Select value in array Json using jq
Question
I have one json file.
{
"cars":
[
{ "name":"Ford", "models":[ "Fiesta", "Focus", "Mustang" ] },
{ "name":"BMW", "models":[ "320", "X3", "X5" ] },
{ "name":"Fiat", "models":[ "500", "Panda" ] }
]
}
I need to give one of the models as input and I want the corresponding name of the car will be the output.
Using jq, I wish to achieve. Please help.
3 answers
solution1
0 2018-06-22 23:34:12
With this filter in the file cars.jq:
.cars[]
| select(.models|index($model))
| .name
and your JSON in cars.json, the invocation:
jq --arg model Panda -f cars.jq cars.json
yields:
"Fiat"
Of course there are many other ways in which the model name can be passed in to the jq program.
As a one-liner:
jq --arg model Panda '.cars[] | select(.models|index($model)) | .name' cars.json
solution2
-1 2018-06-22 23:05:24
You can do something like this:
Syntax jq '.keyName<array/single value>'
cat file.json | jq '.cars[]' // retunts array of cars
cat file.json | jq '.cars[].name' // retunts list of names
cat file.json | jq '.cars[].models[]' // retunts array of car models
solution3
-1 2018-06-22 23:57:11
I don't know why you are requesting jq. In plain vanilla Javascript, the solution is very simple. I don't know if this is the most efficient way, but I would recommend a simple, easy to understand plain vanilla solution over anything else. Unless efficiency is an issue and a sufficiently more efficient solution can be found. Here, I've hardcoded the model "Focus" in the function call and this returns the name "Ford".
<html> <head> <script> function getNameOfModel(model) { var nameOfModel = "Unknown"; var jsonData = {"cars": [ { "name":"Ford", "models":[ "Fiesta", "Focus", "Mustang" ] }, { "name":"BMW", "models":[ "320", "X3", "X5" ] }, { "name":"Fiat", "models":[ "500", "Panda" ] } ]}; var jsonArray = jsonData["cars"]; var i = 0; while (i < jsonArray.length) { if (jsonArray[i]["models"].includes(model)) { nameOfModel = jsonArray[i]["name"]; i = jsonArray.length; } i++; } document.getElementById("carName").innerHTML = nameOfModel; } </script> </head> <body> <div><p id="carName"></p></div> <script>getNameOfModel("Focus");</script> </body> </html>
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