100 Authentication & Authorization resources for developers

Use Clerk for rapid Next.js integration. It provides pre-built <SignIn /> components and a middleware-based session check that handles multi-session management out of the box.

Implement for projects requiring open-source flexibility. Use the 'Database Session' strategy with the Prisma Adapter to maintain full control over user data in your own PostgreSQL instance.

A database-agnostic library that handles session management without a heavy framework. Best for developers who want to manage their own database schemas while avoiding the complexities of low-level crypto.

Leverage Supabase's built-in GoTrue server. Use PostgreSQL Row Level Security (RLS) to automatically filter data based on the `auth.uid()` of the requesting user.

Integrate WorkOS when moving upmarket. It abstracts complex SAML and SCIM integrations into a single API, allowing connection to providers like Okta and Azure AD.

Utilize for high-scale mobile and web apps. Use the Admin SDK on the backend to verify ID tokens and manage custom user claims for basic role-based access.

Deploy Kratos for a self-hosted, cloud-native identity server. It separates identity management from the UI, requiring you to build your own login/registration flows via API.

A robust Java-based solution for enterprise environments. Supports OIDC, SAML, and Social Login with extensive management consoles for complex LDAP integrations.

The legacy standard for Node.js. Use specific strategies like `passport-jwt` or `passport-google-oauth20` to modularize authentication logic in monolithic architectures.

An open-source identity management system built specifically for multi-tenancy. Use its 'Projects' and 'Roles' features to manage access across different customer organizations.

Define permissions in a central `ability.ts` file using CASL. This allows you to use the same logic for UI toggles and backend API enforcement.

Externalize authorization logic using Permit.io. It provides a UI for non-developers to manage roles while syncing policies to your local OPA (Open Policy Agent) instance.

Run Cerbos as a sidecar or service. Define stateless policies in YAML to handle complex context-aware permissions without bloating your application code.

Sync Stripe subscription status to your user profiles. Implement middleware that checks the `subscription_status` field before allowing access to premium features or API endpoints.

Model roles using an Enum and a join table for permissions. Use Prisma's `$use` middleware to automatically inject tenant IDs into every query for data isolation.

Use Oso's Polar language to define 'ReBAC' (Relationship-Based Access Control). Ideal for 'Folder > Document' style permissions where access is inherited.

Use the Organizations feature to handle B2B tenant switching. Developers can use the `useOrganization` hook to fetch context-specific data without manual filtering.

Customize the `session` and `jwt` callbacks in Auth.js config to include the `tenantId` or `role` in the client-side session object for immediate UI updates.

For high-compliance apps, use separate DB schemas per tenant. Implement a connection pooler that selects the schema based on the user's authenticated `org_id`.

Implement Attribute-Based Access Control by checking user metadata (e.g., department, location) against resource attributes during the request lifecycle.

Implement rotation logic where every time a new access token is requested, the old refresh token is invalidated. This mitigates the risk of stolen long-lived tokens.

Enforce Proof Key for Code Exchange (PKCE) for all OAuth flows, including server-side, to prevent authorization code injection attacks.

Protect auth endpoints (login, forgot password) using Upstash Redis and `@upstash/ratelimit` to prevent brute-force attacks in serverless environments.

Store session IDs or JWTs in cookies with `HttpOnly`, `Secure`, and `SameSite=Lax` flags to prevent XSS-based token theft.

Integrate SimpleWebAuthn to allow users to authenticate using biometric hardware, significantly reducing reliance on vulnerable passwords.

Use `iron-session` for encrypted, stateless, and signed cookies. It provides a session utility that works across Next.js API routes and Server Components.

Always validate the `iss` (issuer), `aud` (audience), and `exp` (expiration) claims using a library like `jose` when receiving tokens from external providers.

Apply Helmet.js to your Express or Fastify app to set headers like `Content-Security-Policy` and `X-Frame-Options` to prevent clickjacking and injection.

Add multi-factor authentication using `otplib` to generate and verify TOTP codes. Store the encrypted secret in your database, never in plain text.

Use per-user usage tracking in your auth middleware to limit OpenAI/Anthropic API calls, preventing a single authenticated user from draining your credits.