$ kubectl create serviceaccount testserviceaccount -n default
$ kubectl describe secret testserviceaccount-token-xnsvx
Name:         testserviceaccount-token-xnsvx
Namespace:    default
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: testserviceaccount
              kubernetes.io/service-account.uid: b45a08c2-d385-412b-9505-6bdf87b64a7a
Type:  kubernetes.io/service-account-token
Data
====
ca.crt:    1025 bytes
namespace: 7 bytes
token: eyJhbGciOiJSUzI1NiIsImtpZCI6InNCRjdsTmJHeGVoUTdGR0ZTemsyalpCaGhqclhoQjVBLXdpZnVxdVNDbXcifQ.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.SO9XwM3zgiW6sOfEaJx1P6m1lFdsDj9IgBCogkKgg-b8pYm4wErq9a6ZSyR6Z5E3sdG4Djkc4Gnfs4oxBncl3IpDQSNVjL6ahtPMtlrKq3ssbzvlbDSsoyJDp568O2RzuaqSP_Zy8Kmm9ddaBKUQ46DUfvLw-7MVgUf-_IY8vuaAXCCBvgeJCIpJf0_IWuBQ2uWh-0JtEZwu7OCrVO2B51bvTuXbB7lbYZvnpIJT8umBSjvoA0G78OnawY0tHtycAXedCx8UuY7DET3UQio-31vNOQQ0wKBVUlCw-9ASKX112ZKvbkzbp1ZP8MG-BgMoWJoqFdrErv2Nvo1pN85vTA