Quick Answer: Full-Stack Application Security#
HttpOnly; Secure; SameSite=Strict cookies (never in localStorage), parameterizing all database queries to eliminate SQL/NoSQL injection, enforcing cryptographic Content Security Policy (CSP) nonces against Cross-Site Scripting (XSS), and implementing Redis-backed sliding window rate limiters across all public API routes.
The 4 Most Dangerous Full-Stack Vulnerabilities#
At Rajput Bhavin Engineering, we conduct rigorous static and dynamic security audits across all applications to eliminate critical attack vectors:
┌─────────────────────────────────────────────────────────────┐
│ OWASP Top Vulnerability Defenses │
├─────────────────────┬───────────────────────────────────────┤
│ Attack Vector │ Production Defense Mechanism │
├─────────────────────┼───────────────────────────────────────┤
│ XSS Token Theft │ HttpOnly cookies & strict CSP nonces │
│ SQL / NoSQL Inj. │ Parameterized queries (Prisma/Drizzle)│
│ Broken Access (BOLA)│ PostgreSQL Row-Level Security (RLS) │
│ Brute Force / DDoS │ Redis Sliding-Window Rate Limiting │
└─────────────────────┴───────────────────────────────────────┘1. Authentication Security: JWT in localStorage vs HttpOnly Cookies#
Storing JSON Web Tokens (JWT) or session identifiers in the browser's localStorage or sessionStorage is a critical vulnerability: any Cross-Site Scripting (XSS) payload injected via a third-party npm package can steal the user's session in one line of code (localStorage.getItem('token')).
#Production Cookie Configuration in Next.js 15:
import { cookies } from 'next/headers';
export async function setSecureSessionCookie(sessionToken: string) {
const cookieStore = await cookies();
cookieStore.set('session_token', sessionToken, {
httpOnly: true, // Prevents JavaScript from reading the cookie
secure: process.env.NODE_ENV === 'production', // Transmitted only over HTTPS
sameSite: 'strict', // Blocks Cross-Site Request Forgery (CSRF)
path: '/',
maxAge: 60 * 60 * 24 * 7, // 7 days expiration
});
}2. Hardened Content Security Policy (CSP) with Nonces#
A strict Content Security Policy prevents browsers from executing unauthorized inline scripts or loading assets from rogue domains.
In Next.js 15, implement dynamic cryptographic nonces in middleware.ts:
import { NextRequest, NextResponse } from 'next/server';
export function middleware(request: NextRequest) {
const nonce = Buffer.from(crypto.randomUUID()).toString('base64');
const cspHeader = `
default-src 'self';
script-src 'self' 'nonce-${nonce}' 'strict-dynamic';
style-src 'self' 'unsafe-inline';
img-src 'self' blob: data: https:;
font-src 'self';
object-src 'none';
base-uri 'self';
form-action 'self';
frame-ancestors 'none';
upgrade-insecure-requests;
`.replace(/\s{2,}/g, ' ').trim();
const requestHeaders = new Headers(request.headers);
requestHeaders.set('x-nonce', nonce);
requestHeaders.set('Content-Security-Policy', cspHeader);
const response = NextResponse.next({
request: {
headers: requestHeaders,
},
});
response.headers.set('Content-Security-Policy', cspHeader);
return response;
}3. Database Injection Defense (SQL & NoSQL)#
Never concatenate user strings directly into SQL queries. Always use parameterized queries or type-safe ORMs:
// VULNERABLE: Direct string interpolation (SQL Injection)
// const users = await db.query(`SELECT * FROM users WHERE email = '${email}'`);
// SECURE: Parameterized Query using Prisma ORM
const user = await prisma.user.findUnique({
where: { email: validatedEmail },
select: { id: true, email: true, role: true }, // Never select passwordHash by default
});4. API Rate Limiting & Denial of Service (DoS) Defense#
Protect sensitive endpoints (such as /api/auth/login, /api/ai/stream, and /api/checkout) from brute force and automated scraping using Upstash Redis:
import { Ratelimit } from '@upstash/ratelimit';
import { Redis } from '@upstash/redis';
const ratelimit = new Ratelimit({
redis: Redis.fromEnv(),
limiter: Ratelimit.slidingWindow(5, '60 s'), // Max 5 login attempts per minute
analytics: true,
});5. Security & Compliance Checklist (DPDP & GDPR)#
Engineer Secure Enterprise Software with Rajput Bhavin#
Security is not an afterthought; it is the foundation of scalable software architecture.
- ✦Explore our Custom Enterprise Software Development
- ✦Discover our SaaS Development Practice
- ✦Schedule a Security & Architecture Audit with Rajput Bhavin today.