This end-point returns the public part of keys used for signing tokens (kun ID Token?). The keys are later used for token validations (add reference).
Example response from /jwk:
{
"keys":[
{
"kty":"RSA",
"n":"khw6L8E9GwwTu5AUclp (abbreviated ...) OM0MdzrKLLrmgiYVi",
"e":"AQAB",
"kid":"bankid-oauth",
"use":"sig"
}
]
}