Passing variables (containing spaces) to curl --data field - json

Question

Arguments containing spaces will not properly pass to the curl command.
Quotes are not passed correctly in the --data field.
If I just echo the variable 'curlData' that I use in the curl command I get everything as it should be; ex :
$echo $curlData
'{"name":"jason","description","service"}'
I don't understand why curl dont expend this 'curlData' variable as expected:
curl --data '{"name":"jason","description","service"}'
Here's a sample of my code:
read -p "Name : " repoName
read -p "Description []: " repoDescription
curlData="'"{'"'name'"':'"'$repoName'"','"'descripton'"':'"'$repoDescription'"'}"'"
curl --data $curlData $apiURL
And the error:
curl: (3) [globbing] unmatched close brace/bracket in column 26
Thank your for your help, I feel i'm in Quote-ception right now.

Answer 1

Quote all variable expansions,
To make sure that curlData is a valid JSON value with properly escaped special-characters etc., use jq for producing it.
curlData="$(jq --arg name "$repoName" --arg desc "$repoDescription" -nc '{name:$name,description:$desc}')"
curl --data "$curlData" "$apiURL"

Answer 2

If you have access to any form of package management, I highly recommend jo.
curlData=$(jo name="$repoName" description="$repoDescription")
curl -d "$curlData" "$apiURL"

Answer 3

I had similar issue, which was very difficult to even understand. I used the below construct in a number of curl commands present in my shell script. It always worked like a charm. Until one fine day I had to pass a variable which was string containing spaces (eg. modelName="Abc def").
curl -X 'PUT' \
'http://localhost:43124/api/v1/devices/'$Id'' \
-H 'accept:*/*' \
-H 'Authorization:Bearer '$token'' \
-H 'Content-Type:application/json' \
-d '{
"modelName":"'$modelName'",
"serialNumber":"'$childSN'"
}'
Worked for me after the below change
curl -X 'PUT' \
'http://localhost:43124/api/v1/devices/'$Id'' \
-H 'accept:*/*' \
-H 'Authorization:Bearer '$token'' \
-H 'Content-Type:application/json' \
-d '{
"modelName":'\""$modelName"\"',
"serialNumber":"'$childSN'"
}'
I took help from the accepted answer by #oguz. Pasting this response , just in case anyone is in similar situation