combine two jq filters into one

Question

How jq filter combines the filter outputs? Following jq not generates output.json with respective input arg value (\'jack\').

input.json

{
\"key1\"         


        

Answer 1

The filter you are evidently trying to write is:

      if .key1 == "" then . + {"key1" : $input } else . end
      | if .key2 == "" then . + {"key2" : $input } else . end

This can be simplified to:

      if .key1 == "" then .key1 = $input else . end
      | if .key2 == "" then .key2 = $input else . end

You might also like to consider the following approach:

      def update(f): f |= (if . == "" then $input else . end);
      update(.key1) | update(.key2)