I have the following JSON:
[
{
"name": "InstanceA",
"tags": [
{
"key": "environment",
"value": "production"
},
{
"key": "group",
"value": "group1"
}
]
},
{
"name": "InstanceB",
"tags": [
{
"key": "group",
"value": "group2"
},
{
"key": "environment",
"value": "staging"
}
]
}
]
I'm trying to get a flat output of value based on the condition key == 'environment'. I already tried select(boolean_expression), but I cannot get the desired output, like:
"InstanceA, production"
"InstanceB, staging"
Does jq support this kind of output? If so, how to do it?
Yes.
For example:
$ jq '.[] | "\(.name), \(.tags | from_entries | .environment)"' input.json
Output:
"InstanceA, production"
"InstanceB, staging"
jq '.[] | .name + ", " + (.tags[] | select(.key == "environment").value)' f.json
Here is a solution using join
.[]
| [.name, (.tags[] | if .key == "environment" then .value else empty end)]
| join(", ")
Related
I have the following JSON:
{
"ids": {
"sda": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi2"
],
"sdb": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0"
],
"sdb1": [
"lvm-pv-uuid-lvld3A-oA4k-hC19-DXzv-D0Fq-xyME-BwgJid",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-part1"
],
"sdc": [
"lvm-pv-uuid-pWes2W-dgYF-l8hG-La48-9ozH-hPdU-MOkOtf",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi1"
]
}
}
What I want to achieve is to search for .*scsi0$ in the values of the inner array and get sdb as the result.
Using JSON jq endswith to filter results:
.ids | to_entries[] | select(.value[] | endswith("scsi0")) | .key
Results in:
"sdb"
Try it here: https://jqplay.org/s/DAhKosXXgiA
First get .ids:
{
"sda": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi2"
],
"sdb": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0"
],
"sdb1": [
"lvm-pv-uuid-lvld3A-oA4k-hC19-DXzv-D0Fq-xyME-BwgJid",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-part1"
],
"sdc": [
"lvm-pv-uuid-pWes2W-dgYF-l8hG-La48-9ozH-hPdU-MOkOtf",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi1"
]
}
...then pipe the results to the to_entries function to convert that to an array of {key, value} objects, .ids | to_entries:
[
{
"key": "sda",
"value": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi2"
]
},
{
"key": "sdb",
"value": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0"
]
},
{
"key": "sdb1",
"value": [
"lvm-pv-uuid-lvld3A-oA4k-hC19-DXzv-D0Fq-xyME-BwgJid",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-part1"
]
},
{
"key": "sdc",
"value": [
"lvm-pv-uuid-pWes2W-dgYF-l8hG-La48-9ozH-hPdU-MOkOtf",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi1"
]
}
]
...next stream the list of objects, .ids | to_entries[]:
{
"key": "sda",
"value": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi2"
]
}
{
"key": "sdb",
"value": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0"
]
}
{
"key": "sdb1",
"value": [
"lvm-pv-uuid-lvld3A-oA4k-hC19-DXzv-D0Fq-xyME-BwgJid",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-part1"
]
}
{
"key": "sdc",
"value": [
"lvm-pv-uuid-pWes2W-dgYF-l8hG-La48-9ozH-hPdU-MOkOtf",
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi1"
]
}
...and select from a stream of values, .ids | to_entries[] | select(.value[]) where value endswith "scsi0", select(.value[] | endswith("scsi0")) :
{
"key": "sdb",
"value": [
"scsi-0QEMU_QEMU_HARDDISK_drive-scsi0"
]
}
...finally, get the key value, .ids | to_entries[] | select(.value[] | endswith("scsi0")) | .key:
"sdb"
Command line:
jq '.ids | to_entries[] | select(.value[] | endswith("scsi0")) | .key'
Try it here: https://jqplay.org/s/DAhKosXXgiA
.ids | to_entries[] | select(.value[] | test(".*scsi0$")) | .key
Will print the key if any value in the array matches your regex.
If none match, there will be no output.
to_entries is uses to easy capture the key of the objects.
select to filter the values
.value[] | test(".*scsi0$") checks each value to the regex
.key and we show the key of the result
Try it online
I have a json output
{
"7": [
{
"devices": [
"/dev/sde"
],
"name": "osd-block-dcc9b386-529c-451e-9d84-8ccc4091102b",
"tags": {
"ceph.crush_device_class": "None",
"ceph.db_device": "/dev/nvme0n1p5",
"ceph.wal_device": "/dev/nvme0n1p6",
},
"type": "block",
"vg_name": "ceph-c4de9e90-853e-4569-b04f-8677ef9a8c7a"
},
{
"path": "/dev/nvme0n1p5",
"tags": {
"PARTUUID": "69712eb4-be52-4618-ba46-e317d6d3d76e"
},
"type": "db"
}
],
"41": [
{
"devices": [
"/dev/nvme1n1p13"
],
"name": "osd-block-97bce07f-ae98-4fdb-83a9-9fa2f35cee60",
"tags": {
"ceph.crush_device_class": "None",
},
"type": "block",
"vg_name": "ceph-c1d48671-2a33-4615-95e3-cc1b18783f0c"
}
],
"9": [
{
"devices": [
"/dev/sdf"
],
"name": "osd-block-35323eb8-17c1-460d-8cc5-565f549e6991",
"tags": {
"ceph.crush_device_class": "None",
"ceph.db_device": "/dev/nvme0n1p7",
"ceph.wal_device": "/dev/nvme0n1p8",
},
"type": "block",
"vg_name": "ceph-9488e8b8-ec18-4860-93d3-6a1ad91c698c"
},
{
"path": "/dev/nvme0n1p7",
"tags": {
"PARTUUID": "ef0e9588-2a20-4c2c-8b62-d73945e01322"
},
"type": "db"
}
]
}
Required output:
osd.7 /dev/sde /dev/nvme0n1p5 /dev/nvme0n1p6
osd.41 /dev/nvme1n1p13 n/a n/a
osd.9 /dev/sdf /dev/nvme0n1p7 /dev/nvme0n1p7
Problems:
When I try parsing using jq .[][].devices, I get null values:
$ cat json | jq .[][].devices
[
"/dev/sde"
]
null
[
"/dev/nvme1n1p13"
]
null
[
"/dev/sdf"
]
null
I can solve it via jq .[][].devices[]?.
However, this trick doesn't help me when I do want to see where there's no value (to print n/a instead):
$ cat json | jq '.[][].tags | ."ceph.db_device"'
"/dev/nvme0n1p5"
null
"/dev/nvme0n1p3"
null
null
"/dev/nvme0n1p7"
null
And finally, I try to create a table:
$ cat json | jq -r '["osd."+keys[]], [.[][].devices[]?], [.[][].tags."ceph.db_device" // ""] | #csv' | column -t -s,
"osd.7" "osd.41" "osd.9"
"/dev/sde" "/dev/nvme0n1p13" "/dev/sdf"
"/dev/nvme0n1p5" "/dev/nvme0n1p7"
So the obvious problem is that the 3rd row doesn't match the correct values.
And the final problem is how do I transpose it from columns to rows, as detailed in the required output?
Would this do what you want?
jq --raw-output '
to_entries[] | [
"osd." + .key,
( .value[0]
| .devices[],
( .tags
| ."ceph.db_device" // "n/a",
."ceph.wal_device" // "n/a"
)
)
]
| #tsv
'
osd.7 /dev/sde /dev/nvme0n1p5 /dev/nvme0n1p6
osd.41 /dev/nvme1n1p13 n/a n/a
osd.9 /dev/sdf /dev/nvme0n1p7 /dev/nvme0n1p8
Demo
I have a JSON file that looks like this:
{
"InstanceId": "i-9KwoRGF6jbhYdZi823aE4qN",
"Tags": [
{
"Key": "blah",
"Value": "server-blah"
},
{
"Key": "environment",
"Value": "ops"
},
{
"Key": "server_role",
"Value": "appserver"
},
{
"Key": "Name",
"Value": "some_name"
},
{
"Key": "product",
"Value": "some_server"
}
]
}
{
...more objects like the above...
}
I need to display the InstanceId where "Key" == "environment" and "Value" == "ops".
I have jq-1.6.
If I say:
cat source.json | jq '
{ InstanceId, Tags } |
(.Tags[] | select( .Key == "environment" ))
'
I get some of what I want, but I cannot figure out how to include InstanceId in the output nor how to incorporate the "and" part of the select.
Here is a simple but efficient approach using any:
select( any(.Tags[]; .Key=="environment" and .Value == "ops") )
| .InstanceId
An alternative approach that avoids .Tags[]:
{"Key": "environment", "Value": "ops"} as $object
| select( .Tags | index($object) )
| .InstanceId
I'm not sure if this is the exact output you're looking for (comment if it isn't), but this will output the InstanceIds of JSON objects that contain a Tag with Key environment and Value ops.
jq 'select( .Tags[] | (.Key == "environment" and .Value == "ops")) | .InstanceId' < source.json
jq strikes again. Trying to get the value of DATABASES_DEFAULT based on the name in a json file that has a whole lot of names and I'm completely lost.
My file looks like the following (output of an aws ecs describe-task-definition) only much more complex; I've stripped this to the most basic example I can where the structure is still intact.
{
"taskDefinition": {
"status": "bar",
"family": "bar2",
"volumes": [],
"taskDefinitionArn": "bar3",
"containerDefinitions": [
{
"dnsSearchDomains": [],
"environment": [
{
"name": "bar4",
"value": "bar5"
},
{
"name": "bar6",
"value": "bar7"
},
{
"name": "DATABASES_DEFAULT",
"value": "foo"
}
],
"name": "baz",
"links": []
},
{
"dnsSearchDomains": [],
"environment": [
{
"name": "bar4",
"value": "bar5"
},
{
"name": "bar6",
"value": "bar7"
},
{
"name": "DATABASES_DEFAULT",
"value": "foo2"
}
],
"name": "boo",
"links": []
}
],
"revision": 1
}
}
I need the value of DATABASES_DEFAULT where the name is baz. Note that there are a lot of keypairs with name, I'm specifically talking about the one outside of environment.
I've been tinkering with this but only got this far before realizing that I don't understand how to access nested values.
jq '.[] | select(.name==DATABASES_DEFAULT) | .value'
which is returning
jq: error: DATABASES_DEFAULT/0 is not defined at <top-level>, line 1:
.[] | select(.name==DATABASES_DEFAULT) | .value
jq: 1 compile error
Obviously this a) doesn't work, and b) even if it did, it's independant of the name value. My thought was to return all the db defaults and then identify the one with baz, but I don't know if that's the right approach.
I like to think of it as digging down into the structure, so first you open the outer layers:
.taskDefinition.containerDefinitions[]
Now select the one you want:
select(.name =="baz")
Open the inner structure:
.environment[]
Select the desired object:
select(.name == "DATABASES_DEFAULT")
Choose the key you want:
.value
Taken together:
parse.jq
.taskDefinition.containerDefinitions[] |
select(.name =="baz") |
.environment[] |
select(.name == "DATABASES_DEFAULT") |
.value
Run it like this:
<infile jq -f parse.jq
Output:
"foo"
The following seems to work:
.taskDefinition.containerDefinitions[] |
select(
select(
.environment[] | .name == "DATABASES_DEFAULT"
).name == "baz"
)
The output is the object with the name key mapped to "baz".
$ jq '.taskDefinition.containerDefinitions[] | select(select(.environment[]|.name == "DATABASES_DEFAULT").name=="baz")' tmp.json
{
"dnsSearchDomains": [],
"environment": [
{
"name": "bar4",
"value": "bar5"
},
{
"name": "bar6",
"value": "bar7"
},
{
"name": "DATABASES_DEFAULT",
"value": "foo"
}
],
"name": "baz",
"links": []
}
I need to aggregate values by key. Example JSON input is:
$ cat json | jq
[
{
"key": "john",
"value": "ontario"
},
{
"key": "ryan",
"value": "chicago"
},
{
"key": "ryan",
"value": "illinois"
},
{
"key": "john",
"value": "toronto"
},
]
Is it possible and if so how to merge/join/concat values with the same key so that the result is:
[
{
"key": "john",
"value": "toronto ontario"
},
{
"key": "ryan",
"value": "illinois chicago"
},
]
I am targetting JQ specifically because of its ease of use from cfengine.
Group the pairs by key, then combine the values.
group_by(.key) | map({key:.[0].key,value:(map(.value) | join(" "))})
For this type of problem, I prefer to avoid the overhead of sorting, and to guarantee that the ordering of the objects in the input is respected.
Here's one approach that assumes the values associated with "key" and "value" are all strings (as is the case in the example). This assumption makes it easy to avoid an inefficient lookup:
def merge_by_key(separator):
reduce .[] as $o
({}; $o["key"] as $k
| if .[$k] then .[$k] += (separator + $o["value"])
else .[$k] = $o["value"] end);
merge_by_key(" ") | to_entries
Output:
[{"key":"john","value":"ontario toronto"},
{"key":"ryan","value":"chicago illinois"}]
Generic solution
def merge_at_key(separator):
reduce .[] as $o
([];
$o["key"] as $k
| (map(.key) | index($k)) as $i
| if $i then (.[$i] | .value) += (separator + $o["value"])
else . + [$o] end);