Zitadel setup guide

This guide walks you through setting up Zitadel authentication for your FastAPI application.

Project configuration

In your Zitadel console:

1. Create New Project, named Demo project

2. After saving, in the project overview, under General, tick:

   1. Assert Roles on Authentication
   2. Check authorization on Authentication

3. Under Roles, create a new role (e.g., key = admin)

4. Record the Project Id ("Resource Id") from the project overview. You'll need this for the ZitadelAuth object's project_id parameter.

Applications

The project requires (at least) two applications:

1. An API application for service-to-service authentication
2. A User Agent application for human authentication via Swagger UI

Application 1: API

Create an API application for service authentication:

1. In the project overview, create a New Application:

   1. Type: API
   2. Name: Demo API (or your preferred name)
   3. Authentication Method: Private Key JWT

2. After saving, record the Issuer URL from the app overview under URLs (e.g., https://myinstance.zitadel.cloud). You'll need this for the ZitadelAuth object's issuer_url parameter.

Application 2: User Agent

Create a User Agent application to enable Swagger UI authentication:

1. In the project overview, create a New Application:

   1. Type: User Agent
   2. Name: Swagger UI (or your preferred name)
   3. Authentication Method: PKCE
   4. Redirect URI: http://localhost:8001/oauth2-redirect (or your FastAPI app URL + /oauth2-redirect)
   5. Toggle Development Mode for non-HTTPS redirects

2. After saving, go to the app's Token Settings:

   1. Set "Auth Token Type" to JWT
   2. Enable Add user roles to access token
   3. Enable User roles inside ID token

3. Record the client Id from the overview. You'll need this for the ZitadelAuth object's app_client_id parameter.

Users

Create two user accounts with the admin role (or your chosen role):

1. A human user for interactive access
2. A service user for automated processes

For more information, see Zitadel user types.

User 1: Human User

1. Create a New User:

   1. Name: Admin User (or your preferred name)
   2. Enable Email Verified for testing

2. Under Authorizations:

   1. Create new authorization
   2. Select your project (e.g., "Demo Project")
   3. Assign your role (e.g., admin)

User 2: Service User

1. Create a New Service User:

   1. Username: Admin Bot (or your preferred name)
   2. Access Token Type: JWT

2. Under Authorizations:

   1. Create new authorization
   2. Select your project (e.g., "Demo Project")
   3. Assign your role (e.g., admin)

3. Under Keys:

   1. Create a new JSON key
   2. Download and secure the key file
   3. Update the key file path in demo_project/service_user.py