Auth0 Single Page App SDK

The Auth0 Single Page App SDK is a new JavaScript library for implementing authentication & authorization in single page apps (SPA) with Auth0. It provides a high-level API and handles a lot of the details so you can secure SPAs using best practices while writing less code.

The Auth0 SPA SDK handles grant and protocol details, token expiration and renewal, as well as token storage and cacheing. Under the hood, it implements Universal Login and the Authorization Code Grant Flow with PKCE.

The library and API documentation are hosted on GitHub.

If you encounter any problems or errors when using the new JavaScript SDK, please check out the FAQ to see if your issue is covered there.

You have a few options for using auth0-spa-js in your project:

From the CDN: <script src="https://cdn.auth0.com/js/auth0-spa-js/1.9/auth0-spa-js.production.js"></script>

Using npm: npm install @auth0/auth0-spa-js

Using yarn: yarn add @auth0/auth0-spa-js

First, you'll need to create a new instance of Auth0Client client object. Create the Auth0Client instance before rendering or initializing your application. You can do this using either the async/await method, or with promises. You should only create one instance of the client.

import createAuth0Client from '@auth0/auth0-spa-js';

// either with async/await
const auth0 = await createAuth0Client({
  domain: 'YOUR_DOMAIN',
  client_id: 'YOUR_CLIENT_ID'
});

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// or with promises
createAuth0Client({
  domain: 'YOUR_DOMAIN',
  client_id: 'YOUR_CLIENT_ID'
}).then(auth0 => {
  //...
});

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Using createAuth0Client does a couple of things automatically:

It creates an instance of Auth0Client.
It calls getTokenSilently to refresh the user session.
It suppresses all errors from getTokenSilently, except login_required.

You can also create the client directly using the Auth0Client constructor. This can be useful if:

You wish to bypass the call to getTokenSilently on initialization.
You wish to do custom error handling.
You wish to initialize the SDK in a synchronous way

import { Auth0Client } from '@auth0/auth0-spa-js';

const auth0 = new Auth0Client({
  domain: 'YOUR_DOMAIN',
  client_id: 'YOUR_CLIENT_ID'
});

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Next, create a button users can click to start logging in. <button id="login">Click to Login</button>

Listen for click events on the button you created. When the event occurs, use the desired login method to authenticate the user (loginWithRedirect() in this example). After the user is authenticated, you can retrieve the user profile with the getUser() method.

// either with async/await
document.getElementById('login').addEventListener('click', async () => {
  await auth0.loginWithRedirect({
    redirect_uri: 'http://localhost:3000/'
  });
  //logged in. you can get the user profile like this:
  const user = await auth0.getUser();
  console.log(user);
});

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// or with promises
document.getElementById('login').addEventListener('click', () => {
  auth0.loginWithRedirect({
    redirect_uri: 'http://localhost:3000/'
  }).then(token => {
    //logged in. you can get the user profile like this:
    auth0.getUser().then(user => {
      console.log(user);
    });
  });
});

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To call your API, start by getting the user's Access Token. Then use the Access Token in your request. In this example the getTokenSilently method is used to retrieve the Access Token. <button id="callApi">Call an API</button>

// either with async/await
document.getElementById('callApi').addEventListener('click', async () => {
  const accessToken = await auth0.getTokenSilently();
  const result = await fetch('https://exampleco.com/api', {
    method: 'GET',
    headers: {
      Authorization: 'Bearer ' + accessToken
    }
  });
  const data = await result.json();
  console.log(data);
});

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// or with promises
document.getElementById('callApi').addEventListener('click', () => {
  auth0
    .getTokenSilently()
    .then(accessToken =>
      fetch('https://exampleco.com/api', {
        method: 'GET',
        headers: {
          Authorization: 'Bearer ' + accessToken
        }
      })
    )
    .then(result => result.json())
    .then(data => {
      console.log(data);
    });
});

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Add a button users can click to logout.

<button id="logout">Logout</button>

document.getElementById('logout').addEventListener('click', () => {
  auth0.logout();
});

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The Auth0 SPA SDK stores tokens in memory by default. However, this does not provide persistence across page refreshes and browser tabs. Instead, you can opt-in to store tokens in local storage by setting the cacheLocation property to localstorage when initializing the SDK. This can help to mitigate some of the effects of browser privacy technology that prevents access to the Auth0 session cookie by storing Access Tokens for longer.

Storing tokens in browser local storage provides persistence across page refreshes and browser tabs. However, if an attacker can achieve running JavaScript in the SPA using a cross-site scripting (XSS) attack, they can retrieve the tokens stored in local storage. A vulnerability leading to a successful XSS attack can be either in the SPA source code or in any third-party JavaScript code (such as bootstrap, jQuery, or Google Analytics) included in the SPA.

Read more about token storage.

const auth0 = await createAuth0Client({
  domain: 'YOUR_DOMAIN',
  client_id: 'YOUR_CLIENT_ID',
  cacheLocation: 'localstorage'
});

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The Auth0 SPA SDK can be configured to use rotating Refresh Tokens to get new access tokens silently. These can be used to bypass browser privacy technology that prevents access to the Auth0 session cookie when authenticating silently, as well as providing built-in reuse detection.

Configure the SDK to do this by setting useRefreshTokens to true on initialization:

const auth0 = await createAuth0Client({
  domain: 'YOUR_DOMAIN',
  client_id: 'YOUR_CLIENT_ID',
  useRefreshTokens: true
});

// Request a new access token using a refresh token
const token = await auth0.getTokenSilently();

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Refresh Tokens will also need to be configured for your tenant before they can be used in your SPA.

Once configured, the SDK will request the offline_access scope during the authorization step. Furthermore, getTokenSilently will then call the /oauth/token endpoint directly to exchange refresh tokens for access tokens. The SDK will obey the storage configuration when storing refresh tokens. If the SDK has been configured using the default in-memory storage mechanism, refresh tokens will be lost when refreshing the page.

Below are examples of usage for various methods in the SDK. Note that jQuery is used in these examples.

$('#loginRedirect').click(async () => {
  await auth0.loginWithRedirect({
    redirect_uri: 'http://localhost:3000/'
  });
});

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Redirect to the /authorize endpoint at Auth0, starting the Universal Login flow.

$('#loginRedirectCallback').click(async () => {
  await auth0.handleRedirectCallback();
});

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Get a new Access Token silently using either a hidden iframe and prompt=none, or by using a rotating Refresh Token. Refresh Tokens are used when useRefreshTokens is set to true when configuring the SDK. If in-memory storage (the default) and refresh tokens are used, new tokens are retrieved using a web worker on supported browsers.

$('#getToken').click(async () => {
  const token = await auth0.getTokenSilently();
});

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The getTokenSilently() method requires you to have Allow Skipping User Consent enabled in your API Settings in the Dashboard. Additionally, user consent cannot be skipped on 'localhost'.

$('#getTokenPopup').click(async () => {
  const token = await auth0.getTokenWithPopup({
    audience: 'https://mydomain/api/',
    scope: 'read:rules'
  });
});

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$('#getToken_audience').click(async () => {
  const differentAudienceOptions = {
    audience: 'https://mydomain/another-api/',
    scope: 'read:rules',
    redirect_uri: 'http://localhost:3000/callback.html'
  };
  const token = await auth0.getTokenSilently(differentAudienceOptions);
});

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$('#getUser').click(async () => {
  const user = await auth0.getUser();
});

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$('#getIdTokenClaims').click(async () => {
  const claims = await auth0.getIdTokenClaims();
  // if you need the raw id_token, you can access it
  // using the __raw property
  const id_token = claims.__raw;
});

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$('#logout').click(async () => {
  auth0.logout({
    returnTo: 'http://localhost:3000/'
  });
});

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$('#logoutNoClientId').click(async () => {
  auth0.logout({
    client_id: null,
    returnTo: 'http://localhost:3000/'
  });
});

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Docs