Your v0 app looks done. Here is what it needs before real users arrive.

The build fails on Vercel

next build type-checks your TypeScript and stops on errors that the preview tolerated. Open the failed deployment in Vercel and read the build log. The useful error sits above the final "exited with 1" line. Run the same build on your machine and fix it at the source. Turning type checks off hides the problem until it shows up in front of a user.

npm install
npx next build

Features work in v0 but fail once deployed

Environment variables are set per environment: Development, Preview and Production. The v0 preview reads Development values, so a key you only added there works in the preview and fails once published. Add every variable the app reads for Production too, then publish again. Changing a variable does not update deployments that already exist.

A secret key is visible in the browser

In Next.js, any variable that starts with NEXT_PUBLIC_ is bundled into browser code. API keys for OpenAI, Stripe secret keys and database passwords must not have that prefix. Call those services from a Route Handler or Server Action so the key never leaves the server, then rotate any key that was exposed.

Images from another site don't load

The Next.js Image component only optimizes remote images from hosts you allow. Add the host to images.remotePatterns in next.config.

// next.config.ts
export default {
  images: {
    remotePatterns: [{ protocol: "https", hostname: "images.example.com" }],
  },
};

The data isn't real yet

Generated apps often start with sample arrays in the code so the screens look finished. Before launch, list every screen that reads data and confirm it reads from a real database, checks who is signed in, and handles empty and error states.

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