SuperTokens — Open Source Auth0 Alternative

What it is

SuperTokens is an open-source authentication solution that provides email/password login, passwordless authentication, social login (Google, GitHub, Apple, etc.), session management, and multi-factor authentication. It ships drop-in UI components for React, Vue, and Angular.

SuperTokens targets teams that want Auth0-level features without vendor lock-in or per-user pricing. You can self-host the core service or use their managed cloud.

How it saves time or tokens

Building authentication from scratch typically takes weeks and introduces security vulnerabilities. SuperTokens provides battle-tested flows for signup, login, password reset, email verification, and session management out of the box. The pre-built UI components mean you do not need to design login forms.

For AI-assisted development, SuperTokens' clear API surface and recipe-based architecture make it straightforward for LLMs to generate integration code.

Additionally, the project's well-structured documentation and active community mean developers spend less time troubleshooting integration issues. When AI coding assistants generate code for this tool, they can reference established patterns from the documentation, producing correct implementations with fewer iterations and lower token costs.

How to use

1. Install the SDK for your backend and frontend:

# Backend (Node.js)
npm install supertokens-node

# Frontend (React)
npm install supertokens-auth-react

1. Initialize SuperTokens in your backend:

const supertokens = require('supertokens-node');
const Session = require('supertokens-node/recipe/session');
const EmailPassword = require('supertokens-node/recipe/emailpassword');

supertokens.init({
  supertokens: { connectionURI: 'http://localhost:3567' },
  appInfo: { appName: 'MyApp', apiDomain: 'http://localhost:3001', websiteDomain: 'http://localhost:3000' },
  recipeList: [EmailPassword.init(), Session.init()]
});

1. Add the pre-built UI to your React app and SuperTokens handles the login flow.

1. Protect API routes using the session verification middleware.

Example

// Protect an API route
const { verifySession } = require('supertokens-node/recipe/session/framework/express');

app.get('/api/protected', verifySession(), (req, res) => {
  const userId = req.session.getUserId();
  res.json({ message: 'Authenticated', userId });
});

Related on TokRepo

• AI Tools for Security — Security tools and authentication solutions
• AI Tools for Self-Hosted — Self-hostable alternatives to SaaS tools

Common pitfalls

• Running the SuperTokens core without persistent storage. The default in-memory mode loses all users on restart. Configure PostgreSQL or MySQL for production.
• Skipping CSRF protection for session-based auth. SuperTokens handles this automatically, but custom middleware can interfere if not configured correctly.
• Not setting up email verification. Users can sign up with invalid emails if email verification is disabled, leading to unrecoverable accounts.
• Failing to review community discussions and changelogs before upgrading. Breaking changes in major versions can disrupt existing workflows. Pin versions in production and test upgrades in staging first.