Javascript - convert number to month name

var months = [ "January", "February", "March", "April", "May", "June", 
           "July", "August", "September", "October", "November", "December" ];

var selectedMonthName = months[value['month']];

look at the links

stack 1

Intl.DateTimeFormat('en', { month: 'long' }).format(new Date('1')); // January

Can be achieved using Internationalization API

This can be easily done using moment.js.

var months = [];
months.push(moment().month(0).format("MMMM"));
console.log(months);

<script src="https://momentjs.com/downloads/moment.min.js"></script>