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The process for sending JSON data using cURL's POST method can be summarized as follows:

1. Construct the JSON data as a string or object in your programming language.
2. Set the content type header to "application/json" to indicate that the data being sent is in JSON format.
3. Construct a cURL command and specify the following options:
4. The URL to which the data will be sent
5. The POST method (-X POST)
6. The data to be sent, enclosed with single quotes (' ') or double quotes (" ")
7. Execute the cURL command.
8. Check the response from the server to verify that the data was sent successfully.

Here is an example of sending JSON data using cURL's POST method:

curl -X POST \
  https://example.com/api \
  -H 'Content-Type: application/json' \
  -d '{"name": "John","age": 30,"city": "New York"}'

In this example, the JSON data representing a person's name, age, and city is sent to the URL "https://example.com/api".