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zitadel/apps/docs/content/sdk-examples/sveltekit.mdx
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d8ea041c56 docs: introduce versioned docs and migrate to fuma (#11166)
## Todos for release

- [x] Configure Env in docs project on vercel
- [x] Configure Root Path in the docs project on vercel
- [ ] Remove old CSP https://github.com/zitadel/website/pull/1592

## What we did

This pull request migrates the project documentation from the old
`docs/` directory to the new `apps/docs/` directory, introduces a new
documentation system built with Next.js and Fumadocs, and updates all
relevant references, configuration files, and documentation to reflect
this change. It also adds new configuration and ignore files for the new
documentation app, updates CI and linting to exclude the new docs from
certain checks, and revises the contributing guidelines accordingly.

**Documentation System Migration and New Docs App**

* Migrated all documentation from `docs/` to `apps/docs/`, and updated
all references in `README.md`, `CONTRIBUTING.md`, and other files to
point to the new location.
[[1]](diffhunk://#diff-eca12c0a30e25b4b46522ebf89465a03ba72a03f540796c979137931d8f92055L585-L640)
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[[5]](diffhunk://#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L30-R30)
* Added a new Next.js/Fumadocs-based documentation app under
`apps/docs/`, including core app files, layouts, routing, search API,
and a comprehensive `README.md` with development and contribution
instructions.
[[1]](diffhunk://#diff-5a1b07344a2c1b4d3f37b23ff1388b62cd9f57dea3c1cd23d8a0412b7602b132R1-R74)
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[[3]](diffhunk://#diff-e16ae25660ded787b10ac35dea96d5ecaacf895dae0afc8a9bd4382dc79a8c87R1-R7)
[apps/docs/app/[[...slug]]/layout.tsxR1-R81](diffhunk://#diff-59e08acde4e805b7aeccef1dcf98f1d71dfc550777e6b9402085cee0e9fa4e0aR1-R81),
[apps/docs/app/[[...slug]]/page.tsxR1-R79](diffhunk://#diff-e5df3f80d0fa01e12d63d81f29c57a9d14e846c78fd3beabb2ef768e38fd9580R1-R79),
[[4]](diffhunk://#diff-389b34918e040cacaa87cd7201ffa462cc2b0b716736f537e3d3c660ac69353bR1-R7)
[[5]](diffhunk://#diff-d3b03416d1c457b19f1c27b26f2db741412df841b875c26ccadc36e4522247f4R1-R29)
[[6]](diffhunk://#diff-c8fb8339570a5305809be7c618e14705fd86390dc278e6ce8ba224a7bc8b0c3cR1-R25)

**Configuration and Tooling Updates**

* Updated `.github/workflows/codeql.yml`, `.golangci.yaml`, and
`.github/dependabot.yml` to properly handle the new docs app: excluded
`apps/docs` from certain checks, added npm dependency updates for the
docs app, and excluded generated content.
[[1]](diffhunk://#diff-12783128521e452af0cfac94b99b8d250413c516ec71fe6d97dbea666ff7ba27L8-R14)
[[2]](diffhunk://#diff-9917ddc9f1c3304218f7269265b746d997c5c0615478177b5fceecd33ef47cb5R5-R6)
[[3]](diffhunk://#diff-9917ddc9f1c3304218f7269265b746d997c5c0615478177b5fceecd33ef47cb5R126-R129)
[[4]](diffhunk://#diff-dd4fbda47e51f1e35defb9275a9cd9c212ecde0b870cba89ddaaae65c5f3cd28R89-R106)
* Updated `.devcontainer/devcontainer.json` to use the latest Go 1.25.3
version for consistency.

**Licensing and Miscellaneous**

* Added `apps/docs/` to the list of licensed directories in
`LICENSING.md`.

These changes ensure the documentation is now maintained in a modern,
scalable system and all project tooling is updated to support the new
structure.

---------

Co-authored-by: Federico Coppede <[email protected]>
2026-01-29 08:38:36 -08:00

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---
title: SvelteKit
sidebar_label: SvelteKit
framework_url: https://kit.svelte.dev
auth_library: "@auth/core"
auth_library_url: https://www.npmjs.com/package/@auth/core
example_repo: https://github.com/zitadel/example-auth-sveltekit
auth_flow: pkce
status: stable
---
## Overview
[SvelteKit](https://kit.svelte.dev) is a framework for building web applications with flexible filesystem-based routing and a unified approach to server-side and client-side logic. This example demonstrates how to integrate **Zitadel** using the **[OAuth 2.0 PKCE flow](https://oauth.net/2/pkce/)** to authenticate users securely and maintain sessions across your application.
#### Auth library
This example uses **[@auth/sveltekit](https://www.npmjs.com/package/@auth/sveltekit)**, the SvelteKit integration of **[@auth/core](https://www.npmjs.com/package/@auth/core)** (formerly NextAuth.js). Auth.js provides a complete authentication solution that handles the [OpenID Connect](https://zitadel.com/docs/apis/openidoauth/endpoints) protocol, manages [PKCE](https://oauth.net/2/pkce/) code generation and verification, performs secure token exchange, and provides session management utilities across your SvelteKit application.
---
## What this example demonstrates
This example provides a complete authentication implementation showing how to secure a [SvelteKit](https://kit.svelte.dev) application with [Zitadel](https://zitadel.com/docs). Users start on a public landing page and click a login button to authenticate through Zitadel's [authorization server](https://zitadel.com/docs/apis/openidoauth/endpoints) using the **[PKCE flow](https://oauth.net/2/pkce/)**. After successful authentication, they're redirected to a protected profile page that displays their [user information and claims](https://zitadel.com/docs/apis/openidoauth/claims).
The example demonstrates route protection using [SvelteKit's server-side load functions](https://kit.svelte.dev/docs/load) that verify [session state](https://zitadel.com/docs/apis/openidoauth/endpoints#token_endpoint) before rendering protected pages. Authentication state is managed through [@auth/sveltekit hooks](https://kit.svelte.dev/docs/load) that verify [session state](https://zitadel.com/docs/apis/openidoauth/endpoints#token-endpoint) before rendering protected pages. Authentication state is managed through [@auth/sveltekit hooks](https://www.npmjs.com/package/@auth/sveltekit), which integrate with [SvelteKit's hooks system](https://kit.svelte.dev/docs/load) that verify [session state](https://zitadel.com/docs/apis/openidoauth/endpoints#token-endpoint) before rendering protected pages. Authentication state is managed through [@auth/sveltekit hooks](https://www.npmjs.com/package/@auth/sveltekit), which integrate with [SvelteKit's hooks system](https://kit.svelte.dev/docs/hooks) to provide session data throughout your application. The implementation includes automatic [access token refresh](https://kit.svelte.dev/docs/load) that verify [session state](https://zitadel.com/docs/apis/openidoauth/endpoints#token-endpoint) before rendering protected pages. Authentication state is managed through [@auth/sveltekit hooks](https://www.npmjs.com/package/@auth/sveltekit), which integrate with [SvelteKit's hooks system](https://kit.svelte.dev/docs/hooks) to provide session data throughout your application. The implementation includes automatic [access token refresh](https://zitadel.com/docs/apis/openidoauth/grant-types#refresh-token) to maintain long-lived sessions without requiring users to re-authenticate.
The logout flow implements **[federated logout](https://zitadel.com/docs/guides/integrate/login/oidc/logout)** with proper CSRF protection, terminating both the local application session and the Zitadel session before redirecting users back to your application. Custom error pages provide user-friendly messages for authentication failures, and the example includes comprehensive security headers configured through [SvelteKit's hooks](https://kit.svelte.dev/docs/hooks).
---
## Getting started
### Prerequisites
Before running this example, you need to create and configure a PKCE application in the [ZITADEL Management Console](https://zitadel.com/docs/guides/manage/console/overview). Follow the PKCE application setup guide to:
1. Create a new Web application in your [Zitadel project](https://zitadel.com/docs/guides/manage/console/projects)
2. Configure it to use the PKCE authentication method
3. Set up your redirect URIs (e.g., `http://localhost:3000/auth/callback` for development)
4. Configure post-logout redirect URIs (e.g., `http://localhost:3000/auth/logout/callback`)
5. Copy your **Client ID** for use in the next steps
> **Note:** Make sure to enable **Dev Mode** in the [ZITADEL Management Console](https://zitadel.com/docs/guides/manage/console/overview) if you're using HTTP URLs during local development. For production, always use HTTPS URLs and disable Dev Mode.
### Run the example
Once you have your Zitadel application configured:
1. Clone the [repository](https://github.com/zitadel/example-auth-sveltekit).
2. Create a `.env.local` file in the project root and configure it with the values from your [Zitadel application](https://zitadel.com/docs/guides/manage/console/applications). **Use these exact environment variable names:**
```
SESSION_SECRET=your-very-secret-and-strong-session-key
SESSION_DURATION=3600
ZITADEL_DOMAIN=https://your-instance.zitadel.cloud
ZITADEL_CLIENT_ID=your_client_id_from_console
ZITADEL_CLIENT_SECRET=your-randomly-generated-client-secret
ZITADEL_CALLBACK_URL=http://localhost:3000/auth/callback
ZITADEL_POST_LOGOUT_URL=http://localhost:3000/auth/logout/callback
NEXTAUTH_URL=http://localhost:3000
```
Replace these values with:
- A secure random string for `SESSION_SECRET` (generate using: `node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"`)
- Your actual Zitadel instance URL for `ZITADEL_DOMAIN` (the issuer URL)
- The **Client ID** you copied when creating the application
- A random string for `ZITADEL_CLIENT_SECRET` (Auth.js requires this even though PKCE doesn't strictly need it)
- The **redirect URI** you configured in the PKCE setup (must match exactly)
- The **post-logout redirect URI** you configured
3. Install dependencies using [npm](https://www.npmjs.com) and start the development server:
```bash
npm install
npm run dev
```
4. Navigate to `http://localhost:3000` to verify the authentication flow end-to-end.
---
## Learn more and resources
* [PKCE concept](https://oauth.net/2/pkce/)
* [Federated logout](https://zitadel.com/docs/guides/integrate/login/oidc/logout)
* [OIDC integration guide](https://zitadel.com/docs/guides/integrate/login/oidc/login-users)
* [SvelteKit documentation](https://kit.svelte.dev)
* [Auth.js (SvelteKit)](https://www.npmjs.com/package/@auth/sveltekit)
* [Auth.js Core](https://www.npmjs.com/package/@auth/core)
* [Example repository](https://github.com/zitadel/example-auth-sveltekit)