how to get data from post callback in js code example

Example 1: jquery ajax post example

var formData = {name:"John", surname:"Doe", age:"31"}; //Array 

$.ajax({
    url : "https://example.com/rest/getData", // Url of backend (can be python, php, etc..)
    type: "POST", // data type (can be get, post, put, delete)
    data : formData, // data in json format
  	async : false, // enable or disable async (optional, but suggested as false if you need to populate data afterwards)
    success: function(response, textStatus, jqXHR) {
    	console.log(response);
    },
    error: function (jqXHR, textStatus, errorThrown) {
		console.log(jqXHR);
      	console.log(textStatus);
      	console.log(errorThrown);
    }
});

Example 2: how to send data using ajax

$.ajax({
	url: "/something", // the url we want to send and get data from
    type: "GET", // type of the data we send (POST/GET)
    data: {p1: "This is our data"}, // the data we want to send
    success: function(data){ // when successfully sent data and returned
    	// do something with the returned data
   		console.log(data);
    }
}).done(function(){
	// this part will run when we send and return successfully
    console.log("Success.");
}).fail(function(){
    // this part will run when an error occurres
    console.log("An error has occurred.");
}).always(function(){
    // this part will always run no matter what
  	console.log("Complete.");
});