How to get key names from JSON using jq

Question

curl http://testhost.test.com:8080/application/app/version | jq \'.version\' | jq \'.[]\'

The above command outputs only the values as below:

Answer 1

To print keys on one line as csv:

echo '{"b":"2","a":"1"}' | jq -r 'keys | [ .[] | tostring ] | @csv'

Output:

"a","b"

For csv completeness ... to print values on one line as csv:

echo '{"b":"2","a":"1"}' | jq -rS . | jq -r '. | [ .[] | tostring ] | @csv'

Output:

"1","2"