Prisma 7 Driver Adapters Explained

What Changed in Prisma 7?

Prisma 7 is a breaking release. The biggest change is that the Rust-based query engine is gone. Instead, Prisma now uses a TypeScript engine that runs inside Node.js — but it requires an explicit driver adapter to connect to your database.

What Is a Driver Adapter?

A driver adapter is a thin wrapper around a standard Node.js database driver (like pg for PostgreSQL) that translates between Prisma's internal query protocol and the driver's API. It replaces the old native binary.

Migrating a PostgreSQL Project

Install the adapter and the pg driver:

npm install @prisma/adapter-pg pg @types/pg

Then update your PrismaClient initialisation:

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

const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL! })
export const prisma = new PrismaClient({ adapter })

Updating prisma.config.ts

Prisma 7 also moves the datasource URL out of schema.prisma and into a prisma.config.ts file at the project root. This file is used by Prisma Migrate and other CLI commands.

Wrapping Up

The migration is straightforward once you understand what changed. The new architecture is more flexible — it allows Prisma to run in edge runtimes and serverless environments that could never run the old Rust binary.