OAuth 2.0 Client Credentials Grant Type

oauth.net/2/grant-types/client-credentials/

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OAuth 2.0 Client Credentials Grant

tools.ietf.org/html/rfc6749#section-1.3.4

The Client Credentials grant type is used by clients to obtain an access token outside of the context of a user.

This is typically used by clients to access resources about themselves rather than to access a user's resources.

More resources

Client Credentials (oauth.com)
Application Access (aaronparecki.com)
Secure a Node API with OAuth 2.0 Client Credentials (developer.okta.com)