Error Boundary
حد الخطأ (Error Boundary)
Definition
A React class component or Next.js error.tsx that catches JavaScript errors in child components and shows a fallback UI.
مكوّن React كلاسي أو error.tsx في Next.js يلتقط أخطاء JavaScript في المكونات الفرعية ويعرض واجهة مستخدم بديلة.
Why It Matters
Without error boundaries, a single component throwing during render crashes the entire page. The `error.tsx` and `not-found.tsx` files in 404Fault prevent blank screen failures.
بدون حدود الأخطاء، مكوّن واحد يرمي خطأ أثناء التصيير يُعطّل الصفحة بأكملها. ملفات `error.tsx` و`not-found.tsx` في 404Fault تمنع إخفاقات الشاشة البيضاء.
Full Definition
Example Usage
“// app/glossary/error.tsx — Next.js automatically uses this as an error boundary for the /glossary route”
“// app/glossary/error.tsx — Next.js يستخدم هذا تلقائيًا كحد خطأ لمسار /glossary”
AI Builder Tips
Avoid these mistakes when using Error Boundary:
Forgetting that error boundaries don't catch async errors — those need try/catch in useEffect or event handlers
Not providing a useful fallback UI — blank screens are worse than error messages
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Help me build a project using Error Boundary. Explain: 1. What is Error Boundary and why it matters 2. The core architecture and required tools 3. Step-by-step implementation plan 4. Common mistakes to avoid: Forgetting that error boundaries don't catch async errors — those need try/catch in useEffect or event handlers, Not providing a useful fallback UI — blank screens are worse than error messages 5. Best practices and production tips