I have some JSON like this:
{
"x": [
{
"name": "Hello",
"id": "211"
},
{
"name": "Goodbye",
"id": "221"
},
{
"name": "Christmas",
"id": "171"
}
],
"y": "value"
}
Using jq, given a name value (e.g. Christmas) how can I get it's associated id (i.e. 171).
I've got as far as being able to check for presence of the name in one of the array's objects, but I can't work out how to filter it down
jq -r 'select(.x[].name == "Christmas")'
jq approach:
jq -r '.x[] | select(.name == "Christmas").id' file
171
The function select(boolean_expression) produces its input unchanged if boolean_expression returns true for that input, and produces no output otherwise.
It can also been done like:
jq '.x[] | select(.name == "Christmas").id'
Also you can try this at link online jq play
Related
This may just not be possible due to how conceptually streaming/filtering JSON works, but let's suppose I have something like the following JSON:
[
{
"name": "account_1",
"type": "account"
},
{
"name": "account_2",
"type": "account"
},
{
"name": "user_1",
"type": "user"
},
{
"name": "user_2",
"type": "user"
}
]
And now I want to print out only the user objects.
I know I can filter to just the streaming type entities with something like this:
cat file.json | jq --stream 'select(.[0][1] == "type" and .[1] == "user" | .)'
Which would produce:
[
[
2,
"type"
],
"user"
]
[
[
3,
"type"
],
"user"
]
Is there any way I can print out the parent objects of those types instead of the type entities? E.g. I'd like to get out:
[
{
"name": "user_1",
"type": "user"
},
{
"name": "user_2",
"type": "user"
}
]
Without streaming, this is a pretty straightforward exercise. E.g.:
cat file.json | jq '.[] | select(.type=="user")'
In reality the actual input file is around 5GB, so I need to use streaming input, but I can't seem to get the jq syntax right with --stream enabled. E.g.
cat file.json | jq --stream '.[] | select(.type=="user")'
Produces:
jq: error (at <stdin>:3): Cannot index array with string "type"
jq: error (at <stdin>:5): Cannot index array with string "type"
...
(edited to include desired output)
Just truncate the top-level array.
jq -n --stream 'fromstream(1 | truncate_stream(inputs)) | select(.type == "user")'
Online demo
jqplay does not support the --stream option, so the above demo has the output of --stream as the JSON input.
I have a file containing the following structure and unknown number of results:
{
"results": [
[
{
"field": "AccountID",
"value": "5177497"
},
{
"field": "Requests",
"value": "50900"
}
],
[
{
"field": "AccountID",
"value": "pro"
},
{
"field": "Requests",
"value": "251"
}
]
],
"statistics": {
"Matched": 51498,
"Scanned": 8673577,
"ScannedByte": 2.72400814E10
},
"status": "HOLD"
}
{
"results": [
[
{
"field": "AccountID",
"value": "5577497"
},
{
"field": "Requests",
"value": "51900"
}
],
"statistics": {
"Matched": 51498,
"Scanned": 8673577,
"ScannedByte": 2.72400814E10
},
"status": "HOLD"
}
There are multiple such results which are indexed as an array with the results folder. They are not seperated by a comma.
I am trying to just print The "AccountID" sorted by "Requests" in ZSH using jq. I have tried flattening them and using:
jq -r '.results[][0] |.value ' filename
jq -r '.results[][1] |.value ' filename
To get the Account ID and Requests seperately and sorting them. I don't think bash has a dictionary that can be used. The problem lies in the file as the Field and value are not key value pair but are both pairs. Therefore extracting them using the above two lines into seperate arrays and sorting by the second array seems a bit too long. I was wondering if there is a way to combine both the operations.
The other way is to combine it all to a string and sort it in ascending order. Python would probably have the best solution but the code requires to be a zsh or bash script.
Solutions that use sed, jq or any other ZSH supported compilers are welcome. If there is a way to create a dictionary in bash, please do let me know.
The projectd output requirement is just the Account ID vs Request Number.
5577497 has 51900 requests
5177497 has 50900 requests
pro has 251 requests
If you don't mind learning a little jq, it will probably be best to write a small jq program to do what you want.
To get you started, consider the following jq program, which assumes your input is a stream of valid JSON objects with a "results" key similar to your sample:
[inputs | .results[] | map( { (.field) : .value} ) | add]
After making minor changes to your input so that it consists of valid JSON objects, an invocation of jq with the -n option produces an array of AccountID/Requests objects:
[
{
"AccountID": "5177497",
"Requests": "50900"
},
{
"AccountID": "pro",
"Requests": "251"
},
{
"AccountID": "5577497",
"Requests": "51900"
}
]
You could (for example) now use jq's group_by to group these objects by AccountID, and thereby produce the result you want.
jq -S '.results[] | map( { (.field) : .value} ) | add' query-results-aggregate \
| jq -s -c 'group_by(.number_of_requests) | .[]'
This does the trick. Thanks to peak for the guidance.
I have json like below:
% cat example.json
{
"values" : [
{
"title": "B",
"url": "https://B"
},
{
"title": "A",
"url": "https://A"
}
]
}
I want to sort the values based on title. i.e. expected output
{
"title": "A",
"url": "https://A"
}
{
"title": "B",
"url": "https://B"
}
Tried the blow. Does not work:
% jq '.values[] | sort' example.json
jq: error (at example.json:12): object ({"title":"B...) cannot be sorted, as it is not an array
% jq '.values[] | sort_by(.title)' example.json
jq: error (at example.json:12): Cannot index string with string "title"
If you want to preserve the overall structure, you would use the jq filter:
.values |= sort_by(.title)
If you want to extract .values and sort the array, leave out the "=":
.values | sort_by(.title)
To produce the output as shown in the Q:
.values | sort_by(.title)[]
Uniqueness
There are several ways in which "uniqueness" can be defined, and also several ways in which uniqueness can be achieved.
One option would simply be to use unique_by instead of sort_by; another (with different semantics) would be to use (sort_by(.title)|unique) instead of sort_by(.title).
My json file looks like this;
{
"RQBTYFE86MFC3oL": {
"name": "Nightmode",
"lights": [
"1",
"2",
"3",
"4",
"5",
"7",
"8",
"9",
"10",
"11"
],
"owner": "kvovodUUfn2vlby9h9okdDhv8SrTzkBFjk6kPz2v",
"recycle": false,
"locked": false,
"appdata": {
"version": 1,
"data": "QSXCj_r01_d99"
},
"picture": "",
"lastupdated": "2018-08-08T03:21:39",
"version": 2
}
}
I want to get the 'RQBTYFE86MFC3oL' value by doing a query for 'Nightmode'. So far I came up with this;
jq '.[] | select(.name == "Nightmode")'
This will return me the correct part of the Json but the 'RQBTYFE86MFC3oL' part is stripped. How do I get this part as well?
A simple way to determine the key name(s) corresponding to values satisfying a certain condition is to use to_entries, as explained in the jq manual.
Using this approach, the appropriate jq filter would be:
to_entries[] | select(.value.name == "Nightmode") | .key
with the result:
"RQBTYFE86MFC3oL"
If you want to get the key-value pair, you'd use with_entries as follows:
with_entries( select(.value.name == "Nightmode") )
If the input JSON is too large to fit comfortably in memory, then it would make sense to use jq's streaming parser (invoked with the --stream command-line option):
jq --stream '
select(.[1] == "Nightmode" and (first|length) == 2 and first[1] == "name")
| first | first'
This would produce the key name.
The key idea is that the streaming parser produces arrays including pairs of the form: [ARRAYPATH, VALUE] where VALUE is the value at ARRAYPATH.
You want to get the Key Value.
So use the keys command, to return 'RQBTYFE86MFC3oL' as that is the key, the rest is the value of that key.
jq 'keys'
Here is a snippet: https://jqplay.org/s/YvpCb2PH42
Reference: https://stedolan.github.io/jq/manual/
In my JSON document I have a string that I need manipulated and then have the entire document returned with the 'fixed' values.
The input document is:
{
"records" : [
{
"time": "123456789000"
},
{
"time": "123456789000"
}
]
}
I want to find the "time" key and replace the string by dropping off the last 3 chars. The resulting document would be:
{
"records" : [
{
"time": "123456789"
},
{
"time": "123456789"
}
]
}
I've been trying to understand the jq query syntax but I'm not coming right. I'm still struggling to return the whole document when filtering on a specific value. All I have so far is:
.records[] | select(.time | contains("123456789000"))
Here is a solution using |= and string slicing
.records[].time |= .[:-3]
Sample Run (assuming data in data.json)
$ jq -M '.records[].time |= .[:-3]' data.json
{
"records": [
{
"time": "123456789"
},
{
"time": "123456789"
}
]
}
Try it online at jqplay.org
With jq sub() function:
jq '.records[].time |= sub("[0-9]{3}$";"")' file
The output:
{
"records": [
{
"time": "123456789"
},
{
"time": "123456789"
}
]
}
Or even simpler: via dividing the time value by 1000:
jq '.records[].time |= (tonumber / 1000 | tostring)' file
The following works with jq version 1.4 or later:
jq '.records[].time |= .[:-3]' file.json
(The expression .[:-3] is short for .[0:-3]; the negative integer here counts from the right.)
With jq 1.3, the following filter would work in your particular case:
.records[].time |= (tonumber | ./1000 | tostring)