Prisma 7 Configuration Guide

Prisma 7 introduces breaking changes from v6. The main change is that database connection configuration has moved from schema.prisma to prisma.config.ts.

Quick Start

1. Install Dependencies

bun add @prisma/client @prisma/adapter-pg pg dotenv
bun add -d prisma @types/pg

2. Create prisma.config.ts

Create prisma.config.ts in your Prisma package root (where prisma/ folder is):

import { config } from "dotenv";
import { defineConfig } from "prisma/config";
import path from "path";

// Load .env from appropriate location
config({ path: path.resolve(__dirname, "../../.env") });

export default defineConfig({
  earlyAccess: true,
  schema: "./prisma/schema.prisma",
  datasource: {
    url: process.env.DATABASE_URL!,
  },
  migrate: {
    adapter: async () => {
      const { Pool } = await import("pg");
      const { PrismaPg } = await import("@prisma/adapter-pg");
      const pool = new Pool({ connectionString: process.env.DATABASE_URL });
      return new PrismaPg(pool);
    },
  },
});

3. Update schema.prisma

Remove url from datasource block:

datasource db {
  provider = "postgresql"
}

generator client {
  provider = "prisma-client-js"
}

// Your models here...

4. Create Prisma Client with Adapter

import { config } from "dotenv";
import path from "path";

// Load .env from workspace root
config({ path: path.resolve(__dirname, "../../../.env") });

import { Pool } from "pg";
import { PrismaPg } from "@prisma/adapter-pg";
import { PrismaClient } from "@prisma/client";

// Create connection pool
const pool = new Pool({ connectionString: process.env.DATABASE_URL });
const adapter = new PrismaPg(pool);

// Prevent multiple instances during development
const globalForPrisma = globalThis as unknown as {
  prisma: PrismaClient | undefined;
};

export const prisma = globalForPrisma.prisma ?? new PrismaClient({ adapter });

if (process.env.NODE_ENV !== "production") {
  globalForPrisma.prisma = prisma;
}

export * from "@prisma/client";

Key Changes from Prisma 6

Prisma 6	Prisma 7
url = env("DATABASE_URL") in schema.prisma	datasource.url in prisma.config.ts
new PrismaClient()	new PrismaClient({ adapter })
Built-in database driver	Explicit driver adapter required
--schema flag for CLI	Config file auto-detected

Commands

# Generate Prisma client
prisma generate

# Push schema to database (no migration)
prisma db push

# Create migration
prisma migrate dev --name <name>

# Open Prisma Studio
prisma studio

Common Errors

"The datasource property url is no longer supported"

Remove url = env("DATABASE_URL") from your schema.prisma datasource block and add it to prisma.config.ts instead.

"The datasource.url property is required"

Ensure your prisma.config.ts has the datasource.url property set and that the .env file is being loaded correctly.

Connection errors in monorepo

When using workspaces, ensure the dotenv path resolves to the correct .env location:

config({ path: path.resolve(__dirname, "../../.env") }); // Adjust depth as needed

References

• Upgrade to Prisma 7 Guide
• Prisma Config Reference
• Driver Adapters