Converting a list of objects to an array

Question

Given I have a list of objects:

{
  "alpha": {
    "bytes": {
      "value": 4789440
    },
    "doc_count": 7723
  },
  "beta": {
    "bytes": {
      "value": 4416862639
      },
    "doc_count": 1296
  }
}

Is there a way using jq to get an array representation of this, such as:

  [
    {
      "key": "alpha",
      "bytes": {
        "value": 4789440
      },
      "doc_count": 7723
    },
    {
      "key": "beta",
      "bytes": {
        "value": 4416862639
      },
      "doc_count": 1296
    }
  ]

Neither of your desired output formats are valid JSON (fields only exist in objects such as {"a":1}, not in arrays (["a":1] is not valid). You can, however, have an array of objects [{"a":1},{"b":2}] if this is what you want. — pmf
– pmf, Commented Jan 19, 2022 at 14:04
@pmf You are totally right, sorry for that... I have updated the question with a correct example result. — sontags
– sontags, Commented Jan 19, 2022 at 14:08

pmf · Accepted Answer · 2022-01-19 14:09:29Z

3

Using to_entries would be one way. By accessing .key and .value, the composition would be:

jq '[to_entries[] | {key} + .value]' input.json

[
  {
    "key": "alpha",
    "bytes": {
      "value": 4789440
    },
    "doc_count": 7723
  },
  {
    "key": "beta",
    "bytes": {
      "value": 4416862639
    },
    "doc_count": 1296
  }
]

Demo

answered Jan 19, 2022 at 14:09

pmf

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Comments

ikegami · Accepted Answer · 2022-01-19 15:38:28Z

1

[ keys_unsorted[] as $key | { $key } + .[$key] ]

Demo on jqplay

or

to_entries | map( { key } + .value )

Demo on jqplay

answered Jan 19, 2022 at 15:38

ikegami

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