving issues
File size limits and format requirements shown
Consistent UI across all error scenarios
Dismissible errors with optional technical details

Implementation

Backend Changes

New Error Models (`backend/models/error.py`)

class StandardErrorResponse(BaseModel):
    error_code: ErrorCode
    user_message: str
    details: ErrorDetails | None = None
    request_id: str | None = None

Updated Upload Handlers (`backend/handlers/uploads.py`)

File validation now returns structured errors
Specific messages for image vs video uploads
File size and format details included

Example Error Response

{
  "error_code": "UPLOAD_FILE_TOO_LARGE",
  "user_message": "The image file is too large. Please choose a file smaller than 5MB.",
  "details": {
    "max_file_size": "5MB",
    "current_file_size": "8.2MB",
    "suggestions": [
      "Compress the image",
      "Use a different image format like WebP"
    ]
  }
}

Frontend Changes

New Error Types (`frontend/src/types/error.ts`)

Enhanced ApiRequestError class
Structured error response interfaces
Error severity levels for styling

Error Service (`frontend/src/services/errorService.ts`)

Centralized error parsing and handling
User-friendly message extraction
Context-aware error suggestions
Consistent logging

Error UI Components (`frontend/src/components/ErrorDisplay.tsx`)

ErrorDisplay - Main error component with details
ErrorToast - Auto-dismissing notifications
InlineError - Form field errors
Severity-based styling (info, warning, error, critical)

Updated Components

RichTextEditor: Shows specific upload errors with file details
Editor Page: Uses new error display components
API Client: Enhanced error parsing
Story Hooks: Improved error handling

Usage Examples

Upload Errors

When a user tries to upload a file that’s too large:

Before: Generic alert “Failed to upload image. Please try again.”

After: Detailed error message with:

Specific reason (file too large)
Current file size (8.2MB)
Maximum allowed size (5MB)
Helpful suggestions (compress image, use different format)

Form Validation

Field-specific error messages
Clear indication of what needs to be fixed
Consistent styling across all forms

Network Errors

Distinguish between connectivity issues and server errors
Appropriate retry suggestions
User-friendly descriptions

Benefits

Better User Experience
- Users understand what went wrong
- Clear guidance on how to fix issues
- No confusing technical messages
Improved Security
- No stack traces or sensitive data exposed
- Controlled error information disclosure
- Debug details only for development
Consistency
- Same error format across all endpoints
- Uniform styling and behavior
- Maintainable error handling
Developer Experience
- Easy to add new error types
- Centralized error handling logic
- Comprehensive logging for debugging

Testing

To test the error handling:

Upload Large File: Try uploading an image > 5MB or video > 100MB
Invalid Format: Upload unsupported file types
Network Issues: Test with poor connectivity
Authentication: Test with expired tokens

The system now provides specific, actionable error messages for each scenario.

Future Enhancements

Internationalization support
More granular error codes
Error analytics and monitoring
Progressive error disclosure
Contextual help links

Database Migrations Logging