MikroORM

To use this Adapter, you need to install Mikro ORM, the driver that suits your database, and the separate @next-auth/mikro-orm-adapter package:

npm install next-auth @next-auth/mikro-orm-adapter @mikro-orm/core @mikro-orm/[YOUR DRIVER]

Configure Auth.js to use the MikroORM Adapter:

pages/api/auth/[...nextauth].ts

import NextAuth from "next-auth"
import { MikroOrmAdapter } from "@next-auth/mikro-orm-adapter"

export default NextAuth({
  adapter: MikroOrmAdapter({
    // MikroORM options object. Ref: https://mikro-orm.io/docs/next/configuration#driver
    dbName: "./db.sqlite",
    type: "sqlite",
    debug: process.env.DEBUG === "true" || process.env.DEBUG?.includes("db"),
  }),
  providers: [],
})

Setup

Passing custom entities

The MikroORM adapter ships with its own set of entities. If you'd like to extend them, you can optionally pass them to the adapter.

This schema is adapted for use in MikroORM and based upon our main schema

pages/api/auth/[...nextauth].ts

import config from "config/mikro-orm.ts"
import {
  Cascade,
  Collection,
  Entity,
  OneToMany,
  PrimaryKey,
  Property,
  Unique,
} from "@mikro-orm/core"
import { defaultEntities } from "@next-auth/mikro-orm-adapter"

const { Account, Session } = defaultEntities

@Entity()
export class User implements defaultEntities.User {
  @PrimaryKey()
  id: string = randomUUID()

  @Property({ nullable: true })
  name?: string

  @Property({ nullable: true })
  @Unique()
  email?: string

  @Property({ type: "Date", nullable: true })
  emailVerified: Date | null = null

  @Property({ nullable: true })
  image?: string

  @OneToMany({
    entity: () => Session,
    mappedBy: (session) => session.user,
    hidden: true,
    orphanRemoval: true,
    cascade: [Cascade.ALL],
  })
  sessions = new Collection<Session>(this)

  @OneToMany({
    entity: () => Account,
    mappedBy: (account) => account.user,
    hidden: true,
    orphanRemoval: true,
    cascade: [Cascade.ALL],
  })
  accounts = new Collection<Account>(this)

  @Enum({ hidden: true })
  role = "ADMIN"
}

export default NextAuth({
  adapter: MikroOrmAdapter(config, { entities: { User } }),
})

Including the default entities in your MikroORM config

You may want to include the defaultEntities in your MikroORM configuration to include them in Migrations etc.

To achieve that include them in your "entities" array:

config/mikro-orm.ts

import { Options } from "@mikro-orm/core";
import { defaultEntities } from "@next-auth/mikro-orm-adapter"

const config: Options = {
  ...
  entities: [VeryImportantEntity, ...Object.values(defaultEntities)],
};

export default config;