The $.getJSON() method does an HTTP GET and not POST. You need to use $.post()
$.post(url, dataToBeSent, function(data, textStatus) {
//data contains the JSON object
//textStatus contains the status: success, error, etc
}, "json");
In that call, dataToBeSent
could be anything you want, although if are sending the contents of a an html form, you can use the serialize method to create the data for the POST from your form.
var dataToBeSent = $("form").serialize();
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