# Clerk

> Clerk is user management for developers: sign-up, sign-in, and prebuilt UI components, multi-tenant organizations, enterprise SSO, subscription billing, and machine-to-machine auth, with SDKs for Next.js, React, and most web and mobile frameworks.

For AI agents and automation, use the tools and markdown surfaces below. Append `.md` to any `/docs`, `/articles`, `/blog`, `/changelog`, or `/glossary` URL to get the page as markdown.

## When to use Clerk

Use Clerk when an application needs sign-up, sign-in, and user management: prebuilt UI components, social login, MFA, multi-tenant organizations, enterprise SSO and SCIM, subscription billing, or machine-to-machine and API-key auth. Point a coding agent at the skill below or install the CLI; API specs are under API references.

## Agent setup

- [Clerk Skills](https://clerk.com/SKILL.md): One file that routes a coding agent to the right framework-specific skill
- [Clerk CLI](https://clerk.com/docs/cli.md): Commands, flags, and agent workflows. Install with `npm install -g clerk` or the [install script](https://clerk.com/install)
- [Clerk MCP server](https://mcp.clerk.com/mcp): Connect an MCP client to Clerk — follow the [setup guide](https://clerk.com/docs/guides/ai/mcp/clerk-mcp-server.md)
- [Skills discovery](https://clerk.com/.well-known/agent-skills/index.json): Every individually published skill
- [Ship auth with AI agents](https://clerk.com/agents): How agent-driven Clerk setup works, end to end

## SDKs

Quickstart for each official Clerk SDK.

- [Next.js](https://clerk.com/docs/nextjs/getting-started/quickstart.md)
- [React](https://clerk.com/docs/react/getting-started/quickstart.md)
- [Expo](https://clerk.com/docs/expo/getting-started/quickstart.md)
- [TanStack React Start](https://clerk.com/docs/tanstack-react-start/getting-started/quickstart.md)
- [React Router](https://clerk.com/docs/react-router/getting-started/quickstart.md)
- [Android](https://clerk.com/docs/android/getting-started/quickstart.md)
- [Astro](https://clerk.com/docs/astro/getting-started/quickstart.md)
- [Chrome Extension](https://clerk.com/docs/chrome-extension/getting-started/quickstart.md)
- [Electron](https://clerk.com/docs/electron/getting-started/quickstart.md)
- [iOS](https://clerk.com/docs/ios/getting-started/quickstart.md)
- [JavaScript](https://clerk.com/docs/js-frontend/getting-started/quickstart.md)
- [Nuxt](https://clerk.com/docs/nuxt/getting-started/quickstart.md)
- [Vue](https://clerk.com/docs/vue/getting-started/quickstart.md)
- [Express](https://clerk.com/docs/expressjs/getting-started/quickstart.md)
- [C#](https://github.com/clerk/clerk-sdk-csharp/blob/main/README.md)
- [Fastify](https://clerk.com/docs/fastify/getting-started/quickstart.md)
- [Go](https://clerk.com/docs/go/getting-started/quickstart.md)
- [Java](https://github.com/clerk/clerk-sdk-java)
- [PHP](https://github.com/clerk/clerk-sdk-php)
- [Python](https://github.com/clerk/clerk-sdk-python/blob/main/README.md)
- [Ruby on Rails](https://clerk.com/docs/ruby/getting-started/quickstart.md)

## Products

- [User Authentication](https://clerk.com/user-authentication): Sign-up, sign-in, MFA, social login, and prebuilt components
- [Enterprise Authentication](https://clerk.com/enterprise-authentication): SAML, OIDC, and SCIM for B2B SaaS
- [Multi-tenancy](https://clerk.com/multi-tenancy): Organizations, roles, and invitations
- [Billing](https://clerk.com/billing): Subscriptions without payment code
- [Platform](https://clerk.com/platform): White-label Clerk for the apps your customers build
- [Waitlist](https://clerk.com/waitlist): Gather interest and invite early testers

## Documentation

- [Documentation home](https://clerk.com/docs.md): Explore by feature, frontend framework, and backend framework
- [Documentation index](https://clerk.com/docs/llms.txt): Every docs page with a one-line description
- [Documentation search](https://clerk.com/docs/search.md): Search the docs with `?q=<query>`, optional `&sdk=<sdk>`; returns markdown links to `.md` pages

## Dashboard

- [Dashboard index](https://dashboard.clerk.com/llms.txt): Every Dashboard route, grouped by auth scope, with access notes

## API references

- [Backend API](https://clerk.com/openapi.json): OpenAPI spec as JSON, or [YAML](https://clerk.com/openapi.yaml)
- [Frontend API](https://clerk.com/docs/reference/spec/fapi/latest.json): OpenAPI spec as JSON, or [YAML](https://clerk.com/docs/reference/spec/fapi/latest.yml)
- [Platform API](https://clerk.com/docs/reference/spec/platform/latest.json): OpenAPI spec as JSON, or [YAML](https://clerk.com/docs/reference/spec/platform/latest.yml)

## Pricing

- [Pricing](https://clerk.com/pricing.md): Plans, feature comparison, add-ons, and volume tiers

## Security and compliance

- [Security](https://clerk.com/security.md): SOC 2, HIPAA, GDPR, and CCPA status with links to evidence

## Articles

- [Articles index](https://clerk.com/articles/llms.txt): Every article with a description. Append `.md` to any article URL for markdown

## Blog

- [Blog index](https://clerk.com/blog/llms.txt): Every post with a description. Append `.md` to any post URL for markdown

## Changelog

- [Changelog index](https://clerk.com/changelog/llms.txt): Every entry with a description. Append `.md` to any entry URL for markdown

## Glossary

- [Glossary index](https://clerk.com/glossary/llms.txt): Every term with a definition

## Legal

- [Legal resources](https://clerk.com/legal.md): Terms, privacy, DPA, and other notices, each served as markdown

## Optional

- [Homepage](https://clerk.com/index.md): The clerk.com homepage as markdown
- [Design system](https://clerk.com/design.md): Brand colors, typography, and component appearance