Set application theme assignment
const url = 'http://localhost:8000/clusters/2489E9AD-2EE2-8E00-8EC9-32D5F69181C0/realms/customer-portal/applications/example/themes';
const options = {
method: 'PATCH',
headers: {
'API-Version': '2026-06-01.beta',
'API-Key': '<API-Key>',
'Content-Type': 'application/json'
},
body: '{"login":"2489E9AD-2EE2-8E00-8EC9-32D5F69181C0"}'
};
try {
const response = await fetch(url, options);
const data = await response.json();
console.log(data);
} catch (error) {
console.error(error);
}curl --request PATCH \
--url http://localhost:8000/clusters/2489E9AD-2EE2-8E00-8EC9-32D5F69181C0/realms/customer-portal/applications/example/themes \
--header 'API-Key: <API-Key>' \
--header 'API-Version: 2026-06-01.beta' \
--header 'Content-Type: application/json' \
--data '{ "login": "2489E9AD-2EE2-8E00-8EC9-32D5F69181C0" }'Assigns a deployed custom login theme to the application client. Setting login to null resets the client to the realm default.
Required scope: themes:write
Authorizations
Section titled “Authorizations”Parameters
Section titled “Parameters”Path Parameters
Section titled “Path Parameters”Keycloak realm name (not ID). Must start with a letter; allows letters, digits, and hyphens.
Example
customer-portalOAuth 2.0 client identifier. Used as the stable resource identifier in this API and in Keycloak realm URLs.
Header Parameters
Section titled “Header Parameters”Request Bodyrequired
Section titled “Request Bodyrequired”object
Theme to activate for this client’s login page. Set to null to reset to the realm default.
Example generated
{
"login": "2489E9AD-2EE2-8E00-8EC9-32D5F69181C0"
}Responses
Section titled “Responses”The request has succeeded.
Which custom theme is active for a Keycloak application client.
object
Active theme for this client’s login page. null when using the realm default.
Example generated
{
"login": "2489E9AD-2EE2-8E00-8EC9-32D5F69181C0"
}The server could not understand the request due to invalid syntax.
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}Access is unauthorized.
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}Access is forbidden.
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}The server cannot find the requested resource.
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}The target cluster is temporarily unavailable because an update or maintenance operation is in progress. The request was not applied and can be retried once the cluster returns to the available state; the Retry-After header carries a suggested delay in seconds.
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}Headers
Section titled “Headers”Client error
object
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com",
"errors": [
{
"field": "example",
"detail": "example",
"code": "example",
"value": "example"
}
]
}Client error
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}Headers
Section titled “Headers”Server error
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}Server error
RFC 9457 Problem Details object.
object
Example generated
{
"type": "https://example.com",
"title": "example",
"status": 1,
"detail": "example",
"instance": "https://example.com"
}