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Input Validation

التحقق من صحة المدخلات (Input Validation)

Beginnersecurity1 min read
form validationdata validationsanitizationzodinput sanitizationschema validation
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Definition

Verifying that user-supplied data conforms to expected formats before processing it on the server.

التحقق من أن البيانات التي يُقدّمها المستخدم تتوافق مع التنسيقات المتوقعة قبل معالجتها على الخادم.

Why It Matters

Every 404Fault admin API route that accepts body data should validate it with Zod before writing to Firestore — prevents corrupted documents from bad inputs.

كل مسار API للمدير في 404Fault يقبل بيانات الجسم يجب أن يتحقق منها بـZod قبل الكتابة إلى Firestore — يمنع المستندات الفاسدة من المدخلات السيئة.

Full Definition

Input validation ensures that incoming data (from forms, API calls, URL parameters) matches expected types, lengths, and formats before being processed. Never trust client-side validation alone — always validate on the server. Zod is the standard TypeScript validation library: define a schema, parse the input, get typed results or an error. Prevents SQL injection, XSS, and corrupted database records.
التحقق من صحة المدخلات يضمن أن البيانات الواردة (من النماذج وطلبات API ومعامات URL) تطابق الأنواع والأطوال والتنسيقات المتوقعة قبل المعالجة. لا تثق أبدًا بالتحقق من جانب العميل وحده — تحقق دائمًا على الخادم. Zod هي مكتبة التحقق المعيارية لـTypeScript.

Example Usage

“import { z } from 'zod'; const schema = z.object({ slug: z.string().min(1).max(100), nameEn: z.string().min(1) }); const result = schema.safeParse(body); if (!result.success) return NextResponse.json({ error: result.error }, { status: 422 });”

“import { z } from 'zod'; const schema = z.object({ slug: z.string().min(1).max(100), nameEn: z.string().min(1) }); const result = schema.safeParse(body); if (!result.success) return NextResponse.json({ error: result.error }, { status: 422 });”

Knowledge Graph

AI Builder Tips

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Avoid these mistakes when using Input Validation:

1

Validating only on the client — JavaScript can be bypassed; always validate on server

2

Using type assertions instead of runtime validation: `data as MyType` doesn't validate at runtime

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Help me build a project using Input Validation.

Explain:
1. What is Input Validation and why it matters
2. The core architecture and required tools
3. Step-by-step implementation plan
4. Common mistakes to avoid: Validating only on the client — JavaScript can be bypassed; always validate on server, Using type assertions instead of runtime validation: `data as MyType` doesn't validate at runtime
5. Best practices and production tips

Official Resources

Official Documentation
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