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

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.

Léa Gris · Accepted Answer · 2020-09-23 10:13:05Z

2

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}'

answered Sep 23, 2020 at 10:13

Léa Gris

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Comments

lucasgrvarela · Accepted Answer · 2020-09-23 10:23:57Z

1

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"}

answered Sep 23, 2020 at 10:23

lucasgrvarela

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2 Comments

Léa Gris Over a year ago

printf '{"IP":"%s"}' "$return" is arguably cleaner and easier to read/debug. Although it only work if $return contains no control character or double-quote that would need escaping to make it a proper JSON string.

Ivan Over a year ago

Oops didn't see this comment)

Ivan · Accepted Answer · 2020-09-23 11:16:54Z

1

Like this

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

edited Sep 23, 2020 at 11:16

answered Sep 23, 2020 at 10:34

Ivan

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