Add multiple parent keys to json array

Question

I have a json file, example.json:

...and would like to add multiple parent items with the desired output:

{
  "target": "Systolic",
  "datapoints": [
    [
      "126",
      1522767000
    ],
    [
      "122",
      1522859400
    ],
    [
      "126",
      1523348520
    ]
  ]
}

I'm having trouble, attempting things like:

cat example.json | jq -s '{target:.[]}', which adds the one key but not understanding how to add a value to the target and another key datapoints.

decided also to help you with some of your older queries. This one could be achieved with jtc like this: jtc -T'{"target": "Systolic", "datapoints": {{}}}' -f example.json - it will apply update right into your source example.json, so that you don't have to save/redirect the output (PS. I'm a developer of the jtc tool) — Dmitry
– Dmitry, Commented Sep 27, 2019 at 14:30

RomanPerekhrest · Accepted Answer · 2018-04-11 19:19:49Z

2

With straightforward jq expression:

jq '{target: "Systolic", datapoints: .}' example.json

The output:

{
  "target": "Systolic",
  "datapoints": [
    [
      "126",
      1522767000
    ],
    [
      "122",
      1522859400
    ],
    [
      "126",
      1523348520
    ]
  ]
}

edited Apr 11, 2018 at 19:19

answered Apr 11, 2018 at 17:05

RomanPerekhrest

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1 Comment

TryTryAgain Over a year ago

Fantastic. I had attempted to use the map function, didn't realize it was so literal. Good lesson, thank you.

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