jq combine fields from array of objects in 2 json files into 3rd json file

Question

file1.json

[
  {
    "a": "a",
    "b": "b"
  },
  {
    "a": "a",
    "b": "b"
  }
]

[
  {
    "c": "c"
  },
  {
    "c": "c"
  }
]

[
  {
    "a": "a",
    "b": "b",
    "c": "c"
  },
  {
    "a": "a",
    "b": "b",
    "c": "c"
  }
]

Just an FYI: In this case there will be identical number of objects in both files. — jasonleonhard
– jasonleonhard, Commented Apr 30, 2020 at 0:01

peak · Accepted Answer · 2020-04-30 01:38:57Z

1

For this type of problem, transpose (think zip) can often be used to produce compact solutions. In the present case:

jq -s 'transpose | map(add)' file1.json file2.json

jq's transpose can also be used with arrays that are not of the same length.

answered Apr 30, 2020 at 1:38

peak

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