Parsing json string from events(function) ajax in Full Calendar - json

Question

I have no clue on how to parse events in full calendar
events: function(start, end, timezone, callback) {
$.ajax({
url: 'async/form.php?a=liste_consignes',
datatype:'json',
data: {
// our hypothetical feed requires UNIX timestamps
start: start.unix(),
end: end.unix()
},
success: function(msg) {
//not sur then how to parse
var events = msg.events;
callback(events); //this gives error
},
});
}
PHP (part of)
while($row = $query->fetch_assoc()) {
$cal['id'] = $row['consigne_id'];
$cal['title'] = $row['contenu'];
$cal['start'] = $row['date_consigne'];
array_push($return_arr,$cal);
}
echo json_encode($return_arr);
PHP is returning
[{"id":"5","title":"consigne","start":"2019-03-03"},{"id":"6","title":"test","start":"2019-03-02"},{"id":"7","title":"test 2","start":"2019-03-02"}]
I tried several way from events as json feed but none of them are returning something

Answer 1

PHP is returning an array. It doesn't have an events field. If your callback is meant to consume an array, simply call callback(msg)

Answer 2

Solution was to convert json string from php to object
success: function(msg) {
var events = [];
var data = jQuery.parseJSON(msg);
$.each(data, function(i, item) {
events.push({
title: item.title,
start: item.start, // will be parsed
end: item.end, // will be parsed
});
});
callback(events);
}