'How to send json data in cURL

I am trying to post rich text as json data to slack channel using post request but cURL treating data as url and requesting it, how to avoid this situation

here is my request looks like

SLACK_DATA='{\"text\": \"Danny Torrence left a 1 star review for your property.\",\"blocks\": [{\"type\": \"section\",\"text\": {\"type\": \"mrkdwn\",\"text\": \"Danny Torrence left the following review for your property:\"}},{\"type\": \"section\",\"block_id\": \"section567\",\"text\": {\"type\": \"mrkdwn\",\"text\": \"<https://example.com|Overlook Hotel> \n :star: \n Doors had too many axe holes, guest in room 237 was far too rowdy, whole place felt stuck in the 1920s.\"},\"accessory\": {\"type\": \"image\",\"image_url\": \"https://is5-ssl.mzstatic.com/image/thumb/Purple3/v4/d3/72/5c/d3725c8f-c642-5d69-1904-aa36e4297885/source/256x256bb.jpg\",\"alt_text\": \"Haunted hotel image\"}},{\"type\": \"section\",\"block_id\": \"section789\",\"fields\": [{\"type\": \"mrkdwn\",\"text\": \"*Average Rating*\n1.0\"}]}]}'


curl -X POST -H 'Content-type: application/json' --data \'$SLACK_DATA\' https://hooks.slack.com/services/XXXXXXXXX/XXXXXXX/XXxXXXXXXXXXXXXX

I am getting the following output which seems it requesting data treating it as a URL

% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100    26    0    15  100    11     71     52 --:--:-- --:--:-- --:--:--   123
invalid_payload  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: \"Danny
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: Torrence
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: left
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: a
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
jsonbashcurlslack-api


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