how to send variables via ajax json format and how receive this data in python flask

I want to send the contents of the variables via ajax json format, and recover data in python but still I did not managed to fare or sending or retrieving the data.I need help please.

function deconnectmac(){

   var essi = prompt("Please enter essi!!");
   var tab = prompt("Please enter the tab!!");
   var jsonObj = [];
   var obj = {};
   obj["tab"]=tab;
   obj["essi"]=essi;
   jsonObj.push(obj);
   console.log(jsonObj);
   $jsonObj=JSON.stringify(jsonObj);
   if (tab != null) {
     if(essi!= null){
           
           $.ajax({
           type: 'POST',
           url: '/deconnect',
           data:{ data: jsonObj },
           dataType: 'text',
           success: function(text) { 
                   if (text === "success") {
                        alert("success");
                     } else {
                                alert(text);          
                        }              
                       }, 
           error: function(error){
                        
                        console.log(error);
                   }

              });

    }}

}

@APP.route('/deconnect',methods=['POST'])
def deconnect():
    donne_request=json.loads(request)
   
    print donne_request
    return "success"