jq

• piping jq to less with colour:

jq -C . data.json |less -R

• piping streaming output to jq:

(echo 'asdf {"type":"stats"}'; sleep 1 ) | cut -f 2 -d ' ' | jq --unbuffered .

• loop over dict and get list of item keys which match a pattern:

kubectl get secret secretname -n namespace -o json \
  | jq -r '.metadata.annotations | with_entries(select(.key|match("certmanager.k8s.io")))' \
  | jq -r '. | keys[]'