ESPN Fantasy WNBA API

The first and only public API for ESPN's Fantasy WNBA

This library provides access to ESPN's internal Fantasy WNBA endpoints, reverse-engineered and documented for public use.

Prerequisites

This package is designed for Node.js environments and requires:

npm install node-fetch  # Required dependency

Installation

Since this package isn't published to npm yet, install directly from GitHub:

npm install matthewh8/espn-fantasy-wnba-api
npm install node-fetch  # Required dependency

Quick Start

import ESPNWNBAFantasyAPI from 'espn-fantasy-wnba-api';

// Public data (no authentication)
const api = new ESPNWNBAFantasyAPI();
const players = await api.getAllPlayers();

// Private league data (requires ESPN cookies)
const privateApi = new ESPNWNBAFantasyAPI({
    espnS2: 'your_espn_s2_cookie',
    swid: 'your_swid_cookie'
});

const rosters = await privateApi.getLeagueRosters('YOUR_LEAGUE_ID_HERE');

Authentication

For private league data, you need ESPN authentication cookies:

Go to ESPN Fantasy WNBA in your browser
Open DevTools (F12) → Application → Cookies → espn.com
Copy espn_s2 and SWID values

Available Methods

Public Endpoints (No Auth Required)

getAllPlayers(scoringPeriodId?) - All WNBA players with ownership data
getProTeamSchedules() - WNBA team schedules
getGameState() - Current game state info

Private Endpoints (Auth Required)

getLeagueRosters(leagueId) - All team rosters in league
getLeagueSettings(leagueId) - League scoring settings
getPendingTransactions(leagueId) - Waivers and pending trades
getCurrentMatchups(leagueId, scoringPeriodId?) - Current week matchups
getScoreboard(leagueId, scoringPeriodId?) - League scoreboard

Example: Get Team Rosters

const api = new ESPNWNBAFantasyAPI({
    espnS2: 'your_cookie',
    swid: 'your_swid'
});

const data = await api.getLeagueRosters('YOUR_LEAGUE_ID_HERE');
const rosters = api.extractRosters(data);

rosters.forEach(team => {
    console.log(`${team.name}:`);
    team.players.forEach(player => {
        console.log(`  - ${player.name}`);
    });
});

Troubleshooting

Common Issues:

"fetch is not defined" - Make sure you've installed node-fetch
401 Unauthorized - Check that your ESPN cookies are valid and not expired
Module not found - Ensure you're using Node.js 14+ with ES modules support

Getting Your League ID: Your league ID can be found in the URL when viewing your ESPN Fantasy WNBA league: https://fantasy.espn.com/basketball/league?leagueId=YOUR_LEAGUE_ID_HERE

Discovered Endpoints

This API exposes ESPN's internal Fantasy WNBA endpoints. All discovered endpoints are documented in the source code for developers who want to expand functionality.

Base URL: https://lm-api-reads.fantasy.espn.com/apis/v3/games/wfba

Game Code: wfba (Women's Fantasy Basketball Association)

Environment Support

Node.js: 14.0.0 or higher
ES Modules: Required
Browser: Not supported (due to CORS restrictions)

Contributing

Found more endpoints or want to add features? PRs welcome!

License

MIT - Use freely for personal or commercial projects.

Package detail