LWCIntermediateerrorsresilience
Design LWC error boundary and fallback UI
Real World Scenario
One LWC JavaScript error crashes entire Lightning record page flexipage region.
Expected Answer
• errorCallback implementation logging and user fallback message
• Graceful degradation partial UI not blank white screen
• Try-catch around imperative logic with user toast
• Isolate risky third-party in child component limiting blast radius
• Central error logging service correlation
• Admin notification on repeated component errors
• Test error paths deliberately in QA
Follow-Up Questions & Answers
Click to expand — each follow-up includes a direct, interview-ready answer
Main difference: use case and scale. errorCallback implementation logging and user fallback message. Graceful degradation partial UI not blank white screen. Pick based on your integration pattern and team capability. Component isolation limits page-level failures—invest in errorCallback for complex LWCs. Balance speed of delivery with maintainability.
Architect Perspective
Component isolation limits page-level failures—invest in errorCallback for complex LWCs.