How do you get the key at specifc index in javascript map object?

To fetch the key at index 2, do the following:

// Your map
var items = new Map([['item1','A'], ['item2','B'], ['item3', 'C']]);

// The key at index 2
var key = Array.from(items.keys())[2];                 // Returns 'item3'

// The value of the item at index 2
var val1 = items.get(key);                             // Returns 'C'


// ... or ...
var val2 = items.get(Array.from(items.keys())[2]);     // Returns 'C'

Maps might be ordered, but they are not indexed. The only way to get the nth item is a loop.