v0 → an application, not a pile of components
v0 gave you a beautiful UI.
It never promised an application.
v0 is upfront about its scope: it generates components, not systems — no API routes, no database layer, no auth. The spaghetti starts when you promote those mockups into a product and server logic lands wherever it fits — inside components, in improvised server actions, in whichever file was open. useDeploy is the other half: a typed, tested backend that gives every piece of logic an address, so your v0 front-end stays as clean as the day it was generated.
Where v0 projects actually go wrong
v0's output is genuinely good — developers consistently describe the components as clean and well structured. The trap is the missing half: v0 generates UI components, not complete applications — no API routes, no database queries, no authentication logic. So when the mockup has to become a product, that logic gets written somewhere — and with no backend architecture to receive it, 'somewhere' means inside the components themselves: a fetch here, a permission check there, price math in a click handler. Iterating makes it worse: manual edits get overwritten by subsequent generations, and components that work against v0's preview break once wired to real data. The result isn't messy components. It's a beautiful front bolted to an app with no back — and every prompt spreads the load-bearing logic thinner across files that were designed to render, not to decide.
Symptoms of a v0 mockup promoted too fast
Display components making business decisions
Price math, permission checks, and fetches inline in what v0 designed as a presentational component. It renders beautifully and decides dangerously.
Every page fetches its own way
One screen uses a server action, another a route handler, a third talks to the database directly. Three data paths, zero shared validation.
Auth as a prop drilled through the tree
No session layer — just user objects passed down and checked ad hoc, differently, on every page that remembered to.
Regeneration eats your wiring
Re-prompt a component in v0 and the logic you hand-wired into it vanishes with the old markup — a familiar pain of iterating in place.
Preview-green, production-red
Everything works against v0's preview data, then breaks on real payloads — because nothing between UI and API validates what shape the data actually has.
The wall: a CI gate that catches payload drift
Typecheck alone can't save a UI-first codebase — your components can be perfectly typed against a payload the server never sends. useDeploy shares Zod schemas through @app/contracts, generates the client's types from the server's OpenAPI schema, and fails CI when they drift apart. It catches payload drift, not just type drift: the exact class of bug where the form compiles cleanly and the user gets a 400.
1 Running CI checks for PR #218…
2
3 ✓ typecheck passed
4 ✓ unit + integration (450+) passed
5 ✗ api-types-fresh FAILED
6
7 apps/client/lib/api/openapi-types.ts is stale.
8
9 client sends: { fullName: string }
10 server expects: { name: string }
11
12 Run `bun run generate:api` and commit the diff.
13 Merge blocked until server and client agree.
The back half, already built
A real API for your components to call
Six bounded contexts — iam, tenancy, billing, storage, ai, webhooks — expose typed HTTP endpoints your UI consumes through openapi-fetch. No component ever needs to improvise data access again.
One address per business rule
Each module splits into domain, application, infrastructure, and interface layers. Plan limits live in billing's domain — one place, guarded by lint, covered by tests.
Boundaries the build defends
ESLint flat-config bans express and @prisma/client imports from domain code. The layering survives every future generation because violations fail CI, not code review.
Payload drift caught in CI
The api-types-fresh gate regenerates client types from the server's OpenAPI schema and fails the PR if they differ — catching the drift typecheck alone can't see.
450+ tests, E2E gate, durable outbox
A regression suite and Playwright end-to-end checks gate every merge, and side effects flow through an outbox-backed event bus instead of hiding in handlers.
The migration path: v0 stays, the improvisation goes
Keep v0 in the loop — it's doing its job. The migration is about giving its output a real receiving structure. Drop your components into useDeploy's Next.js client; the React + Tailwind markup transfers as-is. Then rewire, screen by screen: strip the inline fetches and improvised server actions, and replace them with calls through the typed openapi-fetch client, whose schemas come from @app/contracts — the same Zod definitions the server validates against. The business decisions those components were carrying move into use cases inside the right module: plan limits into billing, invitations into tenancy, uploads into storage. From then on, regenerate UI in v0 as often as you like. The overwrite problem stops being dangerous, because components no longer carry logic — and the api-types-fresh gate guarantees a regenerated screen either compiles against the real API or fails in CI, never silently in production.
v0 questions, answered
Is v0 the problem?+
Will v0 components work with useDeploy's front-end?+
What happens to the server actions I've written?+
Can I keep iterating in v0 after the migration?+
One license. Two ways to own it.
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Your UI deserves a backend that keeps up
Drop your v0 components into a Next.js client wired to a typed, tested API — six bounded contexts, contract gates in CI, and one address for every piece of logic.