PHP wont receive POST data from AJAX using FormData - php

Question

I am trying to pass some basic data using JavaScript and PHP.
The PHP is not receiving any data.
I have the following JavaScript code:
var formData = new FormData();
formData.append("action", "save-game");
formData.append("title", title);
formData.append("players", players);
formData.append("noTables", noTables);
formData.append("maxPPT", maxPPT);
formData.append("rounds", roundChart);
$.ajax({
url: "/static/apps/games.php",
type: "POST",
data: formData,
processData: false,
contentType: false,
success: function(response){
if (response.success) {
alert("Saved Game Setup");
} else {
alert("Failed to save game setup, "+response.reason);
console.log(response.reason);
}
}
})
And I have stripped the PHP down to the bare minimum but it is still not receiving the data
header("Content-Type: application/json");
$action = $_POST["action"];
echo json_encode(array(
'success' => false,
'reason' => $action,
));
The $action variable in PHP is returning null

Answer 1

try to build data like here
var buildData = function( _action, _title, _players, _noTables, _maxPPT, _rounds){
var data = {};
data.action = _action;
data.title = _title;
data.players = _players;
data.noTables = _noTables;
data.maxPPT = _maxPPT;
data.rounds = _rounds;
return JSON.stringify(data);
}
var _json = buildData("save-game", title, players, noTables, maxPPT, roundChart);