Error Handlers in Python
From the Flask cheat sheet · Error Handling · verified Jul 2026
Error Handlers
Catch and handle application errors
python
# Quick Reference
@app.errorhandler(404)
def not_found(error):
return jsonify({'error': 'Not found'}), 404
@app.errorhandler(Exception)
def handle_error(error):
return jsonify({'error': str(error)}), 500💡 Custom exceptions provide better error context
🔍 Log errors for debugging in production
⚡ Don't expose internal errors to users
📌 HTTPException covers all HTTP status codes
errorsexceptions