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Getting Started

MongoDB Adapter




npm install @auth/mongodb-adapter mongodb

Environment Variables



import NextAuth from "next-auth"
import { MongoDBAdapter } from "@auth/mongodb-adapter"
import clientPromise from "./lib/db"
export const { handlers, auth, signIn, signOut } = NextAuth({
  adapter: MongoDBAdapter(clientPromise),

The MongoDB adapter does not handle connections automatically, so you will have to make sure that you pass the Adapter a MongoClient that is connected already.

Add the MongoDB client

// This approach is taken from
import { MongoClient, ServerApiVersion } from "mongodb"
if (!process.env.MONGODB_URI) {
  throw new Error('Invalid/Missing environment variable: "MONGODB_URI"')
const uri = process.env.MONGODB_URI
const options = {
  serverApi: {
    version: ServerApiVersion.v1,
    strict: true,
    deprecationErrors: true,
let client
let clientPromise: Promise<MongoClient>
if (process.env.NODE_ENV === "development") {
  // In development mode, use a global variable so that the value
  // is preserved across module reloads caused by HMR (Hot Module Replacement).
  let globalWithMongo = global as typeof globalThis & {
    _mongoClientPromise?: Promise<MongoClient>
  if (!globalWithMongo._mongoClientPromise) {
    client = new MongoClient(uri, options)
    globalWithMongo._mongoClientPromise = client.connect()
  clientPromise = globalWithMongo._mongoClientPromise
} else {
  // In production mode, it's best to not use a global variable.
  client = new MongoClient(uri, options)
  clientPromise = client.connect()
// Export a module-scoped MongoClient promise. By doing this in a
// separate module, the client can be shared across functions.
export default clientPromise
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