Extract a value from a JSON payload that contains a dot in the key name using the JQ command line tool

jq.sh

# the leading '.' in the dockerconfigfile key we are interested in 
# makes the syntax harder then it should be, pay attention to the syntax used here

kubectl get secret/regcred -o json | jq -r '.data[".dockerconfigjson"]' | base64 -d

# OR

kubectl get secret/regcred -o jsonapath="{.data.\.dockerconfigjson}" | base64 -d