Add new element to existing JSON array with jq

Question

I want to append an element to an array in a JSON file using the jq``add command, but it\'s not working.

report-2017-01-07.json file:

Answer 1

Summary: ". +" is your saviour

Details:

For adding an entry to a list: You can append [list1] + [list2] (and not [list] + data)

$ echo '[ "data1" ]' | jq '. + [ "data2" ]'
[
  "data1",
  "data2"
]

$ echo '[ {"key1": "value1"} ]' | jq '. + [{"key2": "value2"}]'
[
  {
    "key1": "value1"
  },
  {
    "key2": "value2"
  }
]

For adding a key/value to a dictionary:

$ echo '{"key1": "value1"}' | jq '. + {"key2": "value2"}'
{
  "key1": "value1",
  "key2": "value2"
}

References:

https://gist.github.com/joar/776b7d176196592ed5d8