Frontend Security
Security isn't just a backend concern. A compromised frontend can leak PII, steal sessions, and execute malicious scripts. Modern bootcamps often fail to teach basic OWASP Top 10 concepts for the client side.
Common Vulnerabilities
We see these mistakes repeatedly in bootcamp capstone projects:
- DOM-based XSS: Using
innerHTMLwith unsanitized user input. - Insecure Storage: Storing sensitive JWTs in
localStorageinstead of HTTP-only cookies. - Missing Security Headers: Failing to implement strict Content Security Policies (CSP).
The Real World Standard
1. Sanitize Everything: Never trust user input, even if it comes from your own API.
2. Principle of Least Privilege: Limit third-party script access.
3. Use Modern Defenses: Implement SameSite cookie attributes and CORS properly.
Interactive Tool: JWT Payload Decoder
Many developers treat JWTs as secure envelopes. They are not encrypted; they are only signed. Anyone can decode the payload. Test it below.
Decoded Payload
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