JQ- print specific key value pair - json

Question

I have this JSON:
{
"time": "2022-02-28T22:00:55.196Z",
"severity": "INFO",
"params": [
{"key": "state", "value": "pending"},
{"key": "options", "value": "request"},
{"key": "description", "value": "[FILTERED]"}
],
"content_length": "231"
}
I want to print key value pairs of where the key matches to state and options and also the time and its value. I am able to print the time and all key value pairs by using below command, but not sure how to extract specific key value pairs.
jq '"time:\(.time)" ,[.params[] | "key:\(.key)" ,"value:\(.value)"]' test.json
This gives the output:
"time:2022-02-28T22:00:55.196Z"
[
"key:state",
"value:pending",
"key:options",
"value:request",
"key:description",
"value:[FILTERED]"
]
But my desired output is:
"time:2022-02-28T22:00:55.196Z"
"key:state",
"value:pending",
"key:options",
"value:request"

Answer 1

One solution to the stated problem would be:
< test.json jq '
"time:\(.time)",
[.params[] | select(.key|IN("state","options"))
| "key:\(.key)" ,"value:\(.value)"]
' | sed '/^[][]$/d'
However, it would almost certainly be better to modify the requirements slightly so that the output format is less idiosyncratic. This should also make it easier to formulate a cleaner (e.g. only-jq) solution.

Answer 2

You can use #csv (comma separated values).
Filter
"time:\(.time)",
(.params |
[map(select(.key=="state" or .key=="options"))[]
| "key:\(.key)", "value:\(.value)"]
| #csv)
Input
{
"time": "2022-02-28T22:00:55.196Z",
"severity": "INFO",
"params": [
{"key": "state", "value": "pending"},
{"key": "options", "value": "request"},
{"key": "description", "value": "[FILTERED]"}
],
"content_length": "231"
}
Output
time:2022-02-28T22:00:55.196Z
"key:state","value:pending","key:options","value:request"
Demo
https://jqplay.org/s/F_3QP6-EvK