jq - recursive search for keys containing "string" stripping empty results

jq-filters.sh

# recursive search for keys containing "string" stripping empty results
jq '.. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {})'

# same, but output propper array
jq '[ .. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {}) ]'
# or
jq 'map( .. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {}) )'

# transform input from {type: a, amount: 1} to {a: 1} and sum all values by type
jq '[ .[] | {(.type): .amount} ] | map(to_entries) | add | group_by(.key) | map({key: .[0].key, value: map(.value) | add}) | from_entries'

This is a great start! JQ is pretty powerful but arcane. In my case, this produces a series of objects that are not valid json:

{
  "ImageId": "ami-fce3c696"
}
{
  "ImageId": "ami-0d72bbaa068279155"
}

I know you can get it to fix this somewhere with the correct map

@chb0github

To have a proper array as result output surround everything with [ and ], example:
jq '[ .. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {}) ]'

Wow! It's so amazing, thx guys!
But how use new array correctly?
In this example:

{
  "ImageId": "ami-fce3c696"
}
{
  "ImageId": "ami-0d72bbaa068279155"
}

How I can get every ImageId value? Or get plain text like that for use that in bash-scripting?

ami-fce3c696
ami-0d72bbaa068279155

I need use another jq in pipe or we have another way?

@ksemele to get raw text use -r modifier. And to get a value just filter them by their key name, example:

❯ echo '{
  "ImageId": "ami-fce3c696"
}
{
  "ImageId": "ami-0d72bbaa068279155"
}' | jq '.ImageId' -r
ami-fce3c696
ami-0d72bbaa068279155

thanks! This is super useful. When I only care about one key this lets me avoid having to figure out the exact complicated structure of the big object being returned. Cheers!