Reeve Is your v0 app safe?
v0 turns a prompt into polished React and Next.js code, and can deploy it in a click. The output looks production-ready — but "looks ready" and "is safe" aren't the same thing, and the gaps don't show up in the preview.
Reeve checks the common ones from the outside, for free, and explains anything it finds in plain English. No install, no access to your accounts — only what's already public.
Paste your app's link. About 20 seconds. See your grade with no signup.
What can actually go wrong with a v0 app
None of these are your fault — they're the normal side-effects of generating code fast. Here's what's worth checking:
A secret key in a client component (the NEXT_PUBLIC_ trap)
v0 builds with Next.js, which has a rule that trips people up: anything named NEXT_PUBLIC_ — and any key written straight into a client component — gets sent to the browser, where anyone can read it. It's easy to paste an API key into a generated component without realising it's now public. Some keys are meant to be public; Reeve tells those apart from the ones that aren't, so no false alarms.
Your database left open (Supabase RLS off)
If your v0 app stores data — often in Supabase — there's a switch called Row Level Security (RLS) that decides who can read or change each row. If it's off, your tables can be open to anyone who finds the address. It's the most common serious issue in generated apps and stays invisible until you look.
Published source maps
A "source map" reveals your app's original code to anyone who opens the browser tools. It's helpful while building, but if it ships to production it hands strangers a readable copy of how your app works — and makes every other gap easier to find. Reeve checks whether yours are exposed.
Open API routes
Next.js apps often include API routes — small endpoints that do things like read or write data. If one was generated without an auth check, it may answer to anyone who calls it. Reeve probes whether your endpoints respond to strangers, without ever using them to change anything.
An exposed .env or config file
The .env file holds a project's keys. Occasionally it gets published with the deployed app by mistake, and if it's reachable it's a shortcut to everything sensitive. Reeve checks whether yours is quietly accessible.
Missing safety headers & open sharing (CORS)
Small settings that tell browsers how to protect visitors, and whether any website is allowed to call your app's data. Minor on their own; together they widen the gap. Reeve flags what's missing.
What Reeve is — and isn't
Reeve is a free, read-only check from the outside — like an inspector trying the doors, not stepping inside. It's fast and catches the common, high-impact mistakes. It is not a full security audit, and a clean grade isn't a guarantee — it means the obvious doors are shut.
v0 and Vercel keep raising the quality of what's generated and deployed, and if you use Supabase, its own advisor flags database issues in the dashboard. Both help. What Reeve adds: you're working in v0, not reading the generated code line by line, and those tools speak developer. Reeve looks at the whole deployed app from the outside and tells you what it finds in plain words. And if you'd rather not think about it, we can watch it for you.
Want it handled, not just checked?
Reeve Care keeps watching your app, backs up your data, and helps you fix things when they break — so you can keep building instead of worrying.
Learn about Reeve CareQuestions, answered honestly
Is v0 code production-ready and secure?
v0 produces clean, modern code, but "production-ready looking" isn't the same as "checked." Security depends on how the app is wired — where keys live, whether your database rules are on, whether endpoints are protected. Reeve checks the exposed parts free in about 20 seconds.
Can a v0 app expose my API keys?
Yes, if a key ends up in a client component or a NEXT_PUBLIC_ setting — Next.js sends those to the browser. Not every key is a problem: some are meant to be public. Reeve finds the keys in your loaded code and tells you which are safe and which need to move to the server.
Are v0 API routes safe?
They can be, but a generated endpoint sometimes ships without an authentication check, which means anyone who finds it can call it. Reeve tests whether your endpoints answer to strangers — it only checks that the door opens, it never walks through it.
Will scanning my v0 app break anything?
No. Reeve only looks at what's already public from the outside. It never logs in, never changes anything, and never downloads data — read-only, like checking whether a door is locked without going in.
Built somewhere else? We've got the same honest rundown for:
Automated external check, not a full audit. Absence of findings is not a guarantee of safety.