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zitadel/apps/docs/content/guides/integrate/token-introspection/basic-auth.mdx
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Wim Van LaerandGitHub 699ed17918 chore: rename configuration to settings (#11568)
# Which Problems Are Solved

naming inconsistencies: Configuration <-> Settings

# How the Problems Are Solved


# Additional Changes


# Additional Context

- Closes #11282
2026-02-18 14:25:42 +01:00

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---
title: Basic Authentication in ZITADEL
sidebar_label: Basic Authentication
---
import IntrospectionResponse from './_introspection-response.mdx';
This is a guide on how to secure your API using [Basic Authentication](/apis/openidoauth/authn-methods#client-secret-basic).
## Register the API in ZITADEL
1. Go to your project and click on the **New** button as shown below.
<img
src="/docs/img/guides/integrate/token-introspection-basic-auth-1.png"
width="75%"
alt="Register the API"
/>
2. Give a name to your application (Test API 2 is the name given below) and select type **API**.
<img
src="/docs/img/guides/integrate/token-introspection-basic-auth-2.png"
width="75%"
alt="Register the API"
/>
3. Select **Basic** as the authentication method and click **Continue**.
<img
src="/docs/img/guides/integrate/token-introspection-basic-auth-3.png"
width="75%"
alt="Register the API"
/>
4. Now review your settings and click **Create**.
<img
src="/docs/img/guides/integrate/token-introspection-basic-auth-4.png"
width="75%"
alt="Register the API"
/>
5. You will now see the API’s **Client ID** and the **Client Secret**. Copy them and click **Close**.
<img
src="/docs/img/guides/integrate/token-introspection-basic-auth-5.png"
width="75%"
alt="Register the API"
/>
6. When you click **URLs** on the left, you will see the relevant OIDC URLs. Note down the **issuer** URL, **token_endpoint** and **introspection_endpoint**.
<img
src="/docs/img/guides/integrate/token-introspection-basic-auth-6.png"
width="75%"
alt="Register the API"
/>
7. Also note down the **Resource ID** of your project.
<img
src="/docs/img/guides/integrate/token-introspection-basic-auth-7.png"
width="75%"
alt="Register the API"
/>
## Token introspection
With Basic Authentication, you will receive a Client ID and Client Secret for your API. Send your client_id and client_secret as a Basic Auth Header in the following format:
```
Authorization: "Basic " + base64( formUrlEncode(client_id) + ":" + formUrlEncode(client_secret) )
```
The request from the API to the introspection endpoint should be in the following format:
```bash
curl --request POST \
--url ${CUSTOM_DOMAIN}/oauth/v2/introspect \
--header 'Content-Type: application/x-www-form-urlencoded' \
--header 'Authorization: Basic {your_basic_auth_header}' \
--data token=VjVxyCZmRmWYqd3_F5db9Pb9mHR5fqzhn...
```
Here's an example of how this is done in Python code:
```python
def introspect_token(self, token_string):
url = ZITADEL_INTROSPECTION_URL
data = {'token': token_string, 'token_type_hint': 'access_token', 'scope': 'openid'}
auth = HTTPBasicAuth(API_CLIENT_ID, API_CLIENT_SECRET)
resp = requests.post(url, data=data, auth=auth)
resp.raise_for_status()
return resp.json()
```
## Introspection response
<IntrospectionResponse components={props.components} />
Follow this [tutorial](https://github.com/zitadel/examples-api-access-and-token-introspection/tree/main/api-basic-authentication) to learn how to register an API application using Basic Auth with ZITADEL and test it.