--- source_url: "https://clerk.com/docs" title: "Welcome to Clerk Docs | Clerk Docs" mirrored_at: 2026-08-30T03:02:03.828Z host: clerk.com cited_in_42a: true mirror_canonical: "https://index.42a.ai/clerk.com/docs" --- > **Original source:** https://clerk.com/docs Clerk provides full-stack authentication and user management with products such as Organizations, Billing, and more. Have your agent use Clerk's [CLI](https://clerk.com/docs/cli) and [Skills](https://clerk.com/docs/guides/ai/skills) to get started, or explore the resources below. Build with agents Add Clerk auth to my app: clerk.com/SKILL.md ## [Quickstarts & Tutorials](https://clerk.com/docs/getting-started/quickstart/overview) Explore our end-to-end tutorials and getting started guides for different application stacks using Clerk. ## [UI Components](https://clerk.com/docs/reference/components/overview) Clerk's prebuilt UI components give you a beautiful, fully-functional user management experience in minutes. ## [SDK Reference](https://clerk.com/docs/reference/overview) Dig into our SDK reference documentation. We have everything you need to get started setting up authentication with Clerk. ## [Customizing Clerk](https://clerk.com/docs/guides/customizing-clerk/appearance-prop/overview) Customize Clerk's UI components, email templates, and other aspects of the user experience to match your application's branding and user interface. ## [Quickstarts & Tutorials](https://clerk.com/docs/getting-started/quickstart/overview) Explore our end-to-end tutorials and getting started guides for different application stacks using Clerk. ## [Views](https://clerk.com/docs/reference/views/overview) Clerk's prebuilt Views give you a beautiful, fully-functional user management experience in minutes. ## [SDK Reference](https://clerk.com/docs/reference/overview) Dig into our SDK reference documentation. We have everything you need to get started setting up authentication with Clerk. ## [Customizing Clerk](https://clerk.com/docs/guides/customizing-clerk/clerk-theme) Customize Clerk's views, email templates, and other aspects of the user experience to match your application's branding and user interface. ## [Explore by feature](#explore-by-feature) ### [Authentication](https://clerk.com/docs/guides/configure/auth-strategies/sign-up-sign-in-options) Clerk supports multiple authentication strategies so you can implement the strategy that makes sense for your users. ### [User management](https://clerk.com/docs/guides/users/managing) Complete user management. Add sign up, sign in, and profile management to your application in minutes. ### [Organizations](https://clerk.com/docs/guides/organizations/overview) Organizations are shared accounts, useful for project and team leaders. Members with elevated privileges can manage member access to the Organization's data and resources. ### [Billing](https://clerk.com/docs/guides/billing/overview) Set up and manage Billing for B2C and B2B applications, including free trials, Subscription Plans, payments, and webhook events. ### [Waitlist](https://clerk.com/docs/guides/secure/waitlist) Collect signups and control access to new features or products before launch, with a simple, integrated workflow for developers. ## [Explore by frontend framework](#explore-by-frontend-framework) ### [Next.js](https://clerk.com/docs/nextjs/getting-started/quickstart) Easily add secure, beautiful, and fast authentication to Next.js with Clerk. ### [React](https://clerk.com/docs/react/getting-started/quickstart) Get started installing and initializing Clerk in a new React + Vite app. ### [Expo](https://clerk.com/docs/expo/getting-started/quickstart) Use Clerk with Expo to authenticate users in your React Native application. ### [TanStack React Start](https://clerk.com/docs/tanstack-react-start/getting-started/quickstart) Easily add secure and SSR-friendly authentication to your TanStack React Start application with Clerk. ### [React Router](https://clerk.com/docs/react-router/getting-started/quickstart) Easily add secure, edge- and SSR-friendly authentication to React Router with Clerk. ### [Android](https://clerk.com/docs/android/getting-started/quickstart) Use the Clerk Android SDK to authenticate users in your native Android applications. ### [Astro](https://clerk.com/docs/astro/getting-started/quickstart) Easily add secure and SSR-friendly authentication to your Astro application with Clerk. ### [Chrome Extension](https://clerk.com/docs/chrome-extension/getting-started/quickstart) Use the Chrome Extension SDK to authenticate users in your Chrome extension. ### [iOS](https://clerk.com/docs/ios/getting-started/quickstart) Use the Clerk iOS SDK to authenticate users in your native Apple applications. ### [JavaScript](https://clerk.com/docs/js-frontend/getting-started/quickstart) The Clerk JavaScript SDK gives you access to prebuilt components and helpers to make user authentication easier. ### [Nuxt](https://clerk.com/docs/nuxt/getting-started/quickstart) Easily add secure, beautiful, and fast authentication to Nuxt with Clerk. ### [Vue](https://clerk.com/docs/vue/getting-started/quickstart) Get started installing and initializing Clerk in a new Vue + Vite app. ## [Explore by backend framework](#explore-by-backend-framework) ### [Express](https://clerk.com/docs/expressjs/getting-started/quickstart) Quickly add authentication and user management to your Express application. ### [C#](https://github.com/clerk/clerk-sdk-csharp/blob/main/README.md) The Clerk C# SDK is a wrapper around our Backend API to make it easier to integrate Clerk into your backend. ### [Fastify](https://clerk.com/docs/fastify/getting-started/quickstart) Build secure authentication and user management flows for your Fastify server. ### [Go](https://clerk.com/docs/go/getting-started/quickstart) The Clerk Go SDK is a wrapper around the Backend API written in Golang to make it easier to integrate Clerk into your backend. ### [Java](https://github.com/clerk/clerk-sdk-java) The Clerk Java SDK is a wrapper around the Backend API to make it easier to integrate Clerk into your backend. ### [PHP](https://github.com/clerk/clerk-sdk-php) The Clerk PHP SDK is a wrapper around the Backend API to make it easier to integrate Clerk into your backend. ### [Python](https://github.com/clerk/clerk-sdk-python/blob/main/README.md) The Clerk Python SDK is a wrapper around the Backend API written in Python to make it easier to integrate Clerk into your backend. ### [Ruby on Rails](https://clerk.com/docs/ruby/getting-started/quickstart) Integrate authentication and user management into your Ruby application. ## [Build with community-maintained SDKs](#build-with-community-maintained-sdks) ### [Angular](https://github.com/anagstef/ngx-clerk?tab=readme-ov-file#ngx-clerk) Visit the community-maintained repository to learn how to integrate Clerk into your Angular application. ### [Elysia](https://github.com/wobsoriano/elysia-clerk) Visit the community-maintained plugin for integrating Clerk with Elysia. ### [Flutter](https://docs.page/clerk-community/clerk-sdk-flutter) Visit the community-maintained documentation to learn how to integrate Clerk into your Flutter application. ### [Hono](https://github.com/honojs/middleware/tree/main/packages/clerk-auth) Visit the community-maintained repository to learn how to integrate Clerk into your Hono application. ### [Koa](https://github.com/dimkl/clerk-koa/blob/main/README.md) Visit the community-maintained repository to learn how to integrate Clerk into your Koa application. ### [Rust](https://github.com/DarrenBaldwin07/clerk-rs) Visit the community-maintained Rust SDK to integrate Clerk with Rust. ### [SolidJS](https://github.com/spiritledsoftware/clerk-solidjs) Visit the community-maintained repository to learn how to integrate Clerk into your SolidJS application. ### [Svelte](https://github.com/wobsoriano/svelte-clerk) Visit the community-maintained adapter for integrating Clerk with SvelteKit. ### [Tauri](https://github.com/Nipsuli/tauri-plugin-clerk) Visit the community-maintained plugin to learn how to integrate Clerk into your Tauri application. ## [Beyond the basics](#beyond-the-basics) ### [Securing your application](https://clerk.com/docs/guides/secure/overview) Enhance the security of your application with access control, authorization checks, session options, MFA, password policies, bot protection, and compliance tools. ### [Database integrations](https://clerk.com/docs/guides/development/integrations/overview) Enable Clerk-managed users to authenticate and interact directly with your database with Clerk's integrations. ### [Development](https://clerk.com/docs/guides/development/clerk-environment-variables) Build and maintain your app with environment management, custom auth flows, third-party integrations, testing, deployment, and API requests. ### [Clerk Dashboard](https://clerk.com/docs/guides/dashboard/overview) Configure your instance, manage settings, and monitor usage from the Clerk Dashboard. ### [SDKs](https://clerk.com/docs/reference/overview) Clerk's SDKs allow you to call the Clerk server API without having to implement the calls yourself. ### [How Clerk works](https://clerk.com/docs/guides/how-clerk-works/overview) Understand the underlying concepts and technologies that power Clerk, including authentication protocols, token management, and security practices. ## [Learn the concepts](#learn-the-concepts) ![What is Clerk authentication visual](https://clerk.com/_next/image?url=%2Fdocs%2Fraw%2F_public%2Fimages%2Fhome%2Fwhat-is-clerk.png&w=2048&q=75&dpl=dpl_DiBd3WWCMdGL3JjeDM5GREGUwTZT)![What is Clerk authentication visual](https://clerk.com/_next/image?url=%2Fdocs%2Fraw%2F_public%2Fimages%2Fhome%2Fwhat-is-clerk-dark.png&w=2048&q=75&dpl=dpl_DiBd3WWCMdGL3JjeDM5GREGUwTZT) ### [What is Clerk authentication?](https://clerk.com/docs/guides/configure/auth-strategies/sign-up-sign-in-options) Clerk offers multiple authentication strategies to identify legitimate users of your application, and to allow them to make authenticated requests to your backend. ![User object visual](https://clerk.com/_next/image?url=%2Fdocs%2Fraw%2F_public%2Fimages%2Fhome%2Fuser-object.png&w=2048&q=75&dpl=dpl_DiBd3WWCMdGL3JjeDM5GREGUwTZT)![User object visual](https://clerk.com/_next/image?url=%2Fdocs%2Fraw%2F_public%2Fimages%2Fhome%2Fuser-object-dark.png&w=2048&q=75&dpl=dpl_DiBd3WWCMdGL3JjeDM5GREGUwTZT) ### [What is the "User" object?](https://clerk.com/docs/guides/users/managing) The User object contains all account information that describes a user of your app in Clerk. Users can authenticate and manage their accounts, update their personal and contact info, or set up security features for their accounts. ![Organizations visual](https://clerk.com/_next/image?url=%2Fdocs%2Fraw%2F_public%2Fimages%2Fhome%2Forganizations.png&w=2048&q=75&dpl=dpl_DiBd3WWCMdGL3JjeDM5GREGUwTZT)![Organizations visual](https://clerk.com/_next/image?url=%2Fdocs%2Fraw%2F_public%2Fimages%2Fhome%2Forganizations-dark.png&w=2048&q=75&dpl=dpl_DiBd3WWCMdGL3JjeDM5GREGUwTZT) ### [How do Organizations work?](https://clerk.com/docs/guides/organizations/overview) Organizations allow members to collaborate across shared resources. Each member of an Organization needs to have a user account in your application. All Organization members have access to most of the Organization resources, but some members can take advantage of administrative features. ## [Join the Discord community](https://clerk.com/discord) Join the official Discord community to connect with other developers. Join Discord Join Discord ## [Need help?](https://clerk.com/contact/support) Contact the support team to get answers to your questions. Get help Get help