Unable to get all the keys of map using Object.keys(map)

I have a map(dicts[locale]). I need to fetch all the keys of that map.

I m using below code in my javascript file..

var allKeys=Object.keys(dicts[locale]);

 console.log("all keys:"+allKeys);

But it is displaying only 23 elements Array[23].

Why i m not able to get all the keys.Why its giving only 23 elements.

Please suggest how can i get all the keys.