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Fetch API

واجهة Fetch

Beginnerprogramming1 min read
fetchwindow.fetchbrowser fetchhttp fetchnative fetch
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Definition

The browser's built-in function for making HTTP requests, returning a Promise that resolves to the response.

الدالة المدمجة في المتصفح لإجراء طلبات HTTP، تُعيد Promise يُحَل بالاستجابة.

Why It Matters

Every client-side API call in 404Fault uses fetch. Understanding fetch, response.ok, and error handling is essential for building reliable data-fetching patterns.

كل استدعاء API من جانب العميل في 404Fault يستخدم fetch. فهم fetch وresponse.ok ومعالجة الأخطاء أساسي لبناء أنماط جلب بيانات موثوقة.

Full Definition

The Fetch API is the native browser (and Node.js 18+) way to make HTTP requests. `fetch(url)` returns a Promise<Response>. You must call `.json()` or `.text()` on the response to read the body. Next.js extends fetch with automatic caching and revalidation options. All 404Fault client-side API calls (bookmarks, learning sessions, KG data) use fetch.
Fetch API هي الطريقة الأصلية للمتصفح (و Node.js 18+) لإجراء طلبات HTTP. `fetch(url)` تُعيد Promise<Response>. يجب استدعاء `.json()` أو `.text()` على الاستجابة لقراءة المحتوى.

Example Usage

“const res = await fetch('/api/knowledge-graph/term/firebase', { headers: { Authorization: `Bearer ${token}` } }); if (!res.ok) throw new Error(); const data = await res.json();”

“const res = await fetch('/api/knowledge-graph/term/firebase', { headers: { Authorization: `Bearer ${token}` } }); if (!res.ok) throw new Error(); const data = await res.json();”

Knowledge Graph

AI Builder Tips

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Avoid these mistakes when using Fetch API:

1

Checking `res.json()` directly without first checking `res.ok` — a 404 or 500 still resolves the Promise

2

Forgetting to send Authorization header for protected routes

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Help me build a project using Fetch API.

Explain:
1. What is Fetch API and why it matters
2. The core architecture and required tools
3. Step-by-step implementation plan
4. Common mistakes to avoid: Checking `res.json()` directly without first checking `res.ok` — a 404 or 500 still resolves the Promise, Forgetting to send Authorization header for protected routes
5. Best practices and production tips

Official Resources

Official Documentation
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