Javascript .. greasemonkey ajex post send and received date

Can anyone tell me how to send json code via greasemonkey?

Anyone help me Craet Script?

Here is code how website send data:

Code:

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    function generate_otp(filerfno_var,passport_no_var) {
        $('#error_msg').html('');
        var value1_var=document.getElementsByClassName("app_field")[0].value;
        var value2_var=document.getElementsByClassName("app_field")[1].value;
        if(document.getElementById('generate_otp').checked == true)
            var otp_required_var="generate_otp";
        else if(document.getElementById('have_otp').checked == true)
            var otp_required_var="have_otp";
        else if(document.getElementById('send_alotment_sms').checked == true)
            var otp_required_var="send_alotment_sms";
        var otp_var=document.getElementById("otp").value;
        var captcha_var=document.getElementById("captcha").value;
        //http://localhost:8084/struts_bgd/json/GenerateOtp?filerfno=BGDDV0004116&passport_no=PASS123&value1=TEST&value2=TEST
        $.ajax({
            type: "POST",
            url: "json/GenerateOtp",
            dataType: "json",
            data: {filerfno : filerfno_var,passport_number:passport_no_var,value1:value1_var,value2:value2_var,otp_required:otp_required_var,otp:otp_var,captcha:captcha_var},
            success: function (data) {
                //alert(data['sms_output']);                   
                alert(data);
                $('#generate_otp_msg').text(data);
                refreshCaptcha();
                $('#captcha').val('');
                $('#have_otp').prop('checked', false); 
                $('#generate_otp').prop('checked', false); 
                $('#send_alotment_sms').prop('checked', false); 
            }
        })
        .done(function (data) {
        })
        .fail(function () {
            alert("Some problem occurred");
        })
        .always(function () {
        });
    }

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MOTERATOR's NOTE - I've removed the link you supplied as it doesn't appear to link to anything other than a blank page with a single set of quote marks on it. Might be network issues, not sure. I'm allowing this post though because you have also supplied code