Do Keycloak Clients have a Client Secret?
Your client need to have the access-type set to confidential , then you will have a new tab credentials where you will see the client secret.
https://wjw465150.gitbooks.io/keycloak-documentation/content/server_admin/topics/clients/oidc/confidential.html
Client need to have the access-type set to confidential and you can see the client Secret in credentials tab 
Does keycloak client id has a client secret? I tried to create a client in keycloak admin but I was not able to spot client secret.
First, you should know that Keycloak implements OpenID Connect, which
is a simple identity layer on top of the OAuth 2.0 protocol.
According to the OAuth 2.0 protocol clients can be either confidential or public.
The main difference relates to whether or not the application is able to hold credentials (such as a client ID and secret) securely.
Regarding the confidential clients:
Because they use a trusted backend server, confidential applications can use grant types that require them to authenticate by specifying their client ID and client secret when calling the Token endpoint.
Armed with this knowledge you can easily create a client that will have a client secret as follows:
- Create a client with "Access Type" set to confidential:
- Click the Save button;
- Afterwards a new tab named "Credentials" will show up :
- And there you can see the client secret:
