JWK

A JWK is a JSON data structure that represents a cryptographic key, defined in RFC 7517 as part of the JOSE family alongside JWS, JWE, and JWT. It standardizes how key type, algorithm, usage, and key material are expressed so systems can exchange keys over the web. OpenID Connect and OAuth providers publish their public signing keys as a JWK Set at a well-known URL, which is how clients verify token signatures.