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[FEATURE] Implement global error boundary & standardized API error handling #131

Description

@KumarManglam-123

🚀 Feature Description

Implement a centralized error-handling system across the application, including a React Error Boundary on the frontend and standardized API error responses on the backend services (Express and FastAPI).

💡 Problem Statement

Currently, the application lacks a unified way to handle runtime UI crashes and inconsistent backend error responses.
This leads to:

Poor user experience during failures

Unclear or missing error messages

Difficult debugging and maintenance

What problem does this feature solve? Is your feature request related to a problem?

📋 Proposed Solution

Add a global React Error Boundary to catch component crashes and display a user-friendly fallback UI.
Implement toast/alert notifications for API request failures.
Standardize backend error responses across:
Express.js server
Express.js server
Standard response format example:
{
"success": false,
"message": "Error description",
"code": "ERROR_CODE"
}

🔄 Alternatives Considered

Handling errors individually in each component or route.
However, this approach is repetitive, inconsistent, and harder to maintain compared to a centralized solution.

Describe any alternative solutions or features you've considered.

📸 Mockups/Examples

If applicable, add mockups, wireframes, or examples from other applications.
Example behavior from modern apps:
Friendly “Something went wrong” fallback screen
Toast notification for API failures
Retry option for failed actions

🎯 Acceptance Criteria

  • Global React Error Boundary implemented
  • Friendly fallback UI displayed on runtime crash
  • Toast/alert shown for failed API requests
  • Standard JSON error format used in Express & FastAPI
  • Proper HTTP status codes returned
  • No regression in existing functionality

📎 Additional Context

Add any other context or screenshots about the feature request here.

🏷️ Component

This improvement will enhance stability, debugging, and production readiness of the Edulume platform while also improving overall user experience.

Which part of the application does this affect?

  • Frontend (React)
  • Backend (Express)
  • Python Backend (FastAPI)
  • Database
  • Documentation
  • Other

SWOC 2026 Participants: This could be a great contribution opportunity! Add the swoc2026 label if you'd like to work on this.

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