Protecting web applications against OWASP Top 10 vulnerabilities. A guide to CSRF prevention, XSS escaping, rate limiting, and strict CSP headers.
# Enterprise Security Architecture for Modern Web Applications
Security must be designed into application architecture from day one. In this article, I discuss key security defensive mechanisms implemented across full-stack TypeScript projects.
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## Defense in Depth
1. **Strict Input Sanitization**: Validate every incoming payload at edge routes using Zod schemas before touch points reach the database.
2. **Content Security Policy (CSP)**: Restrict inline script execution and enforce strict origin directives.
3. **HTTP Strict Transport Security (HSTS)**: Mandate HTTPS with 2-year max-age header configurations.
```typescript
// Zod input validation
const ContactSchema = z.object({
email: z.string().email(),
message: z.string().max(2000),
});
```
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## Conclusion
Security is about defense in depth. Combining strong typing, Zod schema validation, secure headers, and strict authentication ensures enterprise resilience.