Learn how to use Auth0 with Web3Auth

This guide will cover the basics of how to set up your Web3Auth Plug and Play No Modal SDK and Auth0 account for the integration and provide you with the links on how to develop a basic web application on the blockchain of your choice.

Quick Start​

npx degit Web3Auth/web3auth-pnp-examples/web-no-modal-sdk/custom-authentication/single-verifier-examples/auth0-no-modal-example w3a-auth0-demo && cd w3a-auth0-demo && npm install && npm run start

How it works?​

• When a user logs in with Auth0, Auth0 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.

Prerequisites​

• 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

• Create an Auth0 tenant and configure a Single Page Web Application (SPA for Web) or Native (for Mobile) from Auth0 Console.

• Please note that Regular Web Applications are also supported as mentioned in the flows above. However, for this guide, we prefer SPA since its implicit flow doesn’t require an application to host a backend server.

Setup your Auth0 Tenant​

• Add the following URLs for your app to the Allowed Web Origins field when configuring your Auth0 Application.

  • Additional to your URLs for the application, please add
    • https://auth.web3auth.io/auth

  

• You will require the domain and clientId of the newly created application which you can copy from Auth0 Console.

Enable Social Login​

• Enable Google or other social provider on the Authentication > Social page of your Auth0 Dashboard.
• Visit https://auth0.com/learn/social-login to learn more.

Enable SMS Passwordless​

• Enable SMS on the Authentication > Passwordless page of your Auth0 Dashboard.
• Under the Settings tab, add your Twilio SID and Twilio AuthToken.
• Also, update the From number on the same page, and click on the Save button.
• Next, enable your application under the Applications tab, and click on the Save button.
• You can test sending an SMS from the Try tab. Once, an SMS comes with OTP, it means it has been successfully configured.

Update Lockscreen for SMS Passwordless​

Enable Email Passwordless​

• Enable Email on the Authentication > Passwordless page of your Auth0 Dashboard.
• Under the Settings tab, update From and Subject based on your need and click on the Save button.
• Next, enable your application under the Applications tab, and click on the Save button.
• You can test sending an Email from the Try tab. Once, an Email comes with OTP/Link, it means it has been successfully configured.

Update Lockscreen for Email Passwordless​

Setup your Web3Auth Dashboard​

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

    

Create Auth0 Verifiers​

• Create a Verifier from the Custom Auth Section of the Developer Dashboard with the following configuration:

  • Pick a name of your choice for the verifier identifier. eg. auth0-project

  • Choose Social Login Providers and select Auth0 from the Login Provider dropdown.

  • Next, Choose your Authentication Type from eg. Google, Twitter, GitHub etc.. to be the Auth provider.

  • Paste the Client ID and Auth0 Domain from the Auth0 SPA you created in the above steps. This will be used to validate the JWT token issued by Auth0. And, select Sub or Email as the JWT Verifier ID.

  • Click on the Create Verifier button to create your verifier. It may take up to 10-20 minutes to deploy the verifier on Sapphire Devnet. You'll receive an email once it's complete.

    

  You will require the verifierName of the newly created verifier and clientId of the Plug and Play Project.

Create SMS Passwordless Verifier​

• Create a Verifier from the Custom Auth Section of the Developer Dashboard with the following configuration:

  • Choose a name of your choice for the verifier identifier. eg. auth0-sms-passwordless

  • Select Custom Providers from the Login Provider.

  • Choose Custom for the JWT Verifier ID and type name.

  • Enter https://{YOUR-DOMAIN}/.well-known/jwks.json as your JWKS Endpoint. This will be used to validate the JWT token issued by Auth0. eg. https://web3auth.eu.auth0.com/.well-known/jwks.json

  • JWT validation fields:

    • iss: https://{YOUR-DOMAIN}
    • aud: {AUTH0-CLIENT-ID}

  • Click on the Create button to create your verifier. It may take up to 10-20 minutes to deploy the verifier on Sapphire Devnet. You'll receive an email once it's complete.

    

  You will require the verifierName of the newly created verifier and clientId of the Plug and Play Project.

Create Email Passwordless Verifier​

• Create a Verifier from the Custom Auth Section of the Developer Dashboard with the following configuration:

  • Choose a name of your choice for the verifier identifier. eg. auth0-email-passwordless

  • Choose Social Login Providers and select Auth0 from the Login Provider dropdown.

  • Choose your Authentication Type as Email Passwordless to use Auth0's Email Passwordless.

  • Paste the Client ID and Auth0 Domain from the Auth0 SPA you created in the above steps. This will be used to validate the JWT token issued by Auth0.

  • Click on the Create button to create your verifier. It may take up to 10-20 minutes to deploy the verifier on Sapphire Devnet. You'll receive an email once it's complete.

    

  You will require the verifierName of the newly created verifier and clientId of the Plug and Play Project.

Using the Web3Auth Plug and Play No Modal SDK​

To use the Web3Auth Plug and Play No Modal 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 Auth Adapter alongside it to enable Custom Authentication through Auth0.

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.

Installation​

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

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

Understanding the Dependencies​

npm install --save @web3auth/no-modal

npm install --save @web3auth/auth-adapter

npm install --save @web3auth/ethereum-provider

npm install --save @web3auth/base

npm install --save web3

Initialization​

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 Auth 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 { AuthAdapter } from "@web3auth/auth-adapter";
import { EthereumPrivateKeyProvider } from "@web3auth/ethereum-provider";

Alongside the Web3Auth and AuthAdapter 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: "https://rpc.ankr.com/eth",
  displayName: "Ethereum Mainnet",
  blockExplorerUrl: "https://etherscan.io",
  ticker: "ETH",
  tickerName: "Ethereum",
};

const web3auth = new Web3AuthNoModal({
  clientId:
    "BPi5PB_UiIZ-cPz1GtV5i1I2iOSOHuimiXBI0e-Oe_u6X3oVAbCiAZOTEBtTXw4tsluTITPqA8zMsfxIKMjiqNQ",
  web3AuthNetwork: "sapphire_mainnet",
  chainConfig,
});

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.

Initializing the Auth Adapter​

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

const authAdapter = new AuthAdapter({
  adapterSettings: {
    clientId: "YOUR-WEB3AUTH-CLIENT-ID", //Optional - Provide only if you haven't provided it in the Web3Auth Instantiation Code
    uxMode: "popup",
    loginConfig: {
      jwt: {
        verifier: "YOUR-VERIFIER-NAME-ON-WEB3AUTH-DASHBOARD",
        typeOfLogin: "jwt",
        clientId: "YOUR-AUTH0-CLIENT-ID-FROM-AUTH0-DASHBOARD",
      },
    },
  },
  privateKeyProvider,
});

web3auth.configureAdapter(authAdapter);

Here, you need to pass over your Web3Auth clientId in the adapterSettings object and your Custom Auth verifierName and Auth0 clientId in the loginConfig object. This makes sure that the Auth Adapter can connect to the correct verifier and Auth0 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,
  • Android
  • iOS
  • Flutter
  • React Native

Login​

Once initialized, you can use the connectTo() function to authenticate the user when they click the login button.

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

await web3auth.connectTo(WALLET_ADAPTERS.AUTH, {
  loginProvider: "jwt",
  extraLoginOptions: {
    domain: "https://web3auth.au.auth0.com", // Please append "https://" before your domain
    verifierIdField: "sub", // For SMS & Email Passwordless, use "name" as verifierIdField
  },
});

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

await web3auth.connectTo(WALLET_ADAPTERS.AUTH, {
  loginProvider: "jwt",
  extraLoginOptions: {
    domain: "https://web3auth.au.auth0.com", // Please append "https://" before your domain
    verifierIdField: "name",
  },
});

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

await web3auth.connectTo(WALLET_ADAPTERS.AUTH, {
  loginProvider: "jwt",
  extraLoginOptions: {
    domain: "https://web3auth.au.auth0.com", // Please append "https://" before your domain
    verifierIdField: "name",
  },
});

When connecting, your connectTo function takes the arguments for the adapter you want to connect to and the options for the login. The major thing to note here is the domain option in the extraLoginOptions object. This is the domain of your Auth0 tenant so that you can be redirected to login there directly 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 Auth0 and live in the frontend context.

Logout​

await web3auth.logout();

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

Interacting with the 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");
    return;
  }
  const web3 = new Web3(provider as any);
  const userAccounts = await web3.eth.getAccounts();
  console.log(userAccounts);
};

const getAccounts = async () => {
  if (!provider) {
    console.log("provider not initialized yet");
    return;
  }
  // For ethers v5
  // const ethersProvider = new ethers.providers.Web3Provider(this.provider);
  const ethersProvider = new ethers.BrowserProvider(this.provider);

  // For ethers v5
  // const signer = ethersProvider.getSigner();
  const signer = await ethersProvider.getSigner();

  // Get the user's Ethereum public address
  const address = signer.getAddress();
  console.log(address);
};

View User Balance​

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

const getBalance = async () => {
  if (!provider) {
    console.log("provider not initialized yet");
    return;
  }
  // For ethers v5
  // const ethersProvider = new ethers.providers.Web3Provider(this.provider);
  const ethersProvider = new ethers.BrowserProvider(this.provider);

  // For ethers v5
  // const signer = ethersProvider.getSigner();
  const signer = await ethersProvider.getSigner();

  // Get the user's Ethereum public address
  const address = signer.getAddress();

  // Get the user's balance in ether
  // For ethers v5
  // const balance = ethers.utils.formatEther(
  // await ethersProvider.getBalance(address) // Balance is in wei
  // );
  const balance = ethers.formatEther(
    await ethersProvider.getBalance(address), // Balance is in wei
  );
  console.log(balance);
};

Sign Message​

const signMessage = async () => {
  if (!provider) {
    console.log("provider not initialized yet");
    return;
  }
  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({
    method,
    params,
  });
  console.log(signedMessage);
};

const signMessage = async () => {
  if (!provider) {
    console.log("provider not initialized yet");
    return;
  }
  // For ethers v5
  // const ethersProvider = new ethers.providers.Web3Provider(this.provider);
  const ethersProvider = new ethers.BrowserProvider(this.provider);

  // For ethers v5
  // const signer = ethersProvider.getSigner();
  const signer = await ethersProvider.getSigner();
  const originalMessage = "YOUR_MESSAGE";

  // Sign the message
  const signedMessage = await signer.signMessage(originalMessage);

  console.log(signedMessage);
};

Sign Transaction​

const signTransaction = async () => {
  if (!provider) {
    console.log("provider not initialized yet");
    return;
  }
  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.
  });
  console.log(txRes.transactionHash);
};

Send Transaction​

const sendTransaction = async () => {
  if (!provider) {
    console.log("provider not initialized yet");
    return;
  }
  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.
  });
  console.log(txRes.transactionHash);
};

const sendTransaction = async () => {
  if (!provider) {
    console.log("provider not initialized yet");
    return;
  }
  // For ethers v5
  // const ethersProvider = new ethers.providers.Web3Provider(this.provider);
  const ethersProvider = new ethers.BrowserProvider(this.provider);

  // For ethers v5
  // const signer = ethersProvider.getSigner();
  const signer = await ethersProvider.getSigner();

  const destination = "0x40e1c367Eca34250cAF1bc8330E9EddfD403fC56";

  // Convert 1 ether to wei
  // For ethers v5
  // const amount = ethers.utils.parseEther("0.001");
  const amount = ethers.parseEther("0.001");

  // Submit transaction to the blockchain
  const tx = await signer.sendTransaction({
    to: destination,
    value: amount,
    maxPriorityFeePerGas: "5000000000", // Max priority fee per gas
    maxFeePerGas: "6000000000000", // Max fee per gas
  });

  // Wait for the transaction to be mined
  const receipt = await tx.wait();

  console.log(receipt.transactionHash);
};

Additional Reading: Setup Custom Authentication using Auth0 RWA​

Difference between SPA and RWA​

In the SPA flow, the frontend gets the JWT id_token from Auth0 directly. This flow is leveraged by the Web3Auth SDK, which handles all the callbacks by itself and the user just needs to set up the AuthAdapter and connect to the Web3Auth SDK, adding in the Auth0 client_id in it. Hence, this is the implicit flow and is the most suitable flow for setting up your authentication via Auth0 and Web3Auth.

In the RWA flow, you have to spin up a server on your own where you'll receive the authorization code from Auth0. Web3Auth still requires an id_token to be sent to the AuthAdapter to log the user in the frontend context. This is where you need to make another call from the backend server to Auth0 to get the id_token and pass it over to your frontend where you can send it to the Web3Auth SDK.

Setting up your application with RWA Flow​

• In addition to the steps above, set up your Auth0 RWA on the dashboard and add callback URLs for both your backend and frontend
• On the frontend, your login button should hit on the following URL

https://{YOUR_DOMAIN_URL}/authorize?scope=openid&response_type=code&client_id={YOUR_AUTH0_CLIENT_ID&redirect_uri={YOUR_BACKEND_SERVER_WHICH_WILL_GET_JWT_TOKEN_FROM_AUTH0}&state=STATE

• This is where the user is redirected to a login screen by Auth0.
• On successful login, the user will be redirected to your backend server with authorization code as a query parameter.
• In the backend server, you can use the code to get the id_token from Auth0 and redirect the user to the frontend with id_token as a query parameter

app.get('/callback', (req, res) => {
  var options = {
    method: 'POST',
    url: 'https://{YOUR_DOMAIN_URL}/oauth/token',
    headers: { 'content-type': 'application/x-www-form-urlencoded' },
    form:{
      grant_type: 'authorization_code',
      client_id: 'AUTH0_CLIENT_ID',
      client_secret: 'AUTH0_CLIENT_SECRET',
      code: req.query.code, // the authorization code you got from auth0
      redirect_uri: 'https://{YOUR_FRONTEND_URL}',
      scope: "openid profile email"
    }
   };

   var id_token = "";

   request(options, function (error, response, data) {
    id_token = JSON.parse(data)["id_token"];
    redirect_url = "http://{YOUR_FRONTEND_URL}?token=%22+id_token;
    // Redirection URL to frontend with `id_token` as a query parameter
    res.redirect(redirect_url);
  });
})

• In the frontend, pass on this id_token to the Web3Auth SDK to authenticate the user

await web3auth.connectTo(WALLET_ADAPTERS.AUTH, {
  loginProvider: "jwt",
  extraLoginOptions: {
    id_token: "YOUR_ID_TOKEN_FETCHED_FROM_BACKEND_SERVER",
    verifierIdField: "sub",
  },
});

Try our Demo Application and Example Code​

Try our example app with Web3Auth Plug and Play No Modal SDK & Auth0 integration. It works for either Ethereum, Solana or Polygon. It also works for both flows, ie. SPA and RWA. 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 Auth0 Example. Check it out and try running it locally yourself!

Questions?​

Ask us on Web3Auth's Community Support Portal