Hack it.
Fix it.
Ship it.
FrontGuard lets you trigger real frontend security exploits in a safe sandbox — then see exactly how to fix them. Built for developers who learn by doing.
Vulnerable implementations. Real exploits. No restrictions.
Fixed implementations. See exactly what the patch looks like.
What you'll learn
5 Security Modules
Each module has a live exploit, a secure fix, and real-world context. Toggle between modes with one click.
XSS Playground
Inject real payloads. Watch them execute.
Auth Simulation
localStorage vs httpOnly cookies.
API Security
No-auth endpoints. Rate limit bypass.
RBAC Demo
Bypass frontend-only role checks.
DevTools Bypass
Edit the DOM. Change prices. Unlock features.
Why this matters
Real Breaches. Real Damage.
These aren't theoretical. Every vulnerability in FrontGuard has caused real-world incidents.
1M profiles infected in 20 hours via self-propagating XSS payload
500K customers' payment details stolen in real-time via JS skimmer
700M user records extracted through an unauthenticated API endpoint
533M records exposed via an API with no rate limiting on phone lookups
Private user data publicly accessible with zero authentication required
How it works
Three steps to understanding security
Attack
Switch to Attack Mode and trigger a real exploit. See what an attacker sees.
Observe
Watch the security log. See exactly what happened — token stolen, script executed.
Fix
Switch to Secure Mode. See the exact code change that neutralizes the attack.
Ready to break things?
No login. No setup. Just open the app and start exploring the most common ways frontend apps get compromised.
Launch FrontGuard