var data = {'August.2018': {Flights: 274834},
'December.2019': {Flights: 222036},
'February.2019': {Flights: 299376},
'January.2019': {Flights: 399559},
'July.2019': {Flights: 187985},
'June.2019': {Flights: 143985},
'March.2019': {Flights: 242277},
'November.2019': {Flights: 194460},
'October.2019': {Flights: 1943880},
'September.2019': {Flights: 122304}};
// object which holds the order value of the month
var monthNames = [
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"
];
// sort the data array
data.sort(function(a, b) {
// sort based on the value in the monthNames object
return monthNames[a[0]] - monthNames[b[0]];
});
document.write('<pre>' + JSON.stringify(data, 0, 3) + '</pre>')
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