How to post JSON data using curl?

To post JSON data using curl, you can use the curl command with the -X POST option to specify the HTTP method and the -H "Content-Type: application/json" option to set the content type to JSON. You can then pass the data you want to post as a JSON string using the -d option.

Here is an example of how to post JSON data using curl:

curl -X POST -H "Content-Type: application/json" -d '{"key1":"value1", "key2":"value2"}' http://example.com/api

This will send a POST request to the http://example.com/api URL with a JSON body containing the data {"key1":"value1", "key2":"value2"}.

You can also pass a file containing the JSON data using the @ symbol followed by the filename. For example:

curl -X POST -H "Content-Type: application/json" -d @data.json http://example.com/api

This will send a POST request to the http://example.com/api URL with the contents of the data.json file as the request body.

Note that you will need to replace http://example.com/api with the actual URL of the API endpoint you want to send the request to.