We get a specific kind of call every few weeks. A founder built something in v0, showed it to a friend or an investor, got a genuinely good reaction, and then tried to open it up to real users. That’s when v0 generated code in production starts to show its seams. The interface still looks sharp. Buttons still animate the way they should. But the app underneath has no memory, no rules, and no idea what to do when something goes wrong.
This isn’t a knock on v0. It’s very good at what it’s designed to do, which is turn a description or a screenshot into a polished React interface faster than any human could type it out. The problem is that founders often mistake the interface for the product. A UI is the part of the app people see. It is not the part that keeps their data safe, their business logic correct, or their app running at 2am when nobody’s watching.
What v0 actually hands you
v0 generates components. Genuinely excellent ones, built on Next.js and Tailwind, with sensible structure and accessible markup more often than not. If you ask for a dashboard, you’ll get a dashboard: cards, charts, a sidebar, maybe some skeleton loading states. It looks like an app because it renders like one.
What you don’t get, unless you ask very specifically and then wire it up yourself, is anything behind that interface. No database calls that persist real records. No authentication that actually checks who’s logged in. No server logic that validates what a user submits before it touches your system. The “data” in a fresh v0 project is usually hardcoded arrays sitting in the component file, standing in for what should eventually be a database query.
That’s a reasonable way to prototype. It’s a genuinely bad way to run a business, and we’ve seen founders launch to paying customers with exactly this setup still intact, because nothing in the tool ever forced them to notice the gap.
The missing pieces founders discover late
The pattern is consistent enough that we could set a watch by it. A founder ships their v0 app, gets some traffic, and within a week or two, one of these shows up:
A user submits a form with an empty required field, or a price with a negative sign in front of it, and the app accepts it without complaint because nothing on the server is checking. The record sits in the database, wrong, until someone notices by accident.
Two users try to sign up with the same email, and instead of a friendly “that account already exists” message, they get a broken page or a silent duplicate. Real authentication, the kind that hashes passwords, manages sessions properly, and handles edge cases like password resets, is almost never in the initial build. We’ve written before about how to add authentication to a vibe-coded app, and it’s consistently one of the first things founders ask us to bolt on once they realise the “login” screen was mostly for show.
Then there’s the moment an API call fails, maybe the third-party service is slow, maybe a network blip, and the app just sits there. No error message, no retry, no fallback state. The founder assumes the site is down. It isn’t. It’s just that nobody wrote code for what happens when something doesn’t go perfectly, because a demo never has bad network conditions on purpose.
None of these are exotic failures. They’re the ordinary friction of real usage, and they’re invisible until real users show up. We covered the broader version of this problem in why your vibe-coded app breaks in production, and v0 apps follow the pattern closely: everything holds together until it meets a stranger with an unpredictable browser and an unpredictable Tuesday.
The Next.js complexity hiding underneath
Here’s the part that catches non-technical founders off guard. v0 doesn’t generate something simple underneath the polish. It generates Next.js, which is a genuinely powerful framework with real architectural decisions baked into every file: server components versus client components, routing conventions, data fetching patterns, environment variable handling, build configuration.
A developer looking at a v0 export can usually tell within minutes whether the component tree makes sense, whether state is being handled sensibly, and whether the project is using server actions correctly or fighting against them. A non-technical founder can’t tell any of that, and honestly shouldn’t be expected to. But it means the “just paste it into production” plan skips over a framework that has strong opinions about how things should be wired together, and getting those wirings wrong tends to produce bugs that look completely unrelated to their actual cause. A form that “randomly” doesn’t submit is often a server/client component boundary issue, not a form issue at all.
This is the same complexity gap we described in our guide on turning vibe-coded software into production code. The tools got better at producing convincing output. They didn’t get better at making that output self-explanatory to the person who commissioned it.
Turning a v0 prototype into a product without starting over
The good news, and we mean this genuinely, is that a v0 prototype is usually a fine starting point. We rarely recommend throwing it out. The component structure is normally sound, the design system is normally coherent, and rebuilding all of that from scratch would waste the one part v0 actually got right.
What needs to happen instead is layering in the parts that were never there. That means a real database with proper schema and constraints, not an array in a file. It means server-side validation on every input that matters, so bad data gets rejected before it’s stored rather than cleaned up after the fact. It means authentication that’s actually secure, with sessions that expire and passwords that are hashed rather than assumed. And it means error handling on every network call, so a slow API produces a loading spinner and a retry option instead of a blank screen.
We usually start by auditing what’s already wired up versus what’s just visual scaffolding, because founders are often surprised to learn how much of their “working” app was never actually connected to anything. From there it’s a matter of prioritising: authentication and data validation first, since those are the things that cause real damage, then error states and edge cases once the core is solid.
The interface v0 built doesn’t need to change much through any of this. The point isn’t to redesign the app. It’s to give the thing that already looks like a product the plumbing to actually behave like one.
Got a beautiful v0 front end and nothing behind it? We can help. Free assessment on /contact.