Auth0

Overview

Auth0 is an identity management platform designed to streamline the integration of authentication and authorization functionalities into software applications. It provides developers with APIs and SDKs to implement various identity-related features, including user login, registration, multi-factor authentication (MFA), and single sign-on (SSO). The platform is built to abstract the complexities of identity protocols such as OAuth 2.0 and OpenID Connect, allowing developers to focus on core application logic rather than the intricacies of security implementation.

The platform primarily serves developers and organizations seeking to integrate identity services rapidly. Its offerings cater to a range of use cases, from small startups requiring basic user authentication to large enterprises needing complex B2B and multi-tenant identity solutions. Auth0 emphasizes developer experience through its comprehensive documentation, pre-built UI components like Universal Login, and a wide selection of SDKs supporting various programming languages and frameworks, including React Native and Flutter.

Auth0's architecture supports customizable login flows, enabling developers to tailor the user experience to match their application's branding and specific security requirements. This includes options for social logins (e.g., Google, Facebook), enterprise identity providers (e.g., SAML, OIDC), and passwordless authentication. For machine-to-machine (M2M) communication, Auth0 provides mechanisms for securing API access using client credentials and JWTs, which is relevant for microservices architectures and IoT applications.

The platform also includes features for user management, allowing administrators to view, create, and manage user accounts, roles, and permissions through a centralized dashboard or API. Security features such as anomaly detection, brute-force protection, and breached password detection are integrated to help protect user accounts and data. Auth0 maintains various compliance certifications, including SOC 2 Type II, GDPR, and ISO 27001, addressing regulatory requirements for handling sensitive user information.

While owned by Okta, Auth0 operates as an independent product focused on developer-centric identity solutions. It aims to provide a balance between ease of integration and comprehensive feature sets for identity management across different application types and deployment environments.

Key features

• Universal Login: A hosted, customizable login page that handles authentication flows, reducing UI development effort for login, signup, and password reset processes.
• Multi-factor Authentication (MFA): Supports various MFA methods, including push notifications, SMS, email, and authenticator apps, to add an extra layer of security.
• Single Sign-On (SSO): Enables users to log in once and access multiple applications without re-authenticating, improving user experience and security.
• API Authorization: Secures APIs by issuing JSON Web Tokens (JWTs) and managing access control policies, ensuring only authorized applications and users can access resources.
• Machine to Machine (M2M) Authentication: Provides mechanisms for secure communication between services or applications without human user intervention, typically using client credentials.
• User Management: Offers a dashboard and API for managing user profiles, roles, permissions, and security settings across all connected applications.
• Social Logins: Integrates with popular social identity providers like Google, Facebook, and Apple for user registration and login.
• Enterprise Federation: Connects with enterprise identity providers such as Active Directory, LDAP, SAML, and OpenID Connect for corporate user authentication.
• Passwordless Authentication: Supports login methods like magic links and SMS codes, eliminating the need for users to remember passwords.
• Extensibility with Actions/Hooks: Allows developers to customize authentication and authorization flows using serverless functions (Actions) or webhooks (Hooks) at various points in the identity pipeline.

Pricing

Auth0 offers a free tier for small-scale applications and tiered pricing plans based on Monthly Active Users (MAU) and feature sets. Enterprise-grade features and B2B solutions are typically priced via custom quotes.

Pricing as of May 2026

For detailed and up-to-date pricing information, refer to the Auth0 pricing page.

Common integrations

• Mobile SDKs: Integrates with Swift/Objective-C for iOS, Android SDK, React Native, and Flutter for mobile applications.
• Web Frameworks: Provides SDKs for popular web frameworks like React, Angular, and Vue.js for front-end integration.
• Backend Frameworks: Supports backend integration with Node.js, Python, Java, PHP, .NET, Go, and Ruby.
• Databases & User Stores: Can connect to various user stores, including custom databases, LDAP, and Active Directory.
• Cloud Providers: Integrates with services from AWS, Google Cloud, and Azure for deployment and supplementary services.
• CRM & Marketing Automation: Can be integrated with CRM systems and marketing platforms to sync user data.
• Monitoring & Logging: Supports integration with logging and monitoring tools for security event analysis.

Alternatives

• Okta: A comprehensive identity platform, which also owns Auth0, offering broader enterprise identity and access management solutions.
• Firebase Authentication: Google's authentication service, providing easy integration with Firebase projects and supporting various login methods.
• Amazon Cognito: AWS's identity service that provides user sign-up, sign-in, and access control for web and mobile apps.
• Microsoft Entra ID (formerly Azure Active Directory): Microsoft's cloud-based identity and access management service, primarily for enterprise applications.
• Keycloak: An open-source identity and access management solution for modern applications and services.

Getting started

To get started with Auth0, you typically register an application in the Auth0 dashboard, retrieve your domain and client ID, and then integrate one of Auth0's SDKs into your application. Below is a basic example using the Auth0 Node.js SDK for a simple Express.js application to protect a route.

// Install Auth0 Express.js SDK: npm install express express-openid-connect

const express = require('express');
const { auth } = require('express-openid-connect');

const app = express();
const port = 3000;

const config = {
  authRequired: false,
  auth0Logout: true,
  secret: 'YOUR_LONG_RANDOM_SECRET_STRING',
  baseURL: 'http://localhost:3000',
  clientID: 'YOUR_AUTH0_CLIENT_ID',
  issuerBaseURL: 'https://YOUR_AUTH0_DOMAIN',
};

// auth router attaches /login, /logout, and /callback routes to the baseURL
app.use(auth(config));

// req.isAuthenticated is now available
app.get('/', (req, res) => {
  res.send(req.oidc.isAuthenticated() ? 'Logged in' : 'Logged out');
});

// Protect a route
app.get('/profile', req.oidc.ensureAuthenticated(), (req, res) => {
  res.send(`Hello ${req.oidc.user.name}, this is your profile.`);
});

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`);
});

This example sets up an Express.js application with Auth0 for authentication. Replace YOUR_LONG_RANDOM_SECRET_STRING, YOUR_AUTH0_CLIENT_ID, and https://YOUR_AUTH0_DOMAIN with your actual Auth0 application credentials. The /profile route is protected, requiring a user to be authenticated via Auth0's Universal Login page before access is granted. More detailed instructions and examples for various languages and frameworks can be found in the Auth0 documentation.