Fixing an AI-Generated Recipe Sharing App

A food blogger used v0.dev to build a recipe sharing platform where home cooks could save and organize their recipes. The prototype looked good, but once he deployed it, users reported recipes disappearing, the site breaking on mobile devices, and authentication issues - people were getting logged out randomly and some saw other users' private recipes. He needed to fix these critical bugs before launching to his Instagram followers.

I spent 2.5 weeks debugging and fixing the core issues:

Found that user authentication wasn't properly checking user IDs in database queries, causing recipe data to leak between users

Fixed all database queries to include proper user filtering using Prisma

Rewrote the auth logic using NextAuth.js to stop random logouts

Added input validation on forms (the AI-generated code had none)

Made the UI responsive for mobile using Tailwind CSS breakpoints

Added error handling so the app shows helpful messages instead of crashing

Fixed image uploads which were failing silently

Moved hardcoded API keys to environment variables

Added loading states throughout the app

Set up proper deployment on Vercel with environment configuration

Next.js, React, TypeScript, NextAuth.js, PostgreSQL, Prisma, Tailwind CSS, Vercel

Fixed the critical bug where users could see each other's private recipes

App now works properly on mobile (was completely broken before)

Zero crashes since the fixes were deployed

Authentication works reliably - no more random logouts

Client successfully launched to his audience

150+ users signed up in the first month with no major issues