I'm trying to improve on a jq reduce, but finding that some of the returned data is nested and the code I'm using breaks on that.
This is where I've got the jq code from: https://github.com/influxdata/telegraf/tree/master/plugins/inputs/powerdns_recursor
Taking tonumber off I get the following clipped output:
[...]
"x-ourtime8-16": "0",
"zone-disallowed-notify": "0",
"response-by-qtype": [
{
"name": "A",
"value": "8958"
},
{
"name": "NS",
"value": "6"
},
[...]
The original code, with tonumber left in:
curl -s -H 'X-API-Key: <key>' http://127.0.0.1:8082/api/v1/servers/localhost/statistics | jq 'reduce .[] as $item ({}; . + { ($item.name): ($item.value|tonumber)})'
The output I'm after:
[...]
"x-ourtime8-16": 0,
"zone-disallowed-notify": 0,
"response-by-qtype.A": 8958,
"response-by-qtype.NS": 6,
[...]
I've spent some time Googling jq and nested input, but I don't want the index numbers this gave me in the names. I'm hoping a small tweak will do the trick.
To transform this input :
{
"x-ourtime8-16": "0",
"zone-disallowed-notify": "0",
"response-by-qtype": [
{
"name": "A",
"value": "8958"
},
{
"name": "NS",
"value": "6"
}
]
}
You can run :
jq ' to_entries |
map(if (.value | type) == "string"
then .value |= tonumber
else .key as $key | .value[] |
.name |= $key+"."+. |
.value |= tonumber
end
) | from_entries
' input.json
to get :
{
"x-ourtime8-16": 0,
"zone-disallowed-notify": 0,
"response-by-qtype.A": 8958,
"response-by-qtype.NS": 6
}
You can convert numeric strings to numbers using:
if type == "string" then . as $in | try tonumber catch $in else . end
As a post-processing step, you could use walk as a wrapper:
walk(if type == "string" then . as $in | try tonumber catch $in else . end)
Related
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
Given the input in this form
[
{
"DIR" : "/foo/bar/a/b/c",
"OUT" : "/foo/bar/x/y/z",
"ARG" : [ "aaa", "bbb", "/foo/bar/a", "BASE=/foo/bar" ]
},
{
"DIR" : "/foo/baz/d/e/f",
"OUT" : "/foo/baz/x/y/z",
"ARG" : [ "ccc", "ddd", "/foo/baz/b", "BASE=/foo/baz" ]
},
{
"foo" : "bar"
}
]
I'm trying to find out how to make jq transform that into this:
[
{
"DIR" : "BASE/a/b/c",
"OUT" : "BASE/x/y/z",
"ARG" : [ "aaa", "bbb", "BASE/a", "BASE=/foo/bar" ]
},
{
"DIR" : "BASE/d/e/f",
"OUT" : "BASE/x/y/z",
"ARG" : [ "ccc", "ddd", "BASE/b", "BASE=/foo/baz" ]
},
{
"foo" : "bar"
}
]
In other words, objects having an "ARG" array, containing a string that starts with "BASE=" should use the string after "BASE=", e.g. "/foo" to substitute other string values that start with "/foo" (except the "BASE=/foo" which should remain unchanged")
I'm not even close to finding a solution myself, and at this point I'm unsure that jq alone will do the job.
With jq:
#!/usr/bin/jq -f
# fix-base.jq
def fix_base:
(.ARG[] | select(startswith("BASE=")) | split("=")[1]) as $base
| .DIR?|="BASE"+ltrimstr($base)
| .OUT?|="BASE"+ltrimstr($base)
| .ARG|=map(if startswith($base) then "BASE"+ltrimstr($base) else . end)
;
map(if .ARG? then fix_base else . end)
You can run it like this:
jq -f fix-base.jq input.json
or make it an executable like this:
chmod +x fix-base.jq
./fix-base.jq input.json
Don't worry, jq alone will do the job:
jq 'def sub_base($base): if (startswith("BASE") | not) then sub($base; "BASE") else . end;
map(if .["ARG"] then ((.ARG[] | select(startswith("BASE=")) | split("=")[1]) as $base
| to_entries
| map(if (.value | type == "string") then .value |= sub_base($base)
else .value |= map(sub_base($base)) end)
| from_entries)
else . end)' input.json
The output:
[
{
"DIR": "BASE/a/b/c",
"OUT": "BASE/x/y/z",
"ARG": [
"aaa",
"bbb",
"BASE/a",
"BASE=/foo/bar"
]
},
{
"DIR": "BASE/d/e/f",
"OUT": "BASE/x/y/z",
"ARG": [
"ccc",
"ddd",
"BASE/b",
"BASE=/foo/baz"
]
},
{
"foo": "bar"
}
]
Some helper functions make the going much easier. The first is generic and worthy perhaps of your standard library:
# Returns the integer index, $i, corresponding to the first element
# at which f is truthy, else null
def indexof(f):
label $out
| foreach .[] as $x (null; .+1;
if ($x|f) then (.-1, break $out) else empty end) // null;
# Change the string $base to BASE using gsub
def munge($base):
if type == "string" and (test("^BASE=")|not) then gsub($base; "BASE")
elif type=="array" then map(munge($base))
elif type=="object" then map_values(munge($base))
else .
end;
And now the easy part:
map(if has("ARG")
then (.ARG|indexof(test("^BASE="))) as $ix
| if $ix
then (.ARG[$ix]|sub("^BASE=";"")) as $base | munge($base)
else . end
else . end )
Some points to note:
You may wish to use sub rather than gsub in munge;
The above solution assumes you want to make the change in all keys, not just "DIR", "OUT", and "ARG"
The above solution allows specifications of BASE that include one or more occurrences of "=".
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);
Using jq I would like to inverse a json object so that the property becomes the value and the value becomes the key.
Source:
{
"123": "Foobar"
"567": "Poit"
}
Goal:
{
"Foobar": "123"
"Poit": "567"
}
How can I achieve that?
In your particular case:
to_entries | map( {(.value) : .key } ) | add
More robustly:
to_entries | map( {(.value|tostring) : .key } ) | add
Or if you prefer:
with_entries( .key as $k | .key = (.value|tostring) | .value = $k )
Caveat: all these are potentially lossy.
If some keys have equal values then probably you would like to get an array of keys as value:
to_entries
| map( {(.value) : {(.key):null} } )
| reduce .[] as $item ({}; . * $item)
| to_entries
| map({key:.key, value:(.value|keys)})
| from_entries
input:
{
"key1": "val0",
"key2": "val1",
"key3": "val1"
}
output:
{
"val0": ["key1"],
"val1": ["key2", "key3"]
}
I would use an approach similar to #peak's answer but without using the add method
First use to_entries to get an output like this:
-> to_entries
Output:
[
{
"key": "123",
"value": "Foobar"
},
{
"key": "567",
"value": "Poit"
}
]
Then use map to swap the keys with values:
-> to_entries | map({key: .value|tostring, value: .key}) ###**tostring** method converts a number to string since keys can't be numbers
Output:
[
{
"key": "Foobar",
"value": "123"
},
{
"key": "Poit",
"value": "567"
}
]
Finally use from_entries to remove the key/value and return back to the original format:
-> to_entries | map({key: .value|tostring, value: .key}) | from_entries
Output:
{
"Foobar": "123",
"Poit": "567"
}
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(", ")