jq - How to iterate through keys of different names

The original tag for this question was jq so here is a jq solution:

.[] | keys[]

For example, with the input as shown in the question:

$ jq '.[] | keys[]' input.json

"identifier1"
"identifier2"

To retrieve the key names in the order they appear in the JSON object, use keys_unsorted.

I'd think something along these lines would work well:

jq '. | to_entries | .[].key'

see https://stedolan.github.io/jq/manual/#to_entries,from_entries,with_entries

or if you wanted to get the values from a variable:

JSON_DATA={main:{k1:v1,k2:v2}}
result=$(jq -n "$JSON_DATA" | jq '.main | to_entries | .[].value' --raw-output)
echo $result

##outputs: v1 v2

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