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Version: v4


This is the Firebase (Firestore) Adapter for next-auth. This package can only be used in conjunction with the primary next-auth package. It is not a standalone package.

Getting Started

  1. Install the necessary packages
npm install next-auth @next-auth/firebase-adapter
  1. Add this adapter to your pages/api/auth/[...nextauth].js next-auth configuration object.
import NextAuth from "next-auth"
import GoogleProvider from "next-auth/providers/google"
import { FirestoreAdapter } from "@next-auth/firebase-adapter"

// For more information on each option (and a full list of options) go to
export default NextAuth({
providers: [
clientId: process.env.GOOGLE_ID,
clientSecret: process.env.GOOGLE_SECRET,
adapter: FirestoreAdapter({
apiKey: process.env.FIREBASE_API_KEY,
appId: process.env.FIREBASE_APP_ID,
authDomain: process.env.FIREBASE_AUTH_DOMAIN,
databaseURL: process.env.FIREBASE_DATABASE_URL,
projectId: process.env.FIREBASE_PROJECT_ID,
storageBucket: process.env.FIREBASE_STORAGE_BUCKET,
messagingSenderId: process.env.FIREBASE_MESSAGING_SENDER_ID,
// Optional emulator config (see below for options)
emulator: {},
// ...


When initializing the firestore adapter, you must pass in the firebase config object with the details from your project. More details on how to obtain that config object can be found here.

An example firebase config looks like this:

const firebaseConfig = {
apiKey: "AIzaSyDOCAbC123dEf456GhI789jKl01-MnO",
authDomain: "",
databaseURL: "",
projectId: "myapp-project-123",
storageBucket: "",
messagingSenderId: "65211879809",
appId: "1:65211879909:web:3ae38ef1cdcb2e01fe5f0c",
measurementId: "G-8GSGZQ44ST",

See for more details.

You can optionally pass in emulator options to automatically connect to your local Firebase emulator.

// ...
// Passing in an enable object will enable the emulator
emulator: {
// Optional host, defaults to `localhost`
host: 'localhost',
// Optional port, defaults to `3001`
port: 3001,
From Firebase

Caution: We do not recommend manually modifying an app's Firebase config file or object. If you initialize an app with invalid or missing values for any of these required "Firebase options", then your end users may experience serious issues.

For open source projects, we generally do not recommend including the app's Firebase config file or object in source control because, in most cases, your users should create their own Firebase projects and point their apps to their own Firebase resources (via their own Firebase config file or object).