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Using Firebase with Web3Auth Plug and Play No Modal SDK

web@web3auth/no-modalfirebasecustom authenticationreactethereumWeb3Auth Team | August 23, 2022

This guide will cover the basics of how to set up your Web3Auth SDK and Firebase for the integration and provide you with the links on how to develop a basic web application on the Ethereum blockchain.

Quick Start

npx degit Web3Auth/web3auth-pnp-examples/web-no-modal-sdk/custom-authentication/single-verifier-examples/firebase-no-modal-example w3a-firebase-demo && cd w3a-firebase-demo && npm install && npm run start

How it works?

When integrating Web3Auth with Firebase, the login flow looks something like this:

Web3Auth - Firebase Login Flow

  • When a user logs in with Firebase, Firebase sends a JWT id_token to the app. This JWT token is sent to the Web3Auth SDK's login function.

  • Finally, on successful validation of the JWT token, Web3Auth SDK will generate a private key for the user, in a self-custodial way, resulting in easy onboarding for your user to the application.


  • For Web Apps: A basic knowledge of JavaScript is required to use Web3Auth SDK.

  • For Mobile Apps: For the Web3Auth Mobile SDKs, you have a choice between iOS, Android, React Native & Flutter. Please refer to the Web3Auth SDK Reference for more information.

  • Create a Web3Auth account on the Web3Auth Dashboard

  • A Firebase account to be used as a Federated Identity Provider.

  • A Google Developer account to be used as an Identity provider for Firebase.


Setup Firebase

Create a Firebase Project
  • Create a new project by clicking on Add project or use your existing project from Firebase console.

    Firebase Project - Set up 1

  • Give your project a name and click on Continue

    Firebase Project - Set up 2

  • Finally, click on Create Project

    Firebase Project - Set up 3

Select Authentication Provider
  • Once the project is created. Set up authentication by clicking on the Authentication card from the home screen of your project or choose Authentication under Build from the left sidebar.

    Firebase Project - Set up auth 1

  • From the Sign-in method tab, select any provider you wish to enable. For this guide, we'll be enabling Google.

    Firebase Project - Set up auth 2

  • Finally, toggle the enable button and click on Save

    Firebase Project - Set up auth 3

Configure Firebase for Web
  • Once the project is created and authentication is configured. Let's use Firebase for Web by clicking on the </> button on the home screen of your project.

    Firebase Project - Set up web 1

  • In the next screen, enter the App nickname and click on the Register button to register the app for Web.

    Firebase Project - Set up web 2

  • The next screen shows ways to add Firebase to your application. We will be using the config from here later in the guide. Please keep a note of the firebaseConfig object.

    Firebase Project - Set up web 3

Setup Web3Auth

Setup Web3Auth Project

  • Create a Project from the Project Section of the Web3Auth Developer Dashboard.

    Plug n Play Project Creation on Web3Auth Dashboard

    • Enter your desired Project name.

    • Select the Product you want to use. For this guide, we'll be using the Plug n Play product.

    • Select the Platform type you want to use. For this guide, we'll be using the Web Application as the platform.

    • Select the Web3Auth Network as Sapphire Devnet. We recommend creating a project in the sapphire_devnet network during development. While moving to a production environment, make sure to convert your project to sapphire_mainnet or any of the legacy mainnet network mainnet, aqua, or cyan network. Otherwise, you'll end up losing users and keys.

    • Select the blockchain(s) you'll be building this project on. For interoperability with Torus Wallets, you have the option of allowing the user's private key to be used in other applications using Torus Wallets (EVM, Solana, XRPL & Casper).

    • Finally, once you create the project, you have the option to whitelist your URLs for the project. Please whitelist the domains where your project will be hosted.

      Plug n Play Project - Whitelist

Setup Firebase Custom Authentication Verifier

Create a Firebase Verifier from the Custom Authentication tab of your Web3Auth Project.

  • Click on the Custom Authentication tab of your Web3Auth Project.

  • Click on the Create Verifier button.

  • Enter a name of your choice for the verifier identifier. eg. w3a-firebase-demo

  • Select Custom Providers from the Choose a Login Provider section. Verifier Modal on Web3Auth Dashboard

  • JWKS Endpoint: Enter as the JWKS endpoint for the Firebase.

  • Now you have the option to paste a sample idToken(JWT) to get the fields for the JWT validation. This step is optional, but if you have a sample JWT you can paste it here to get the fields for the JWT validation. You can also skip this step and fill in the fields manually.

  • The following are the JWT validation fields needed for the Firebase JWT validation:

    • Type iss as a field and as a value.
    • Next, type aud as a field and FIREBASE-PROJECT-ID as a value.

    Note: Replace the FIREBASE-PROJECT-ID with your Firebase Project ID.

  • Next, Select Sub, Email or a Custom value from the dropdown for the JWT Verifier ID. This is the field that will be used as the verifier ID for the user, and it has to be unique for each user.

  • Finally, Click on the Create button to create your verifier.

Verifier Modal on Web3Auth Dashboard

It may take up to 10 minutes to deploy the verifier on sapphire_devnet. You'll receive an email once it's complete.

Using the Web3Auth SDK with Firebase

To use the Web3Auth SDK, you need to add the dependency of the respective platform SDK of Web3Auth to your project. To know more about the available SDKs, please have a look at this documentation page.

For this guide, we will be talking through the Web3Auth Plug and Play No Modal SDK and using the OpenLogin Provider alongside it to enable Custom Authentication through Firebase.

Setting up your base project for using Web3 libraries:

If you are starting from scratch, to set up this project locally, you will need to create a base Web application, where you can install the required dependencies. However, while working with Web3, there are a few base libraries, which need additional configuration. This is because certain packages are not available in the browser environment, and we need to polyfill them manually. You can follow this documentation where we have mentioned the configuration changes for some popular frameworks for your reference.


For this project, you need to add the following Web3Auth dependencies to your package.json

npm install --save @web3auth/no-modal @web3auth/openlogin-adapter @web3auth/ethereum-provider @web3auth/base web3 firebase

Understanding the Dependencies

Web3Auth Dependencies


This is the main Core package that contains the Web3Auth SDK.

npm install --save @web3auth/no-modal

For using Custom Authentication, we need to use the OpenLogin Adapter, where we can initialize the authentication details.

npm install --save @web3auth/openlogin-adapter

For using the EVM compatible blockchains, we need to use the Ethereum Provider package, which will be used to connect to the blockchain.

npm install --save @web3auth/ethereum-provider

Since we're using typescript, we need the @web3auth/base package to provide the types of the different variables we'll be using throughout the app building process. This reduces errors to a very large extent.

npm install --save @web3auth/base


Once installed, your Web3Auth application needs to be initialized. Initialization is a 4 step process where we add all the config details for Web3Auth:

  1. Instantiation
  2. Configuration of Adapters
  3. Configuration of Plugins
  4. Initialization of the Web3Auth

Please make sure all of this is happening in your application constructor. This makes sure that Web3Auth is initialized when your application starts up.

For this guide, we're only focusing on the Instantiation, Configuration for the Openlogin Adapter (the default adapter that enables social logins) and Initialization of the Web3Auth SDK. To know more about the other things you can do with Web3Auth, check out our SDK Reference.

Instantiating Web3Auth

Importing the packages
import { WALLET_ADAPTERS, CHAIN_NAMESPACES, IProvider } from "@web3auth/base";
import { Web3AuthNoModal } from "@web3auth/no-modal";
import { OpenloginAdapter } from "@web3auth/openlogin-adapter";
import { EthereumPrivateKeyProvider } from "@web3auth/ethereum-provider";

Alongside the Web3Auth and OpenloginAdapter you need the above-mentioned packages from @web3auth/base for different initializations mentioned further in this guide.

Instantiate the Web3Auth SDK
import { Web3AuthNoModal } from "@web3auth/no-modal";
import { CHAIN_NAMESPACES } from "@web3auth/base";

const chainConfig = {
chainNamespace: CHAIN_NAMESPACES.EIP155,
chainId: "0x1",
rpcTarget: "",
displayName: "Ethereum Mainnet",
blockExplorerUrl: "",
ticker: "ETH",
tickerName: "Ethereum",

const web3auth = new Web3AuthNoModal({
web3AuthNetwork: "sapphire_mainnet",

Here, we're using the chainConfig property to set the chainId and chainNamespace. The chainId and chainNamespace are the id and the namespace respectively of the chain you're connecting to. We've initialized them for EVM for this guide. You can find the list of available providers here to select from.

Additionally, sometimes you might face clogging in the network because the test network is a bit clogged at that point. To avoid this, we can use the property rpcTarget and pass over the URL of the node you want to connect to.

Initialize Firebase with Firebase configuration
// Import the functions you need from the SDK
import { initializeApp } from "firebase/app";

// Your web app's Firebase configuration
const firebaseConfig = {
apiKey: "AIzaSyDEfyUmXDhgGWibRUro2EBoX8-TtBKMYyA",
authDomain: "",
projectId: "web3auth-x-firebase-demo-e3332",
storageBucket: "",
messagingSenderId: "108145034076",
appId: "1:108145034076:web:3ff4c0088ec4c311b17799",

// Initialize Firebase
const app = initializeApp(firebaseConfig);

Import initializeApp from the Firebase SDK and use the firebaseConfig obtained above to initialize the Firebase web app.

Initializing the Openlogin Adapter

const privateKeyProvider = new EthereumPrivateKeyProvider({ config: { chainConfig } });

const openloginAdapter = new OpenloginAdapter({
adapterSettings: {
uxMode: "redirect", // redirect or popup
loginConfig: {
jwt: {
verifier: "w3a-firebase-demo", // name of the verifier created on Web3Auth Dashboard
typeOfLogin: "jwt",
clientId: "BPi5PB_UiIZ-cPz1GtV5i1I2iOSOHuimiXBI0e-Oe_u6X3oVAbCiAZOTEBtTXw4tsluTITPqA8zMsfxIKMjiqNQ",


Here, you need to pass over your Web3Auth clientId in the adapterSettings object and your Custom Auth verifierName in the loginConfig object. This makes sure that the Openlogin Adapter can connect to the correct verifier and Firebase server.

Initializing the Web3Auth SDK

await web3auth.init();

Initializing on Mobile Platforms

  • For Mobile, depending on the platform, there will be different steps to initialize the SDK. Refer to the respective Mobile SDKs,


Login is a two-step process:

  1. Firstly, we will login with Firebase(Google) to get the idToken.
  2. Next, we will pass the received idToken to web3auth to log in via Web3Auth SDK to generate the public-private key pair for easier onboarding to Web3.
Login with Firebase
import { GoogleAuthProvider, getAuth, signInWithPopup, UserCredential } from "firebase/auth";

const signInWithGoogle = async (): Promise<UserCredential> => {
try {
const app = initializeApp(firebaseConfig);
const auth = getAuth(app);
const googleProvider = new GoogleAuthProvider();
const res = await signInWithPopup(auth, googleProvider);
return res;
} catch (err) {
throw err;

const loginRes = await signInWithGoogle();
const idToken = await loginRes.user.getIdToken(true); // this idToken will be passed to web3auth
Login with Web3Auth

Once initialized, and idToken is obtained from Firebase, you can use the connectTo() function to authenticate the user with Web3Auth.

import { WALLET_ADAPTERS } from "@web3auth/base";

await web3auth.connectTo(WALLET_ADAPTERS.OPENLOGIN, {
loginProvider: "jwt",
extraLoginOptions: {
id_token: idToken,
verifierIdField: "sub", // same as your JWT Verifier ID field

When connecting, your connectTo function takes the arguments for the adapter you want to connect to and the options for the login. Few major things to note here is the idToken and domain option in the extraLoginOptions object. This is the idToken received from Firebase SDK and domain is your application domain so that you can be redirected after login from the Web3Auth Plug and Play No Modal SDK.

Get the User Profile

const user = await web3auth.getUserInfo();
console.log("User info", user);

Using the getUserInfo function, you can get the details of the logged in user. Please note that these details are not stored anywhere in Web3Auth network, but are fetched from the id_token you received from Firebase and lives in the frontend context.


Logging out your user is as simple as calling the logout function.

await web3auth.logout();

Interacting with Blockchain

So if you have completed this far, it means that you have successfully authenticated your user. Now, you can use the provider returned by Web3Auth as web3auth.provider to interact with your blockchain. You can use the Provider SDKs to perform RPC Calls to your blockchain.

Web3Auth is chain agnostic, ie. depending on whatever blockchain or layer-2 you use, Web3Auth can easily support that. Web3Auth has native providers for EVM and Solana blockchains and for others, you can get the private key in the user scope and make RPC calls. For standardising the type of provider, Web3Auth Base provides a IProvider from which you can create your own provider.

  • Ethereum Provider gives you the capability of making RPC calls to the EVM compatible blockchains.
  • Solana Provider gives you the capability of making RPC calls to the Solana blockchain.
  • XRPL Provider gives you the capability of making RPC calls to the XRPL blockchain.
  • If you want to use any other chain except Solana or EVM chains, for ex: Starknet, you can specify the value of chainNamespace field as other in the Web3Auth SDK Constructor. Refer to: Using other blockchains

Get User Accounts

const getAccounts = async () => {
if (!provider) {
console.log("provider not initialized yet");
const web3 = new Web3(provider as any);
const userAccounts = await web3.eth.getAccounts();

View User Balance

const getBalance = async () => {
if (!provider) {
console.log("provider not initialized yet");
const web3 = new Web3(provider as any);
const accounts = await web3.eth.getAccounts();
const balance = await web3.eth.getBalance(accounts[0]);

Sign Message

const signMessage = async () => {
if (!provider) {
console.log("provider not initialized yet");
const web3 = new Web3(provider as any);
// Get user's Ethereum public address
const account = (await web3.eth.getAccounts())[0];

// Message
const message = "Hello MPC, Bye Bye SeedPhrase";

const typedMessage = [
type: "string",
name: "message",
value: message,
const params = [JSON.stringify(typedMessage), account];
const method = "eth_signTypedData";

const signedMessage = await this.provider.request({

Sign Transaction

const signTransaction = async () => {
if (!provider) {
console.log("provider not initialized yet");
const web3 = new Web3(provider as any);
const accounts = await web3.eth.getAccounts();

const txRes = await web3.eth.signTransaction({
from: accounts[0],
to: accounts[0],
value: web3.utils.toWei("0.0001"),
chainId: 1, // change it to your specific chain id.

Send Transaction

const sendTransaction = async () => {
if (!provider) {
console.log("provider not initialized yet");
const web3 = new Web3(provider as any);
const accounts = await web3.eth.getAccounts();

const txRes = await web3.eth.sendTransaction({
from: accounts[0],
to: accounts[0],
value: web3.utils.toWei("0.0001"),
chainId: 1, // change it to your specific chain id.

Example code

Try our Demo Application with Web3Auth & Firebase integration. It works for either Ethereum, Solana or Polygon. The source code for the demo application is available here.

The code for the application we developed in this guide can be found in the Web3Auth Firebase Example. Check it out and try running it locally yourself!


Ask us on Web3Auth's Community Support Portal