@auth0/auth0-spa-js

What is @auth0/auth0-spa-js?

@auth0/auth0-spa-js is a JavaScript library designed to handle authentication in single-page applications (SPAs) using Auth0. It provides a simple and secure way to integrate Auth0's authentication and authorization services into your SPA.

What are @auth0/auth0-spa-js's main functionalities?

Login

This feature allows users to log in to your application using Auth0. The code sample demonstrates how to create an Auth0 client and initiate a login redirect.

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

await auth0.loginWithRedirect({
  redirect_uri: window.location.origin
});

Logout

This feature allows users to log out of your application. The code sample shows how to log out and redirect the user to the home page.

await auth0.logout({
  returnTo: window.location.origin
});

Get User Information

This feature retrieves the authenticated user's information. The code sample demonstrates how to get the user profile after authentication.

const user = await auth0.getUser();
console.log(user);

Token Handling

This feature handles token retrieval for authenticated requests. The code sample shows how to get an access token silently without redirecting the user.

const token = await auth0.getTokenSilently();
console.log(token);

Other packages similar to @auth0/auth0-spa-js

oidc-client

oidc-client is a JavaScript library for OpenID Connect (OIDC) and OAuth2. It provides similar functionalities for handling authentication and authorization in SPAs. Compared to @auth0/auth0-spa-js, oidc-client is more generic and can be used with any OIDC-compliant identity provider.

firebase

Firebase Authentication provides backend services to help authenticate users in your application. It supports various authentication methods, including email/password, phone, and social providers. Unlike @auth0/auth0-spa-js, Firebase offers a broader range of services beyond authentication, such as database and hosting.

README

@auth0/auth0-spa-js

Auth0 SDK for Single Page Applications using Authorization Code Grant Flow with PKCE.

Table of Contents

• Documentation
• Installation
• Getting Started
• Contributing
• Support + Feedback
• Frequently Asked Questions
• Vulnerability Reporting
• What is Auth0
• License

Documentation

• Documentation
• API reference
• Migrate from Auth0.js to the Auth0 Single Page App SDK

Installation

From the CDN:

<script src="https://cdn.auth0.com/js/auth0-spa-js/1.18/auth0-spa-js.production.js"></script>

Using npm:

npm install @auth0/auth0-spa-js

Using yarn:

yarn add @auth0/auth0-spa-js

Getting Started

Creating the client

Create an Auth0Client instance before rendering or initializing your application. You should only have one instance of the client.

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

//with async/await
const auth0 = await createAuth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  redirect_uri: '<MY_CALLBACK_URL>'
});

//with promises
createAuth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  redirect_uri: '<MY_CALLBACK_URL>'
}).then(auth0 => {
  //...
});

//or, you can just instantiate the client on it's own
import { Auth0Client } from '@auth0/auth0-spa-js';

const auth0 = new Auth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  redirect_uri: '<MY_CALLBACK_URL>'
});

//if you do this, you'll need to check the session yourself
try {
  await getTokenSilently();
} catch (error) {
  if (error.error !== 'login_required') {
    throw error;
  }
}

1 - Login

<button id="login">Click to Login</button>

//with async/await

//redirect to the Universal Login Page
document.getElementById('login').addEventListener('click', async () => {
  await auth0.loginWithRedirect();
});

//in your callback route (<MY_CALLBACK_URL>)
window.addEventListener('load', async () => {
  const redirectResult = await auth0.handleRedirectCallback();
  //logged in. you can get the user profile like this:
  const user = await auth0.getUser();
  console.log(user);
});

//with promises

//redirect to the Universal Login Page
document.getElementById('login').addEventListener('click', () => {
  auth0.loginWithRedirect().catch(() => {
    //error while redirecting the user
  });
});

//in your callback route (<MY_CALLBACK_URL>)
window.addEventListener('load', () => {
  auth0.handleRedirectCallback().then(redirectResult => {
    //logged in. you can get the user profile like this:
    auth0.getUser().then(user => {
      console.log(user);
    });
  });
});

2 - Calling an API

<button id="call-api">Call an API</button>

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

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

3 - Logout

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

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

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

You can redirect users back to your app after logging out. This URL must appear in the Allowed Logout URLs setting for the app in your Auth0 Dashboard:

auth0.logout({
  returnTo: 'https://your.custom.url.example.com/'
});

Data caching options

The SDK can be configured to cache ID tokens and access tokens either in memory or in local storage. The default is in memory. This setting can be controlled using the cacheLocation option when creating the Auth0 client.

To use the in-memory mode, no additional options need are required as this is the default setting. To configure the SDK to cache data using local storage, set cacheLocation as follows:

await createAuth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  redirect_uri: '<MY_CALLBACK_URL>',
  cacheLocation: 'localstorage' // valid values are: 'memory' or 'localstorage'
});

Important: This feature will allow the caching of data such as ID and access tokens to be stored in local storage. Exercising this option changes the security characteristics of your application and should not be used lightly. Extra care should be taken to mitigate against XSS attacks and minimize the risk of tokens being stolen from local storage.

Creating a custom cache

The SDK can be configured to use a custom cache store that is implemented by your application. This is useful if you are using this SDK in an environment where more secure token storage is available, such as potentially a hybrid mobile app.

To do this, provide an object to the cache property of the SDK configuration.

The object should implement the following functions. Note that all of these functions can optionally return a Promise or a static value.

Signature	Return type	Description
get(key)	Promise or object	Returns the item from the cache with the specified key, or undefined if it was not found
set(key: string, object: any)	Promise or void	Sets an item into the cache
remove(key)	Promise or void	Removes a single item from the cache at the specified key, or no-op if the item was not found
allKeys()	Promise<string[]> or string []	(optional) Implement this if your cache has the ability to return a list of all keys. Otherwise, the SDK internally records its own key manifest using your cache. Note: if you only want to ensure you only return keys used by this SDK, the keys we use are prefixed with @@auth0spajs@@

Here's an example of a custom cache implementation that uses sessionStorage to store tokens and apply it to the Auth0 SPA SDK:

const sessionStorageCache = {
  get: function (key) {
    return JSON.parse(sessionStorage.getItem(key));
  },

  set: function (key, value) {
    sessionStorage.setItem(key, JSON.stringify(value));
  },

  remove: function (key) {
    sessionStorage.removeItem(key);
  },

  // Optional
  allKeys: function () {
    return Object.keys(sessionStorage);
  }
};

await createAuth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  redirect_uri: '<MY_CALLBACK_URL>',
  cache: sessionStorageCache
});

Note: The cache property takes precedence over the cacheLocation property if both are set. A warning is displayed in the console if this scenario occurs.

We also export the internal InMemoryCache and LocalStorageCache implementations, so you can wrap your custom cache around these implementations if you wish.

Refresh Tokens

Refresh tokens can be used to request new access tokens. Read more about how our refresh tokens work for browser-based applications to help you decide whether or not you need to use them.

To enable the use of refresh tokens, set the useRefreshTokens option to true:

await createAuth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  redirect_uri: '<MY_CALLBACK_URL>',
  useRefreshTokens: true
});

Using this setting will cause the SDK to automatically send the offline_access scope to the authorization server. Refresh tokens will then be used to exchange for new access tokens instead of using a hidden iframe, and calls the /oauth/token endpoint directly. This means that in most cases the SDK does not rely on third-party cookies when using refresh tokens.

Note This configuration option requires Rotating Refresh Tokens to be enabled for your Auth0 Tenant.

Refresh Token fallback

In all cases where a refresh token is not available, the SDK falls back to the legacy technique of using a hidden iframe with prompt=none to try and get a new access token and refresh token. This scenario would occur for example if you are using the in-memory cache and you have refreshed the page. In this case, any refresh token that was stored previously would be lost.

If the fallback mechanism fails, a login_required error will be thrown and could be handled in order to put the user back through the authentication process.

Note: This fallback mechanism does still require access to the Auth0 session cookie, so if third-party cookies are being blocked then this fallback will not work and the user must re-authenticate in order to get a new refresh token.

Organizations

Organizations is a set of features that provide better support for developers who build and maintain SaaS and Business-to-Business (B2B) applications.

Log in to an organization

Log in to an organization by specifying the organization parameter when setting up the client:

createAuth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  redirect_uri: '<MY_CALLBACK_URL>',
  organization: '<MY_ORG_ID>'
});

You can also specify the organization when logging in:

// Using a redirect
client.loginWithRedirect({
  organization: '<MY_ORG_ID>'
});

// Using a popup window
client.loginWithPopup({
  organization: '<MY_ORG_ID>'
});

Accept user invitations

Accept a user invitation through the SDK by creating a route within your application that can handle the user invitation URL, and log the user in by passing the organization and invitation parameters from this URL. You can either use loginWithRedirect or loginWithPopup as needed.

const url = new URL(invitationUrl);
const params = new URLSearchParams(url.search);
const organization = params.get('organization');
const invitation = params.get('invitation');

if (organization && invitation) {
  client.loginWithRedirect({
    organization,
    invitation
  });
}

Advanced options

Advanced options can be set by specifying the advancedOptions property when configuring Auth0Client. Learn about the complete set of advanced options in the API documentation

createAuth0Client({
  domain: '<AUTH0_DOMAIN>',
  client_id: '<AUTH0_CLIENT_ID>',
  advancedOptions: {
    defaultScope: 'email' // change the scopes that are applied to every authz request. **Note**: `openid` is always specified regardless of this setting
  }
});

Contributing

We appreciate feedback and contribution to this repo! Before you get started, please see the following:

• Auth0's general contribution guidelines
• Auth0's code of conduct guidelines
• This repo's contribution guide

Support + Feedback

For support or to provide feedback, please raise an issue on our issue tracker.

Frequently Asked Questions

For a rundown of common issues you might encounter when using the SDK, please check out the FAQ.

Vulnerability Reporting

Please do not report security vulnerabilities on the public GitHub issue tracker. The Responsible Disclosure Program details the procedure for disclosing security issues.

What is Auth0?

Auth0 helps you to easily:

• implement authentication with multiple identity providers, including social (e.g., Google, Facebook, Microsoft, LinkedIn, GitHub, Twitter, etc), or enterprise (e.g., Windows Azure AD, Google Apps, Active Directory, ADFS, SAML, etc.)
• log in users with username/password databases, passwordless, or multi-factor authentication
• link multiple user accounts together
• generate signed JSON Web Tokens to authorize your API calls and flow the user identity securely
• access demographics and analytics detailing how, when, and where users are logging in
• enrich user profiles from other data sources using customizable JavaScript rules

Why Auth0?

License

This project is licensed under the MIT license. See the LICENSE file for more info.

Changelog

v1.18.0 (2021-09-15)

Full Changelog

Added

• [SDK-2750] Expose mfa_token from the mfa_required error when getting new tokens #789 (frederikprijck)

Changed

• [SDK-2759] Re-scoping cookies and transactions to client ID #796 (stevehobbsdev)
• [SDK-2320] Throw login_required error in SPA SDK if running in a cross-origin is… #790 (frederikprijck)

Fixed

• [SDK-2692] Remember organization ID for silent authentication #788 (stevehobbsdev)