Security for apps built with v0
v0 generates polished React and Next.js interfaces from a prompt. What it does not generate is the security of the backend you connect it to. Start with a free snapshot of your external surface, then mind the gaps v0 leaves to you.
A great front-end is only half the app
v0 is excellent at the interface. But security mostly lives in the parts it does not produce for you: how your API decides who can see what, how secrets are handled, and whether the app ships with the standard hardening. A beautiful UI can sit on top of an API that returns anyone's data.
The outside view can’t see this
Keys in the browser and an unguarded API
Two things catch people out with v0-generated apps: an API key or token left in client-side code where anyone can read it, and a backend endpoint that returns data without properly checking who is asking. Neither is visible from a passive external scan, they are in your bundle and your server logic, so they need a direct look.
What the free Surface Check covers for your v0 app
- HTTPS and HSTS on your custom domain, so traffic can't be silently downgraded to plain HTTP.
- Security headers (Content-Security-Policy, clickjacking protection, nosniff) on your front-end.
- Your TLS certificate's health and how soon it expires.
- Cookie flags (HttpOnly, Secure, SameSite) on any session or auth cookies you set.
- Email spoofing: SPF, DKIM and DMARC on your domain, so attackers can't send email as you.
See your external surface in about a minute
A free, passive snapshot with an A-to-F Surface Score and every issue scored by severity and fix effort. No sign-up, and nothing is stored.
Run the free Surface Check →Frequently asked
Does v0 make my app secure?
It makes your interface. Security depends on the backend, the API rules and the deployment, which are the parts you wire up around what v0 generates.
What is the most common issue with a v0 app?
An API key exposed in client-side code, and an endpoint that returns data without a proper ownership check. Both are inside your code, so the free external check flags your public surface, then the code needs a direct review.
Does the check read my code?
No. It is passive and external: it reads only what your domain shows the public internet. Reviewing code and testing access control is what a full Secvura review does.
Is it free?
Yes, free and with no sign-up, with an A-to-F Surface Score and every issue scored by severity and fix effort.
More free checks