advancedOAuth2 & OpenID Connect Deep Dive

When would you use the Client Credentials grant instead of Authorization Code?

Client Credentials is used for machine-to-machine communication where there is no end-user involved at all — e.g., a backend batch job or one microservice calling another. The calling service authenticates as ITSELF using its own client_id/client_secret, receiving a token representing the service, not any particular user.

Ready to master this question?

Generate a complete walkthrough — background, the full answer in plain language, a working code example explained line by line, a real-world scenario, common mistakes, and how this same question gets asked in different ways.

Next Step

Continue to How does a resource server validate a JWT access token without calling the Authorization Server on every request? →← Back to all Spring Security questions