JSFiddle - React, Tailwind, and code Playground

JavaScript

function AddToDatabase() {
  this.url = './api/add';
}

AddToDatabase.prototype.postData = function(dataToPost) {
$.ajax({
    type: "POST",
    url: this.url,
    data: dataToPost,
    context: this,
    success: this.onSuccess
  });
};


var AddToDatabase = new AddToDatabase();
data = {data: 'coucou'};
AddToDatabase.postData(data);