Update multiple Json with CURL POST - bash

Question

I would like to update multiple JSON filed in the same curl POST but I am not able to make it work.
I keep getting 400.
I tried checking online but was not able to find another way. Maybe there is an easier way of doing this but I am not sure what it is. Thanks for the help
I tried the following
curl -X 'PUT' \
'http://192.168.1.256:123/api/accessories/123456789' \
-H 'accept: */*' \
-H 'Authorization: Bearer $token' \
-H 'Content-Type: application/json' \
-d '{
"characteristicType": "Saturation",
"value": "30"
}
{
"characteristicType": "On",
"value": "1"
}'
curl -X 'PUT' \
'http://192.168.1.256:123/api/accessories/123456789' \
-H 'accept: */*' \
-H 'Authorization: Bearer $token' \
-H 'Content-Type: application/json' \
-d '{
"characteristicType": "Saturation",
"value": "30"
},
{
"characteristicType": "On",
"value": "1"
}'
curl -X 'PUT' \
'http://192.168.1.256:123/api/accessories/123456789' \
-H 'accept: */*' \
-H 'Authorization: Bearer $token' \
-H 'Content-Type: application/json' \
-d '[
{
"characteristicType": "Saturation",
"value": "30"
}
{
"characteristicType": "On",
"value": "1"
}
]'

Answer 1

You may test what comes to the server by using a dummy nc server in localhost with an arbitrary port such as in the example below:
$ nc -l 10000
And change this IP/port in the curl command, so the first example becomes:
curl -X 'PUT' \
'localhost:10000' \
-H 'accept: */*' \
-H 'Authorization: Bearer $token' \
-H 'Content-Type: application/json' \
-d '{
"characteristicType": "Saturation",
"value": "30"
}
{
"characteristicType": "On",
"value": "1"
}'
This is what the server will received:
$ nc -l 10000
PUT / HTTP/1.1
Host: localhost:10000
User-Agent: curl/7.68.0
accept: */*
Authorization: Bearer $token
Content-Type: application/json
Content-Length: 106
{
"characteristicType": "Saturation",
"value": "30"
}
{
"characteristicType": "On",
"value": "1"
}
How the server will parse this is implementation dependent.
In curl man page, it suggests using an ampersand (&) to add multiple data payloads. This can be done by the command itself by adding -d parameter multiple times:
curl -X 'PUT' \
'localhost:10000' \
-H 'accept: */*' \
-H 'Authorization: Bearer $token' \
-H 'Content-Type: application/json' \
-d '{
"characteristicType": "Saturation",
"value": "30"
}' \
-d '{
"characteristicType": "On",
"value": "1"
}'
Very certainly your server will not like the resulting syntax in the body though considering it's json.
As an additional note, be careful with using bash variables inside quoted strings. If they are single quoted instead of double quoted, they are not expanded. You probably should use -H "Authorization: Bearer $token" instead.