Unable to connect to DB. Getting strange errors.

[vocal granite]

Hello all,

I installed prisma in my Next.js app for practice purpose. I installed prisma version 7 and also @prisma/client.
After that I created file src/lib/prisma.ts and wrote the attached code.

I also created a folder under src/products-db/page.tsx whrerein I wrote attached code to fetch the product list from the db and display it.

Now when I executed npm run dev, I got attached error.

Kindly help to resolve.

[kind jetty]

Hi @vocal granite. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

---

I'm sorry, but the knowledge sources you provided do not include the specific code you wrote in src/lib/prisma.ts or src/products-db/page.tsx, nor do they contain the exact error message you encountered. Without this information, I cannot give a precise diagnosis or solution.

However, I can share some common steps and best practices for setting up Prisma with Next.js, based on the official guides:

1. Prisma Client Setup
   Your lib/prisma.ts file should look like this:

   import { PrismaClient } from '@prisma/client';
   
   let prisma: PrismaClient;
   
   if (process.env.NODE_ENV === 'production') {
     prisma = new PrismaClient();
   } else {
     // @ts-ignore
     if (!global.prisma) {
       // @ts-ignore
       global.prisma = new PrismaClient();
     }
     // @ts-ignore
     prisma = global.prisma;
   }
   
   export default prisma;
   

   This ensures you don't create multiple PrismaClient instances in development, which can cause issues with hot reloading in Next.js How to Build a Fullstack App with Next.js, Prisma, and Postgres.

2. Database Connection
   Make sure your .env file contains the correct DATABASE_URL for your database. For example, for PostgreSQL:

   DATABASE_URL="postgresql://USER:PASSWORD@HOST:PORT/DATABASE?schema=public"
   

   For MySQL, the format is different. Double-check your connection string format according to your database type Fullstack Authentication Example with Next.js and NextAuth.js.

3. Prisma Client Generation
   After updating your schema, always run:

   npx prisma generate
   

   This ensures the Prisma Client matches your schema.

4. Common Errors
   • If you see errors about missing engines or libraries (e.g., libquery_engine-*.so.node), it may be due to bundling issues or missing dependencies, especially when using Turbopack or deploying to Vercel Incorrect bundling of dependencies.
   • If you get a "path argument must be of type string" error, check if you are using a custom output path in your Prisma generator block. Removing or correcting it may help [turbopack + prisma] TypeError: The "path" argument must be of type string. Received undefined.

Next Steps:

• Double-check your prisma.ts file and .env configuration.
• Make sure you have run npx prisma generate after any schema changes.
• If you are using Turbopack or a canary version of Next.js, consider switching to the stable version or using Webpack for development, as there are known issues with Prisma and Turbopack in some Next.js versions.
• If you can, provide the exact error message and relevant code for more targeted help.

If you share the specific error message and code, I can give more precise guidance!

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: