In jq, can you get objects back in a list, so you can index them?

Question

So, say I have this JSON...

[
  {
    "a": "1",
    "blah": "true"
  },
  {
    "b": "2",
    "blah": "false"
  },
  {
    "c": "3",
    "blah": "true"
  }
]

...and then use jq to select certain entries...

jq '.[] | select(.blah=="true)'

I get this...

{
  "a": "1",
  "blah": "true"
}
{
  "c": "3",
  "blah": "true"
}

But I want it to look like...

[
  {
    "a": "1",
    "blah": "true"
  }
  {
    "c": "3",
    "blah": "true"
  }
]

...this, so that I can use indexing to get certain of these entries. How do I do that?

Does this answer your question? [How to filter array of objects by element property values using jq?](https://stackoverflow.com/questions/38121740/how-to-filter-array-of-objects-by-element-property-values-using-jq) — knittl, Oct 07 '22 at 21:53

score 3 · Accepted Answer · answered Oct 07 '22 at 19:58

3

Simply indicate you want the result in a list by wrapping the expression with [];

> cat test.json | jq '[.[] | select(.blah=="true")]'

[
  {
    "a": "1",
    "blah": "true"
  },
  {
    "c": "3",
    "blah": "true"
  }
]

answered Oct 07 '22 at 19:58

Joachim Isaksson

score 2 · Answer 2 · answered Oct 07 '22 at 20:09

2

Using map to iterate over the array

jq 'map(select(.blah == "true"))'

answered Oct 07 '22 at 20:09

glenn jackman

score 0 · Answer 3 · answered Apr 02 '23 at 05:57

0

Using param -s:

jq  '.[]|select(.blah=="true")' | jq -s '.'

answered Apr 02 '23 at 05:57

3 Answers3