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# Which Problems Are Solved
When deploying the login application behind proxies or using Vercel
rewrites (e.g., `zitadel.com/login` → `login-zitadel-qa.vercel.app`),
the application was using the internal rewritten host instead of the
original user-facing host. This caused several issues:
1. **Broken Password Reset Emails**: Email links contained internal
hosts like `login-zitadel-qa.vercel.app` instead of `zitadel.com`
2. **Inconsistent User Experience**: Users would see different domains
in various parts of the flow
3. **Security Concerns**: Internal infrastructure details were exposed
to end users
4. **Scattered Logic**: Host detection logic was duplicated across
multiple files with inconsistent error handling
# How the Problems Are Solved
Created comprehensive host detection utilities in `/lib/server/host.ts`
and `/lib/client/host.ts`:
**Server-side utilities:**
- `getOriginalHost()` - Returns the original user-facing host
- `getOriginalHostWithProtocol()` - Returns host with proper protocol
(http/https)
(cherry picked from commit 09d09ab337)
Are you searching for a user management tool that is quickly set up like Auth0 and open source like Keycloak?
Do you have a project that requires multi-tenant user management with self-service for your customers?
Look no further — ZITADEL is the identity infrastructure, simplified for you.
We provide you with a wide range of out-of-the-box features to accelerate your project, including:
✅ Multi-tenancy with team management
✅ Secure login
✅ Self-service
✅ OpenID Connect
✅ OAuth2.x
✅ SAML2
✅ LDAP
✅ Passkeys / FIDO2
✅ OTP
✅ SCIM 2.0 Server
and an unlimited audit trail is there for you, ready to use.
With ZITADEL, you are assured of a robust and customizable turnkey solution for all your authentication and authorization needs.
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Deploying ZITADEL locally takes less than 3 minutes. Go ahead and give it a try!
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Setup ZITADEL Cloud (SaaS)
If you want to experience a hands-free ZITADEL, you should use ZITADEL Cloud. Available data regions are:
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Example applications
Clone one of our example applications or deploy them directly to Vercel.
SDKs
Use our SDKs for your favorite language and framework.
Why choose ZITADEL
We built ZITADEL with a complex multi-tenancy architecture in mind and provide the best solution to handle B2B customers and partners. Yet it offers everything you need for a customer identity (CIAM) use case.
- API-first approach
- Multi-tenancy authentication and access management
- Strong audit trail thanks to event sourcing as storage pattern
- Actions to react on events with custom code and extended ZITADEL for you needs
- Branding for a uniform user experience across multiple organizations
- Self-service for end-users, business customers, and administrators
- Postgres database as reliable and widespread storage option
Features
Authentication
- Single Sign On (SSO)
- Passkeys support (FIDO2 / WebAuthN)
- Username / Password
- Multifactor authentication with OTP, U2F, Email OTP, SMS OTP
- LDAP
- External enterprise identity providers and social logins
- Device authorization
- OpenID Connect certified => OIDC Endpoints
- SAML 2.0 => SAML Endpoints
- Custom sessions if you need to go beyond OIDC or SAML
- Machine-to-machine with JWT profile, Personal Access Tokens (PAT), and Client Credentials
- Token exchange and impersonation
- Beta: Hosted Login V2 our new login version 2.0
Multi-Tenancy
- Identity Brokering with templates for popular identity providers
- Customizable onboaring for B2B and their users
- Delegate role management to third-parties
- Domain discovery
Integration
- GRPC and REST APIs for every functionality and resource
- Actions to call any API, send webhooks, adjust workflows, or customize tokens
- Role Based Access Control (RBAC)
- SCIM 2.0 Server
- Examples and SDKs
- Audit Log and SOC/SIEM
- User registration and onboarding
- Hosted and custom login user interface
Self-Service
- Self-registration including verification
- Self-service for end-users, business customers, and administrators
- Administration UI (Console)
Deployment
- Postgres (version >= 14)
- Zero Downtime Updates
- High scalability
Track upcoming features on our roadmap and follow our changelog for recent updates.
How To Contribute
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Contributors
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Showcase
Quick Start Guide
Secure a React Application using OpenID Connect Authorization Code with PKCE
Login with Passkeys
Use our login widget to allow easy and secure access to your applications and enjoy all the benefits of Passkeys (FIDO 2 / WebAuthN):
Admin Console
Use Console or our APIs to setup organizations, projects and applications.
Login V2
Check out our new Login V2 version in our typescript repository or in our documentation
Security
You can find our security policy here.
Technical Advisories are published regarding major issues with the ZITADEL platform that could potentially impact security or stability in production environments.
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See our license for detailed information governing permissions and limitations on use.