Keycloak public key is not base64url encoded

I copied public key from my realm settings and tried to validate in https://jwt.io. It says "Error: Looks like your JWT header is not encoded correctly using base64url". I am using the key to authenticate by sending it has client_assertion. Any help on how to get or generate correct JWT in Keycloak is so much appreciated

Header and Payload section is blank in jwt.io

Solution

I have written a Java program using JJWT library to generate JWT from the JKS file that is generated from Client-Keys-Generate new keys and certificate section and was able to validate JWT and signature in jwt.io

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