How to fix duplicated output of jq flattening JSON array

Question

I am trying to flatten a JSON file by using jq command. But the output got duplicated.

Please see my jqplay here: https://jqplay.org/s/gwvMIH_fed

My input JSON:<

Answer 1

Each .[] is like a "for" loop, so the multiplicative behavior you observe is essentially the result of having nested for loops. It would seem that what you want is closer to:

.value[] as $v
| $v.timeseries[].data[] as $d
| {"apiId": $v.id,
  "metrics": $v.name.value,
  "timestamp": $d.timeStamp,
  "value": $d.average }

With your JSON as input, this produces two JSON objects, though the second of these differs very slightly from what you give as the expected output.