MongoDB Adapter

Resources

MongoDB documentation

Setup

Installation

npm install @auth/mongodb-adapter mongodb

pnpm add @auth/mongodb-adapter mongodb

yarn add @auth/mongodb-adapter mongodb

bun add @auth/mongodb-adapter mongodb

Environment Variables

MONGODB_URI=

Configuration

./auth.ts

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

/src/routes/plugin@auth.ts

import { QwikAuth$ } from "@auth/qwik" import { MongoDBAdapter } from "@auth/mongodb-adapter" import client from "./lib/db"   export const { onRequest, useSession, useSignIn, useSignOut } = QwikAuth$(  () => ({  providers: [],  adapter: MongoDBAdapter(client),  }) )

./src/auth.ts

import { SvelteKitAuth } from "@auth/sveltekit" import { MongoDBAdapter } from "@auth/mongodb-adapter" import client from "./lib/db"   export const { handle, signIn, signOut } = SvelteKitAuth({  adapter: MongoDBAdapter(client), })

./src/routes/auth.route.ts

import { ExpressAuth } from "@auth/express" import { MongoDBAdapter } from "@auth/mongodb-adapter" import client from "./lib/db"   const app = express()   app.set("trust proxy", true) app.use(  "/auth/*",  ExpressAuth({  providers: [],  adapter: MongoDBAdapter(client),  }) )

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

lib/db.ts

// This approach is taken from https://github.com/vercel/next.js/tree/canary/examples/with-mongodb 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: 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 & {  _mongoClient?: MongoClient  }    if (!globalWithMongo._mongoClient) {  globalWithMongo._mongoClient = new MongoClient(uri, options)  }  client = globalWithMongo._mongoClient } else {  // In production mode, it's best to not use a global variable.  client = new MongoClient(uri, options) }   // Export a module-scoped MongoClient. By doing this in a // separate module, the client can be shared across functions. export default client

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