source: binary-improvements2/MapRendering/Web/API/GetPlayersOnline.cs@ 384

using System.Collections.Generic;
using AllocsFixes.JSON;
using AllocsFixes.PersistentData;
using HttpListenerRequest = SpaceWizards.HttpListener.HttpListenerRequest;
using HttpListenerResponse = SpaceWizards.HttpListener.HttpListenerResponse;

namespace AllocsFixes.NetConnections.Servers.Web.API {
        public class GetPlayersOnline : WebAPI {
                public override void HandleRequest (HttpListenerRequest _req, HttpListenerResponse _resp, WebConnection _user,
                        int _permissionLevel) {
                        JSONArray players = new JSONArray ();

                        World w = GameManager.Instance.World;
                        foreach (KeyValuePair<int, EntityPlayer> current in w.Players.dict) {
                                ClientInfo ci = ConnectionManager.Instance.Clients.ForEntityId (current.Key);
                                Player player = PersistentContainer.Instance.Players [ci.InternalId, false];

                                JSONObject pos = new JSONObject ();
                                pos.Add ("x", new JSONNumber ((int) current.Value.GetPosition ().x));
                                pos.Add ("y", new JSONNumber ((int) current.Value.GetPosition ().y));
                                pos.Add ("z", new JSONNumber ((int) current.Value.GetPosition ().z));

                                JSONObject p = new JSONObject ();
                                p.Add ("steamid", new JSONString (ci.PlatformId.CombinedString));
                                p.Add ("entityid", new JSONNumber (ci.entityId));
                                p.Add ("ip", new JSONString (ci.ip));
                                p.Add ("name", new JSONString (current.Value.EntityName));
                                p.Add ("online", new JSONBoolean (true));
                                p.Add ("position", pos);

                                p.Add ("level", new JSONNumber (player?.Level ?? -1));
                                p.Add ("health", new JSONNumber (current.Value.Health));
                                p.Add ("stamina", new JSONNumber (current.Value.Stamina));
                                p.Add ("zombiekills", new JSONNumber (current.Value.KilledZombies));
                                p.Add ("playerkills", new JSONNumber (current.Value.KilledPlayers));
                                p.Add ("playerdeaths", new JSONNumber (current.Value.Died));
                                p.Add ("score", new JSONNumber (current.Value.Score));

                                p.Add ("totalplaytime", new JSONNumber (player?.TotalPlayTime ?? -1));
                                p.Add ("lastonline", new JSONString (player != null ? player.LastOnline.ToString ("s") : string.Empty));
                                p.Add ("ping", new JSONNumber (ci.ping));

                                players.Add (p);
                        }

                        WriteJSON (_resp, players);
                }
        }
}