bash script to convert string value to json and then return json - bash

Question

I am very new to bash scripting, please can someone point me in the right direction on how to accomplish my task?
I have a curl call which returns a string, which I want to convert to json.
My curl statement -
curl --insecure -X POST 'https://url/api/IPAM/GetIP' --header 'Content-Type: application/json' --header -d '{"key1": "value1"}'
This curl statement returns a string ,for example: 10.100.100.100
I want to fetch this string and return the output in json format:
{"IP":"10.100.100.100"}
I don't want to use jquery or python to do this because this entire script will be run by a wrapper that only understands bash.

Answer 1

You can use jq to process your IP string into a JSON string and package it into a JSON object of your choice.
ip="10.100.100.100"
jq --arg ip "$ip" -cn '{"IP":$ip}'
Result:
{"IP":"10.100.100.100"}
Now if working with the result of your example curl POST request:
rawip_string=$(curl --insecure -X POST 'https://url/api/IPAM/GetIP' --header 'Content-Type: application/json' --header -d '{"key1": "value1"}')
jq --arg ip "$rawip_string" -cn '{"IP":$ip}'

Answer 2

One way to not rely on external tools like jq, you can get the output ip attribute that to a variable and concatenate it.
$ return=$(echo 10.100.100.100)
$ echo "{\"IP\":\"${return}\"}"
{"IP":"10.100.100.100"}

Answer 3

Like this
printf '{"IP":"%s"}' "$(curl --insecure -X POST 'https://url/api/IPAM/GetIP' --header 'Content-Type: application/json' --header -d '{"key1": "value1"}')"