Using jq to fetch key value from json output

Question

I have a file that looks as below:

{
  "repositories": [
   {
    "id": "156c48fc-f208-43e8-a631-4d12deb89fa4",
    "namespace": "rhel12",
    "namespaceType": "organization",
    "name": "rhel6.6",
    "shortDescription": "",
    "visibility": "public"
   },
   {
    "id": "f359b5d2-cb3a-4bb3-8aff-d879d51f1a04",
    "namespace": "rhel12",
    "namespaceType": "organization",
    "name": "rhel7",
    "shortDescription": "",
    "visibility": "public"
   }
  ]
 }

I want to get only name values with each of them in a new line so that I can use while read -r line. I need only

rhel6.6 
rhel7

I am using jq as follows which doesn't seem to work:

jq -r '.[].name'

Please suggest correct use of jq here

score 98 · Accepted Answer · edited Dec 05 '22 at 03:49

98

You need to combine filters by means of | operator:

$ jq -r '.[] | .[] | .name' test.json 
rhel6.6
rhel7

The first .[] fetches repositories array. The next .[] fetches all the items of the repositories array. Finally, .name extracts properties from the array items(objects).

Note, the first .[] works on object because it is a documented feature:

.[]
    If you use the .[index] syntax, but omit the index entirely, it
    will return all of the elements of an array...

    You can also use this on an object, and it will return all the
    values of the object.

edited Dec 05 '22 at 03:49

Benjamin Loison

3,782
4
16
33

answered Sep 30 '16 at 19:28

Ruslan Osmanov

20,486
7
46
60

1

thanks for your response. Can you please how can i get output in format `rhel12/rhel6.6` In other words, I need o/p in format `namespace/name` – meallhour Sep 30 '16 at 19:56
2

@meallhour, `jq -r '.[] | .[] | [.namespace, .name] | join("/")' test.json` – Ruslan Osmanov Sep 30 '16 at 20:10

score 36 · Answer 2 · answered Sep 30 '16 at 19:28

36

You want to look at the repositories array instead of treating the input as an array:

$ jq -r '.repositories[].name' file
rhel6.6
rhel7

answered Sep 30 '16 at 19:28

that other guy

116,971
11
170
194

score 16 · Answer 3 · edited Jun 20 '20 at 09:12

Here is another solution. Assuming the requirements

I want to get only name values with each of them in a new line so that I can use while read -r line.

Can you please how can i get output in format rhel12/rhel6.6 In other words, I need o/p in format namespace/name

if the data is in data.json then the command

jq -M -r '.repositories[] | "\(.namespace)/\(.name)"' data.json

should produce

rhel12/rhel6.6
rhel12/rhel7

Using jq to fetch key value from json output

3 Answers3

Linked