jQuery ajax json mode

ajax_json.js

function ajax_json(type, url, data, success_fn, failure_fn){
  let ajax_options = {
    type: type,
    url: url,
    dataType: 'json',
    contentType: 'application/json; charset=utf-8',
    data: JSON.stringify(data),
    success: function(resp){
      success_fn(resp);
    },
    failure: function(resp) {
      if(failure_fn){
        failure_fn(resp);
      }
      else {
        alert('Something went wrong');
        console.error('<ERROR>', resp);
      }
    },
  };
  $.ajax(ajax_options);
}