MacOS regex grep getting value between curly brace - json

Question

I'm trying to get a curl response between {}. I have found and tested a regex command that works files with Sublime or an online tester.
The problem occurs when I try to execute it with grep from MacOS. I have installed the grep from the brew library, but even though the installation occurred 100%, the command doesn't work. Deleting all break lines of file/response (performing debug), the command works! But in my case, the curl response comes with break lines, so I should be able to handle it.
Could someone tell me why it is occurring with MacOS and how I can solve it?
Curl response:
HTTP/2 401
www-authenticate: Digest realm="MMS Public API", domain="", nonce="8878t9jXCP7+", algorithm=MD5, qop="auth", stale=false
content-type: application/JSON
content-length: 106
x-envoy-upstream-service-time: 3
date: Fri, 13 Jan 2023 17:04:03 GMT
server: envoy
HTTP/2 400
date: Fri, 13 Jan 2023 17:04:04 GMT
strict-transport-security: max-age=31536000; include subdomains;
referrer-policy: strict-origin-when-cross-origin
x-permitted-cross-domain-policies: none
x-content-type-options: nosniff
content-type: application/json
x-frame-options: DENY
content-length: 200
x-envoy-upstream-service-time: 23
server: envoy
{
"detail": "Cluster asdasdasd cannot be created in a paused state.",
"error": 400,
"errorCode": "CANNOT_CREATE_PAUSED_CLUSTER",
"parameters" : [ "asdasdasd" ],
"reason": "Bad Request"
}
I want to get only the following lines:
{
"detail": "Cluster asdasdasd cannot be created in a paused state.",
"error": 400,
"errorCode": "CANNOT_CREATE_PAUSED_CLUSTER",
"parameters" : [ "asdasdasd" ],
"reason": "Bad Request"
}
My regexs:
{([\S\s]+)}
{[^{}]*}
Sublime response:
regextester.com result:

Answer 1

Better use jq.
Your input are plain JSON.
Example to retrieve errorCode:
curl ...... | jq '.errorCode'
jq is like sed for JSON data - you can use it to slice and filter and map and transform structured data with the same ease that sed, awk, grep and friends let you play with text.
Or gron
curl ...... | gron | awk -F' = ' '/^json.errorCode /{print $2}'
To install it:
go install github.com/tomnomnom/gron#latest

Answer 2

I have converted the curl command to python code. It is easier to handle with the response.
import requests
from requests.auth import HTTPDigestAuth
headers = {
'Content-Type': 'application/json',
}
params = {
'pretty': 'true',
}
json_data = {
'autoScaling': {
'diskGBEnabled': True,
},
'backupEnabled': False,
'paused': True,
'name': 'sdasdasd',
'providerSettings': {
'providerName': 'AWS',
'instanceSizeName': 'M10',
'regionName': 'US_EAST_2',
},
}
response = requests.post(
'https://cloud.mongodb.com/api/atlas/v1.0/groups/999999999999/clusters',
params=params,
headers=headers,
json=json_data,
auth=HTTPDigestAuth('user', 'password'),
)
print(response.content)