Subresource to retrieve league eligible players and their stats in a league specific context. Users must be authenticated and a member of the league to query against private leagues.
Additionally, a week parameter can be specified which will only retrieve a players stats from the specified week. If no week is specified, their season totals will be returned.
const YahooFantasy = require('yahoo-fantasy');
const yf = new YahooFantasy(
  Y!APPLICATION_KEY,
  Y!APPLICATION_SECRET,
  tokenCallbackFn, // optional
  redirectUri // optional
);
yf.setUserToken(
  Y!OAuthAccessToken
);
// promise based
try {
  const players = await yf.league.players(
    league_key,
    [player_key(s)],
    week // optional
  );
} catch (e) {
  // handle error
}
// callback based
yf.league.players(
  league_key, 
  [player_key(s)],
  week, // optional
  callbackFn
);
{
  "league_key": "388.l.4023",
  "league_id": "4023",
  "name": "Freddy Beach Baseball",
  "url": "https://baseball.fantasysports.yahoo.com/b1/4023",
  "logo_url": "https://ct.yimg.com/cy/8642/28008092841_fff9e0c2d4_192sq.jpg?ct=fantasy",
  "password": "",
  "draft_status": "postdraft",
  "num_teams": 12,
  "edit_key": "2019-09-18",
  "weekly_deadline": "intraday",
  "league_update_timestamp": "1568792177",
  "scoring_type": "head",
  "league_type": "private",
  "renew": "378_2487",
  "renewed": "",
  "iris_group_chat_id": "RWZ3CRIXYRHPXMAVNE4PVZLZNY",
  "short_invitation_url": "https://baseball.fantasysports.yahoo.com/b1/4023/invitation?key=62e534e1574b8306&ikey=37f690ff55b50507",
  "allow_add_to_dl_extra_pos": 1,
  "is_pro_league": "0",
  "is_cash_league": "0",
  "current_week": 24,
  "start_week": "1",
  "start_date": "2019-03-20",
  "end_week": "24",
  "end_date": "2019-09-22",
  "game_code": "mlb",
  "season": "2019",
  "players": [
    {
      "player_key": "388.p.8575",
      "player_id": "8575",
      "name": {
        "full": "Michael Brantley",
        "first": "Michael",
        "last": "Brantley",
        "ascii_first": "Michael",
        "ascii_last": "Brantley"
      },
      "editorial_player_key": "mlb.p.8575",
      "editorial_team_key": "mlb.t.18",
      "editorial_team_full_name": "Houston Astros",
      "editorial_team_abbr": "Hou",
      "uniform_number": "23",
      "display_position": "OF",
      "headshot": {
        "url": "https://s.yimg.com/iu/api/res/1.2/JPIK98NwOTMuoGBZFDN_iw--~C/YXBwaWQ9eXNwb3J0cztjaD0yMzM2O2NyPTE7Y3c9MTc5MDtkeD04NTc7ZHk9MDtmaT11bGNyb3A7aD02MDtxPTEwMDt3PTQ2/https://s.yimg.com/xe/i/us/sp/v/mlb_cutout/players_l/03222019/8575.1.png",
        "size": "small"
      },
      "image_url": "https://s.yimg.com/iu/api/res/1.2/JPIK98NwOTMuoGBZFDN_iw--~C/YXBwaWQ9eXNwb3J0cztjaD0yMzM2O2NyPTE7Y3c9MTc5MDtkeD04NTc7ZHk9MDtmaT11bGNyb3A7aD02MDtxPTEwMDt3PTQ2/https://s.yimg.com/xe/i/us/sp/v/mlb_cutout/players_l/03222019/8575.1.png",
      "is_undroppable": "0",
      "position_type": "B",
      "primary_position": "OF",
      "eligible_positions": [
        "OF",
        "Util"
      ],
      "player_stats": {
        "coverage_type": "season",
        "coverage_value": "2019",
        "stats": [
          {
            "stat_id": "60",
            "value": "175/549"
          },
          {
            "stat_id": "7",
            "value": "86"
          },
          {
            "stat_id": "12",
            "value": "21"
          },
          {
            "stat_id": "13",
            "value": "86"
          },
          {
            "stat_id": "16",
            "value": "3"
          },
          {
            "stat_id": "3",
            "value": ".319"
          }
        ]
      },
      "player_advanced_stats": {
        "coverage_type": "season",
        "coverage_value": "2019",
        "stats": [
          {
            "stat_id": "1035",
            "value": "15.1"
          },
          {
            "stat_id": "1008",
            "value": "1.6"
          },
          {
            "stat_id": "1013",
            "value": ".329"
          },
          {
            "stat_id": "1002",
            "value": ".193"
          },
          {
            "stat_id": "1001",
            "value": "88.3"
          },
          {
            "stat_id": "1014",
            "value": ".373"
          },
          {
            "stat_id": "1015",
            "value": "27.5"
          },
          {
            "stat_id": "1011",
            "value": "100"
          },
          {
            "stat_id": "1005",
            "value": "230"
          },
          {
            "stat_id": "1006",
            "value": "225"
          },
          {
            "stat_id": "1009",
            "value": "46.2"
          },
          {
            "stat_id": "1007",
            "value": "139"
          },
          {
            "stat_id": "1010",
            "value": "28.5"
          },
          {
            "stat_id": "1016",
            "value": "136"
          },
          {
            "stat_id": "1004",
            "value": "3.64"
          },
          {
            "stat_id": "1039",
            "value": "60.0"
          },
          {
            "stat_id": "1012",
            "value": ".129"
          },
          {
            "stat_id": "1003",
            "value": "18"
          },
          {
            "stat_id": "1017",
            "value": "-5.64"
          },
          {
            "stat_id": "1040",
            "value": "2.8"
          },
          {
            "stat_id": "1041",
            "value": "0.0"
          },
          {
            "stat_id": "1042",
            "value": "1.90"
          }
        ]
      }
    }
  ]
}