Output specific key value in object for each element in array with jq for JSON - iteration

Question

I have an array:
[
{
"AssetId": 14462955,
"Name": "Cultural Item"
},
{
"AssetId": 114385498,
"Name": "Redspybot"
},
{
"AssetId": 29715011,
"Name": "American Cowboy"
},
{
"AssetId": 98253651,
"Name": "Mahem"
}
]
I would like to loop through each object in this array, and pick out the value of each key called AssetId and output it.
How would I do this using jq for the command line?

Answer 1

The command-line tool jq writes to STDOUT and/or STDERR. If you want to write the .AssetId information to STDOUT, then one possibility would be as follows:
jq -r ".[] | .AssetId" input.json
Output:
14462955
114385498
29715011
98253651
A more robust incantation would be: .[] | .AssetId? but your choice will depend on what you want if there is no key named "AssetId".

Answer 2

You can also do it via this command.
jq ".[].AssetId" input.json
if array like be that which is in my case
{
"resultCode":0,
"resultMsg":"SUCCESS",
"uniqueRefNo":"111222333",
"list":[
{
"cardType":"CREDIT CARD",
"isBusinessCard":"N",
"memberName":"Bank A",
"memberNo":10,
"prefixNo":404591
},
{
"cardType":"DEBIT CARD",
"isBusinessCard":"N",
"memberName":"Bank A",
"memberNo":10,
"prefixNo":407814
},
{
"cardType":"CREDIT CARD",
"isBusinessCard":"N",
"memberName":"Bank A",
"memberNo":10,
"prefixNo":413226
}
]
}
you can get the prefixNo with below jq command.
jq ".list[].prefixNo" input.json
For more specific case on array iterating on jq you can check this blogpost

Answer 3

you have a couple of choices to do the loop itself. you can apply peak's awesome answer and wrap a shell loop around it. replace echo with the script you want to run.
via xargs
$ jq -r ".[] | .AssetId" input.json | xargs -n1 echo # this would print
14462955
114385498
29715011
98253651
via raw loop
$ for i in $(jq -r ".[] | .AssetId" input.json)
do
echo $i
done
14462955
114385498
29715011
98253651

Answer 4

An alternative using map:
jq "map ( .AssetId ) | .[]"

Answer 5

For your case jq -r '.[].AssetId' should work
You can also use online JQ Parser : https://jqplay.org/
If you want to loop through the each value then can use below :
for i in $(echo $api_response | jq -r ".[].AssetId")
do
echo echo $i
done