How to filter json data by date range in javascript

        var startDate = new Date("2015-08-04");
        var endDate = new Date("2015-08-12");

        var resultProductData = product_data.filter(function (a) {
            var hitDates = a.ProductHits || {};
            // extract all date strings
            hitDates = Object.keys(hitDates);
            // convert strings to Date objcts
            hitDates = hitDates.map(function(date) { return new Date(date); });
            // filter this dates by startDate and endDate
            var hitDateMatches = hitDates.filter(function(date) { return date >= startDate && date <= endDate });
            // if there is more than 0 results keep it. if 0 then filter it away
            return hitDateMatches.length>0;
        });
        console.log(resultProductData);

fiddle: http://jsfiddle.net/4nz1ahuw/

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UPDATE as Ates Goral suggests in the comments the solution above can be optimized by using Array.protype.some:

        var startDate = new Date("2015-08-04");
        var endDate = new Date("2015-08-12");

        var resultProductData = product_data.filter(function (a) {
            var hitDates = a.ProductHits || {};
            // extract all date strings
            hitDates = Object.keys(hitDates);
            // improvement: use some. this is an improment because .map()
            // and .filter() are walking through all elements.
            // .some() stops this process if one item is found that returns true in the callback function and returns true for the whole expression
            hitDateMatchExists = hitDates.some(function(dateStr) {
                var date = new Date(dateStr);
                return date >= startDate && date <= endDate
            });
            return hitDateMatchExists;
        });
        console.log(resultProductData);

thank you for your good advice :)

I could not get the above solutions to work. I found a slight modification to the approved answer that worked for me here . The code snippet below got the job done.

var startDate = new Date("2015-08-04");
var endDate = new Date("2015-08-12");

var resultProductData = product_data.filter(a => {
  var date = new Date(a.ProductHits);
  return (date >= startDate && date <= endDate);
});
console.log(resultProductData)