How can I retrieve data in JSON format from the Gemini 1.5 API using curl?
The code below works correctly:

curl -H 'Content-Type: application/json'      -H "x-goog-api-key: ${API_KEY}"      -d '{"contents":[
            {"role": "user",
              "parts":[{"text": "Give me five subcategories of jazz?"}]}]}'      "https://generativelanguage.googleapis.com/v1/models/gemini-pro:generateContent"

But when I try to add:

,"generation_config": {"response_mime_type": "application/json"}}

Giving:

curl -H 'Content-Type: application/json' -H "x-goog-api-key: ${API_KEY}" -d '{"contents":[
            {"role": "user",
              "parts":[{"text": "Give me five subcategories of jazz?"}]},"generation_config": {"response_mime_type": "application/json"}]'      "https://generativelanguage.googleapis.com/v1/models/gemini-1.5-flash:generateContent"

I receive this error response:

{
  "error": {
    "code": 400,
    "message": "Invalid JSON payload received. Expected , or ] after array value.n,"generation_config": {"response_mime_tyn                    ^",
    "status": "INVALID_ARGUMENT"
  }
}

I’ve tried with several different models (e.g. gemini-1.5-pro-latest) always with the same result.