Ajax CSV undefined array values

Question

For a script I am working I keep getting an array filled with 'undefined' instead of the actual values, I have a CSV file which im reading with $.ajax, I am trying to split the entire CSV into arrays based on the header row.
The code I have now:

$.ajax({
    type: "GET",
    url: "airport.txt",
    dataType: "text",
    success: function(data) {
        lines = processData(data);
        function processData(allText) {
            var allTextLines = allText.split(/\r\n|\n/);
            var headers = allTextLines[0].split(',');
            for (var i=1; i<allTextLines.length; i++) {
                var data = allTextLines[i].split(',');
                if (data.length == headers.length) {
                    var tarr = [];
                    for (var j=0; j<headers.length; j++) {
                        tarr.push(headers[j]+":"+data[j]);
                    }
                    lines.push(tarr);
                }
            }
            lines.map(function(d){
                country.push(d.headers);
            });
            console.log(country);
        }
    }
});

I think the issue lies within the country.push(d.headers); I've tried several other options for the d.headers such as d.lines d.headers[0] d.country and d.data.

What I want is for country to be filled with headers[0] which is the column labeled 'Country Code', but as soon as I change d.headers into d.headers[0] I get Uncaught TypeError: Cannot read property '0' of undefined
What is going wrong here and how can I best approach filtering the CSV file by column?

Edit:
With help of the plugin in the comments I have managed to make it work. Should anyone else run into this, here is the code snippet I've used to make it work for me, it could probably be better but I'm not really advanced in JavaScript.

$(document).ready(function(){
  //Read CSV
  $.ajax({
    type: "GET",
    url: "airport.txt",
    dataType: "text"
  })
  .done(function(data){
    //process CSV Data
    processCsv(data);
  })
  .fail(function(){
    alert("Error: Failed to load data");
  });
});

function processCsv(data){
  //Read CSV Data into multidimensional Array
  var array = $.csv.toArrays(data);
  //Put headers in own array
  var headers = array.splice(0,1);
  //Make each header its own value
  var headerString = headers.toString();
  headers = headerString.split(',');
  //separate all array values
  var arrayString = array.toString();
  array = arrayString.split(',');

  return { header:headers, values:array};
}