如何使用JQ从json对象打印keyS

Question

Sample input

{
 “event_timestamp”: “2016-03-16 13:19:53 UTC”,
 “query”: “Plagiarism”,
 “search_session_id”: “3605862756e95d26ac180",
 “version”: “0.0.2",
 “other”: “{\“client_timestamp\“:1458134393.932,\"ios_page_index\":3}“,
 “action”: “HIT_BOUNCE”
}

{
 “event_timestamp”: “2016-03-16 13:19:53 UTC”,
 “query”: “Plagiarism”,
 “search_session_id”: “3605862756e95d26ac180",
 “version”: “0.0.2",
 “other”:“{\“client_timestamp\“:1458134393.932,\"ios_page_index\":3,\"ios_index_path_row\":1}“,
 “action”: “HIT_BOUNCE”
}

I'd like to output the unique key name in "other" field

"client_timestamp,

ios_page_index,

ios_index_path_row "

Tried the following command but doesn't work so far

cat sampleexample.json | jq '.other|keys' | sort | uniq > other.json

Thanks in advance

Answer 1

1. The sample input is not JSON, which does not allow fancy quotes to be used as string delimiters. The following assumes the input has been corrected.

2. The value of .other is a JSON string; you can use fromjson to change the string to a JSON object.

3. sort|unique is redundant, as unique first sorts its input.

Putting it all together:

$ jq  '.other | fromjson | keys_unsorted | unique' input.json
[
  "client_timestamp",
  "ios_page_index"
]
[
  "client_timestamp",
  "ios_index_path_row",
  "ios_page_index"
]

(Using keys_unsorted saves one sort operation.)