How to pass dynamic values to JSON with duplicate fields - json

Question

I have a usecase where i have to send REST request in bulk.
JSON File: emp.json
[
{
"field": {
"empID": "sapid",
"location": "India"
}
}
]
My shell script:
func emp_details
{
START=1
END=1000000
CURRENT=1
while [ $END -gt $CURRENT ];
do
CURRENT=$((CURRENT+1))
cat emp.json | jq --arg new "$CURRENT" '.[].field.empID |= $new' > temp.json
cat temp.json
curl <REST Server URL with temp.json as input> "Content-Type: application/json" -d #temp.json
done
}
The above json and script is working. I am able send the request properly.
I am looking for an approach to prepare the json file with mutiple empID before triggering the CURL.
For Example:
[
{
"field": {
"empID": "sapid",
"location": "India",
}
},
{
"field": {
"empID": "sapid",
"location": "India",
}
},
{
"field": {
"empID": "sapid",
"location": "India",
}
}
]
But am not sure how to traverse through each individual empID field and replace its value with dynamic CURRENT values.
Any help is much appreciated

Answer 1

You're looking for the range built-in.
.[] | [.field.empID = range(1;1000000)]
demo at jqplay.org

Answer 2

You don't need bash processing at all for this. You can use the range() function in jq to create the number range from 1 to million and create multiple objects using the reduce() function
jq -n 'reduce range(1; 1000000) as $data (.; . + [{"field": { "empID": $data, "location": "India"}}])'
This creates a million objects inside the array with empID set, starting from 1. Modify the value inside range() to customize the numbers.