How to get data from multidimensional array?

Question

JavaScript

For example, here is an array: https://pastebin.com/aN6NNWj1

How to get and output: steamid

$.getJSON('http://whateverorigin.org/get?url=' + 
    encodeURIComponent('http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=1CD46A47F34C832CAC9A45FB0759CFF5C2C&steamids=7656119793360435530') + '&callback=?',
    function (data) {
        console.log("> ", data);
        for (var i in data.response.players) {
         alert(data.response.players[i].steamid);
        };
        		  
//$('.itd .sp').text(data.contents.Response.Players[0].steamid);
//If the expected response is text/plain
//$('.itd .sp').html('<img id="thePoster" src=' + 'http://cdn.akamai.steamstatic.com/' + data.response.avatarfull + ' />');
        //If the expected response is JSON
        //var response = $.parseJSON(data.contents);
});

Writes an error Cannot read property 'players' of undefined