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 roster = await yf.team.roster(team_key);
} catch (e) {
  // handle error
}

// callback based
yf.team.roster(team_key, callbackFn);

{
  "team_key": "328.l.34014.t.1",
  "team_id": "1",
  "name": "ChicksDigTheLongBall",
  "url": "http://baseball.fantasysports.yahoo.com/b1/34014/1",
  "team_logo": "http://l.yimg.com/dh/ap/fantasy/img/mlb/icon_6_lg.gif",
  "waiver_priority": 4,
  "number_of_moves": "19",
  "number_of_trades": 0,
  "clinched_playoffs": 1,
  "managers": [
    {
      "manager_id": "1",
      "nickname": "--hidden--",
      "guid": "RYWP7M53IC626MGOX36ZWCM4FA",
      "is_commissioner": "1"
    }
  ],
  "roster": [
    {
      "player_key": "328.p.7276",
      "player_id": "7276",
      "name": {
        "full": "Dioner Navarro",
        "first": "Dioner",
        "last": "Navarro",
        "ascii_first": "Dioner",
        "ascii_last": "Navarro"
      },
      "editorial_player_key": "mlb.p.7276",
      "editorial_team_key": "mlb.t.14",
      "editorial_team_full_name": "Toronto Blue Jays",
      "editorial_team_abbr": "Tor",
      "uniform_number": "30",
      "display_position": "C",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/kOsVClMYWdAbQ9jafx4DdQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/7276.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "C",
        "Util"
      ]
    },
    {
      "player_key": "328.p.8640",
      "player_id": "8640",
      "name": {
        "full": "Chris Carter",
        "first": "Chris",
        "last": "Carter",
        "ascii_first": "Chris",
        "ascii_last": "Carter"
      },
      "editorial_player_key": "mlb.p.8640",
      "editorial_team_key": "mlb.t.18",
      "editorial_team_full_name": "Houston Astros",
      "editorial_team_abbr": "Hou",
      "uniform_number": "23",
      "display_position": "1B,OF",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/CbJLLSscA5KlmDx6ViDAEQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8640.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "1B",
        "OF",
        "Util"
      ]
    },
    {
      "player_key": "328.p.7483",
      "player_id": "7483",
      "name": {
        "full": "Aaron Hill",
        "first": "Aaron",
        "last": "Hill",
        "ascii_first": "Aaron",
        "ascii_last": "Hill"
      },
      "editorial_player_key": "mlb.p.7483",
      "editorial_team_key": "mlb.t.29",
      "editorial_team_full_name": "Arizona Diamondbacks",
      "editorial_team_abbr": "Ari",
      "uniform_number": "2",
      "display_position": "2B,3B",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/_gTORgzx8pE0wjbcWkV7Jg--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/7483.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "2B",
        "3B",
        "Util"
      ]
    },
    {
      "player_key": "328.p.7163",
      "player_id": "7163",
      "name": {
        "full": "Miguel Cabrera",
        "first": "Miguel",
        "last": "Cabrera",
        "ascii_first": "Miguel",
        "ascii_last": "Cabrera"
      },
      "editorial_player_key": "mlb.p.7163",
      "editorial_team_key": "mlb.t.6",
      "editorial_team_full_name": "Detroit Tigers",
      "editorial_team_abbr": "Det",
      "uniform_number": "24",
      "display_position": "1B,3B",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/iRF.VaCf.VAeG1P2pbNaLQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/7163.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "1B",
        "3B",
        "Util"
      ]
    },
    {
      "player_key": "328.p.7066",
      "player_id": "7066",
      "name": {
        "full": "José Reyes",
        "first": "José",
        "last": "Reyes",
        "ascii_first": "Jose",
        "ascii_last": "Reyes"
      },
      "editorial_player_key": "mlb.p.7066",
      "editorial_team_key": "mlb.t.14",
      "editorial_team_full_name": "Toronto Blue Jays",
      "editorial_team_abbr": "Tor",
      "uniform_number": "7",
      "display_position": "SS",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/NvuJPYFTGVZA26PUBl9HJg--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/7066.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "SS",
        "Util"
      ]
    },
    {
      "player_key": "328.p.8412",
      "player_id": "8412",
      "name": {
        "full": "Austin Jackson",
        "first": "Austin",
        "last": "Jackson",
        "ascii_first": "Austin",
        "ascii_last": "Jackson"
      },
      "editorial_player_key": "mlb.p.8412",
      "editorial_team_key": "mlb.t.12",
      "editorial_team_full_name": "Seattle Mariners",
      "editorial_team_abbr": "Sea",
      "uniform_number": "16",
      "display_position": "OF",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/mFHcwXfS3ynlxYlFeMA2Vw--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8412.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "OF",
        "Util"
      ]
    },
    {
      "player_key": "328.p.8213",
      "player_id": "8213",
      "name": {
        "full": "Denard Span",
        "first": "Denard",
        "last": "Span",
        "ascii_first": "Denard",
        "ascii_last": "Span"
      },
      "editorial_player_key": "mlb.p.8213",
      "editorial_team_key": "mlb.t.20",
      "editorial_team_full_name": "Washington Nationals",
      "editorial_team_abbr": "Was",
      "uniform_number": "2",
      "display_position": "OF",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/7T3oMXiGGMY_nIj8A0ctgQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8213.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "OF",
        "Util"
      ]
    },
    {
      "player_key": "328.p.8117",
      "player_id": "8117",
      "name": {
        "full": "Steve Pearce",
        "first": "Steve",
        "last": "Pearce",
        "ascii_first": "Steve",
        "ascii_last": "Pearce"
      },
      "editorial_player_key": "mlb.p.8117",
      "editorial_team_key": "mlb.t.1",
      "editorial_team_full_name": "Baltimore Orioles",
      "editorial_team_abbr": "Bal",
      "uniform_number": "28",
      "display_position": "1B,OF",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/pFOvtySofgL..r8lpyhq3A--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8117.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "1B",
        "OF",
        "Util"
      ]
    },
    {
      "player_key": "328.p.8169",
      "player_id": "8169",
      "name": {
        "full": "Alexei Ramírez",
        "first": "Alexei",
        "last": "Ramírez",
        "ascii_first": "Alexei",
        "ascii_last": "Ramirez"
      },
      "editorial_player_key": "mlb.p.8169",
      "editorial_team_key": "mlb.t.4",
      "editorial_team_full_name": "Chicago White Sox",
      "editorial_team_abbr": "CWS",
      "uniform_number": "10",
      "display_position": "SS",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/kA6klmisBnjzZwpMg3YRmw--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8169.1.jpg",
      "is_undroppable": "0",
      "position_type": "B",
      "eligible_positions": [
        "SS",
        "Util"
      ]
    },
    {
      "player_key": "328.p.8554",
      "player_id": "8554",
      "name": {
        "full": "Doug Fister",
        "first": "Doug",
        "last": "Fister",
        "ascii_first": "Doug",
        "ascii_last": "Fister"
      },
      "editorial_player_key": "mlb.p.8554",
      "editorial_team_key": "mlb.t.20",
      "editorial_team_full_name": "Washington Nationals",
      "editorial_team_abbr": "Was",
      "uniform_number": "58",
      "display_position": "SP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/YydEMGu1uRLY_CiidLbXHQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8554.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP"
      ]
    },
    {
      "player_key": "328.p.8167",
      "player_id": "8167",
      "name": {
        "full": "Hiroki Kuroda",
        "first": "Hiroki",
        "last": "Kuroda",
        "ascii_first": "Hiroki",
        "ascii_last": "Kuroda"
      },
      "headshot": "http://l.yimg.com/iu/api/res/1.2/2ikisPv2pASBp0vUbxzcbw--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8167.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP"
      ]
    },
    {
      "player_key": "328.p.6525",
      "player_id": "6525",
      "name": {
        "full": "Mark Buehrle",
        "first": "Mark",
        "last": "Buehrle",
        "ascii_first": "Mark",
        "ascii_last": "Buehrle"
      },
      "editorial_player_key": "mlb.p.6525",
      "editorial_team_key": "mlb.t.14",
      "editorial_team_full_name": "Toronto Blue Jays",
      "editorial_team_abbr": "Tor",
      "uniform_number": "56",
      "display_position": "SP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/i2GmbD71kkgSKCcpIktTkQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/6525.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP"
      ]
    },
    {
      "player_key": "328.p.9334",
      "player_id": "9334",
      "name": {
        "full": "Kevin Gausman",
        "first": "Kevin",
        "last": "Gausman",
        "ascii_first": "Kevin",
        "ascii_last": "Gausman"
      },
      "editorial_player_key": "mlb.p.9334",
      "editorial_team_key": "mlb.t.1",
      "editorial_team_full_name": "Baltimore Orioles",
      "editorial_team_abbr": "Bal",
      "uniform_number": "39",
      "display_position": "SP,RP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/ogJnNTQCWTXRN5OTp2dIuw--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/9334.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP",
        "RP"
      ]
    },
    {
      "player_key": "328.p.8773",
      "player_id": "8773",
      "name": {
        "full": "Greg Holland",
        "first": "Greg",
        "last": "Holland",
        "ascii_first": "Greg",
        "ascii_last": "Holland"
      },
      "editorial_player_key": "mlb.p.8773",
      "editorial_team_key": "mlb.t.7",
      "editorial_team_full_name": "Kansas City Royals",
      "editorial_team_abbr": "KC",
      "uniform_number": "56",
      "display_position": "RP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/kNHExdlbfptjOyuMDERWiQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8773.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "RP"
      ]
    },
    {
      "player_key": "328.p.8176",
      "player_id": "8176",
      "name": {
        "full": "Jake McGee",
        "first": "Jake",
        "last": "McGee",
        "ascii_first": "Jake",
        "ascii_last": "McGee"
      },
      "editorial_player_key": "mlb.p.8176",
      "editorial_team_key": "mlb.t.30",
      "editorial_team_full_name": "Tampa Bay Rays",
      "editorial_team_abbr": "TB",
      "uniform_number": "57",
      "display_position": "RP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/D0vSgATUgd9Q0qUmMFfPnw--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/8176.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "RP"
      ]
    },
    {
      "player_key": "328.p.7484",
      "player_id": "7484",
      "name": {
        "full": "Brandon McCarthy",
        "first": "Brandon",
        "last": "McCarthy",
        "ascii_first": "Brandon",
        "ascii_last": "McCarthy"
      },
      "headshot": "http://l.yimg.com/iu/api/res/1.2/hwNAziEnZUZ9jzhoKRevnA--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/7484.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP"
      ]
    },
    {
      "player_key": "328.p.5763",
      "player_id": "5763",
      "name": {
        "full": "Bartolo Colón",
        "first": "Bartolo",
        "last": "Colón",
        "ascii_first": "Bartolo",
        "ascii_last": "Colon"
      },
      "editorial_player_key": "mlb.p.5763",
      "editorial_team_key": "mlb.t.21",
      "editorial_team_full_name": "New York Mets",
      "editorial_team_abbr": "NYM",
      "uniform_number": "40",
      "display_position": "SP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/eEfOghjyp_ulwInr12a.pQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/5763.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP"
      ]
    },
    {
      "player_key": "328.p.9019",
      "player_id": "9019",
      "name": {
        "full": "Wily Peralta",
        "first": "Wily",
        "last": "Peralta",
        "ascii_first": "Wily",
        "ascii_last": "Peralta"
      },
      "editorial_player_key": "mlb.p.9019",
      "editorial_team_key": "mlb.t.8",
      "editorial_team_full_name": "Milwaukee Brewers",
      "editorial_team_abbr": "Mil",
      "uniform_number": "38",
      "display_position": "SP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/ZSuXxw7.5p13MP1x6pnVUQ--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/9019.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP"
      ]
    },
    {
      "player_key": "328.p.7779",
      "player_id": "7779",
      "name": {
        "full": "James Shields",
        "first": "James",
        "last": "Shields",
        "ascii_first": "James",
        "ascii_last": "Shields"
      },
      "headshot": "http://l.yimg.com/iu/api/res/1.2/xKmGmi3TRxpDor.2kAC2Tg--/YXBwaWQ9eXZpZGVvO…g--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20130405/7779.1.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP"
      ]
    },
    {
      "player_key": "328.p.9140",
      "player_id": "9140",
      "name": {
        "full": "Drew Smyly",
        "first": "Drew",
        "last": "Smyly",
        "ascii_first": "Drew",
        "ascii_last": "Smyly"
      },
      "editorial_player_key": "mlb.p.9140",
      "editorial_team_key": "mlb.t.30",
      "editorial_team_full_name": "Tampa Bay Rays",
      "editorial_team_abbr": "TB",
      "uniform_number": "33",
      "display_position": "SP,RP",
      "headshot": "http://l.yimg.com/iu/api/res/1.2/74J.jivrFHaJvz7c9G6RBQ--/YXBwaWQ9eXZpZGVvO…0Ng--/http://l.yimg.com/j/assets/i/us/sp/v/mlb/players_l/20120530/9140.jpg",
      "is_undroppable": "0",
      "position_type": "P",
      "eligible_positions": [
        "SP",
        "RP"
      ]
    }
  ]
}