v0 code audits and Vercel app migrations
v0 is Vercel's AI UI generator for React and Next.js. It produces beautiful prototypes; turning them into production-ready code requires real engineering work.
Top issues we find auditing v0 apps
Patterns documented in primary-source security research, community forums, and real-world audits. These are the things that ship to production and break in front of users.
NEXT_PUBLIC_ used for actual secrets
v0's generated examples use the prefix indiscriminately, exposing values that should be server-only.
Environment variables not flagged 'Sensitive'
Vercel's April 2026 incident showed non-sensitive env vars are recoverable. v0 never sets the sensitive flag on values that need it.
Server Components accessing client-only APIs
Generated code throws ReferenceError: localStorage is not defined during SSR/SSG because v0 mixes client and server APIs without 'use client' boundaries.
The '90% problem'
Vercel's own writeups acknowledge it: code looks good, but lacks error boundaries, loading states, proper data fetching, and structured Suspense. Production-readiness requires a rewrite.
shadcn components customized non-standard
v0 outputs assume default shadcn implementations. Teams that customized Button, Dialog, or Form props see broken layouts and prop mismatches.
Missing Preview Deployment Protection
Every git push creates a public URL. Staging data and pre-release features become publicly indexable.
Supabase RLS skipped
Same pattern as Lovable and Bolt: tables created without policies. v0 forum threads show this as the dominant first-audit finding.
How we help v0 builders
Every engagement starts with a fixed quote. No retainer trap, no surprise invoices.
Security Review
Manual review of authentication, secrets, RLS, and integrations in your v0 app.
From $300
Code Audit
Full codebase review covering security, architecture, and performance for v0 projects.
From $450
Fix Bugs
Diagnose and fix the things your v0 AI broke. Single-shot or ongoing.
Custom quote
Migrate off v0
Move to your own infrastructure. Keep what works, rebuild what doesn't.
From $500
Retainer
Ongoing support, bug fixes, and code reviews. Cancel anytime.
From $250/mo
Cost & performance gotchas
- Generated apps default to Vercel's serverless functions, hitting cold-start tax on infrequent traffic.
- Image Optimization usage compounds quickly on free tier.
Thinking of leaving v0?
We migrate v0 apps to your own infrastructure starting at From $500. Keep the work, drop the lock-in.
- Self-hosted Next.js on Render or Railway
- Astro + Cloudflare Pages
- Next.js + Vercel (with proper SSR fixes)
Comparing v0 to other tools
Frequently asked questions
- Why does my v0 app crash with 'localStorage is not defined'?
- v0 mixes client and server APIs without proper 'use client' boundaries. Server Components can't access localStorage, window, or navigator. We fix the boundary errors and ship a production-ready SSR setup.
- Is v0 code production-ready?
- Vercel themselves call it the '90% problem': v0 generates code that looks good but lacks error boundaries, loading states, proper data fetching, and Suspense boundaries. Most v0 apps need a finishing pass before launch.
Ready to ship your v0 app with confidence?
Tell us about your app. Fixed quote within 24 hours.