Curl request with JSON

gistfile1.txt

curlData='
{
  "set": {
    "uuid": "59097720-9676-11e8-bccf-5dc6be09647d",
    "name": "Test Set",
    "cards": [
      {
        "question": "Test question 1",
        "answer": "Test answer 1",
        "isMarkdown": true,
        "attempt": {
          "daysTellQuiz": 0,
          "lastDate": "2018-08-02T17:06:21.567Z",
          "lastStatus": "new"
        },
        "id": "613068f0-9676-11e8-bccf-5dc6be09647d"
      },
      {
        "question": "Another test question",
        "answer": "another answer",
        "isMarkdown": false,
        "attempt": {
          "daysTellQuiz": 0,
          "lastDate": "2018-08-02T17:06:36.040Z",
          "lastStatus": "new"
        },
        "id": "69d0f790-9676-11e8-bccf-5dc6be09647d"
      }
    ]
  }
}'
echo $curlData | curl -0 -v -X POST \
http://localhost:4444/sync \
-H "Authorization: Bearer $jwt" \
-H 'Content-Type: application/json' \
-d @-