how to add entry to object inside array using jq

Question

Title says it all. So far I get this:

echo '[{"a": "A", "b": "B"}, {"c": "C", "d": "D"}]' | jq '.[] + {x:"X"}'

Which will result to this:

{
  "a": "A",
  "b": "B",
  "x": "X"
}
{
  "c": "C",
  "d": "D",
  "x": "X"
}

but it will not "wrap" the result in array and also does not add comma after each entry.

peak · Accepted Answer · 2021-04-29 15:47:35Z

2

jq '[.[] + {x:"X"}]'

Or you could use map

answered Apr 29, 2021 at 15:47

peak

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6 Comments

Wakan Tanka Over a year ago

Thank you. Can you plase also add map version just for clarity?

Inian Over a year ago

@WakanTanka: You can just do map(.+ {x:"X"})

Wakan Tanka Over a year ago

thank you both. I've found that this also works jq '.[] += {x:"X"}' Can you please briefly explain why my original approach is not working? Because if I use jq '.' then the output is correct JSON but when I use jq '[.]' then the output is same JSON but nested in one more array.

peak Over a year ago

That's a good point about using += here. To understand all this, I'd suggest reading the relevant parts of the online jq manual while using the debug filter so you can see exactly what's going on at each step.

Wakan Tanka Over a year ago

@peak can you please post how can I use debug in those 3 cases? I'm trying to run following but I got errors: jq 'debug [.[] + {x:"X"}]'

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