pingnature.js

$.ajax({
    url: 'https://scheduler.bookedin.com/api/v1/companies/nurtured-by-nature/dayAvailability?from=2017-01-01&to=2018-01-31',
    dataType: 'jsonp',
    success: function(data) {
        for (var x = 0; x < data.months.length; x++) {
            if (data.months[x].availability.length > 0) {
                alert('opening found');
            }
        }
    },
    error: function() {
        alert('Error');
    }
});