Use Prisma Postgres with Bun
Prisma needs Node.js to run certain generation code, so make sure Node.js is installed in the environment where you
run bunx prisma commands.
Create a new project
First, create a directory and initialize it with bun init.
$ mkdir prisma-postgres-app
$ cd prisma-postgres-app
$ bun initInstall Prisma dependencies
Then install the Prisma CLI (prisma), Prisma Client (@prisma/client), and the accelerate extension as dependencies.
$ bun add -d prisma
$ bun add @prisma/client @prisma/extension-accelerateInitialize Prisma with PostgreSQL
Use the Prisma CLI with bunx to initialize the schema and migration directory, with PostgreSQL as the database.
$ bunx --bun prisma init --dbThis creates a basic schema. Update it to use the Rust-free client optimized for Bun: open prisma/schema.prisma and modify the generator block, then add a User model.
generator client {
provider = "prisma-client"
output = "./generated"
engineType = "client"
runtime = "bun"
}
datasource db {
provider = "postgresql"
url = env("DATABASE_URL")
}
model User {
id Int @id @default(autoincrement())
email String @unique
name String?
} Configure database connection
Set up your Postgres database URL in the .env file.
DATABASE_URL="postgresql://username:password@localhost:5432/mydb?schema=public"Create and run database migration
Then generate and run the initial migration.
The command writes a .sql migration file to prisma/migrations and executes it against your Postgres database.
$ bunx --bun prisma migrate dev --name init
Environment variables loaded from .env
Prisma schema loaded from prisma/schema.prisma
Datasource "db": PostgreSQL database "mydb", schema "public" at "localhost:5432"
Applying migration `20250114141233_init`
The following migration(s) have been created and applied from new schema changes:
prisma/migrations/
└─ 20250114141233_init/
└─ migration.sql
Your database is now in sync with your schema.
✔ Generated Prisma Client (6.17.1) to ./generated in 18msGenerate Prisma Client
As the output shows, Prisma re-generates the Prisma client whenever you run a new migration. The client provides a fully typed API for reading and writing to the database. To re-generate the client manually, use the Prisma CLI.
$ bunx --bun prisma generateInitialize Prisma Client with Accelerate
Create a new file prisma/db.ts that initializes the PrismaClient with the Postgres adapter.
import { PrismaClient } from "./generated/client";
import { withAccelerate } from '@prisma/extension-accelerate'
export const prisma = new PrismaClient().$extends(withAccelerate())Create a test script
Write a script that creates a new user, then counts the users in the database.
import { prisma } from "./prisma/db";
// create a new user
await prisma.user.create({
data: {
name: "John Dough",
email: `john-${Math.random()}@example.com`,
},
});
// count the number of users
const count = await prisma.user.count();
console.log(`There are ${count} users in the database.`);Run and test the application
Run the script with bun run. Each run creates a new user.
$ bun run index.ts
There are 1 users in the database.$ bun run index.ts
There are 2 users in the database.$ bun run index.ts
There are 3 users in the database.Prisma Postgres is now set up with Bun. Refer to the official Prisma Postgres docs as you continue to develop your application.