@buzzr/dfs-engine-espn

ESPN data adapter for @buzzr/dfs-engine. Fetches gamelogs, boxscores, and injury reports from ESPN's public site API and shapes them into the data structures dfs-engine adapters consume.

npm install @buzzr/dfs-engine @buzzr/dfs-engine-espn

Why a companion package

@buzzr/dfs-engine is pure grading + payout math. It accepts a PlayerGameLogEntryShape and returns the value to grade against the line. You're responsible for the data.

This package is the "give me data" half: fetch from ESPN, convert to the right shape, hand it to dfs-engine. Use it together or substitute your own data source.

Quickstart

import { fetchPlayerGamelog, gamelogEntryToShape } from '@buzzr/dfs-engine-espn';
import { extractStatForProp, matchGameLogEntry } from '@buzzr/dfs-engine';

// Fetch a player's recent gamelog.
const entries = await fetchPlayerGamelog('3917376', 'NBA'); // Jayson Tatum

// Pick the entry matching the bet date.
const matched = matchGameLogEntry('2026-05-04T20:00:00Z', entries);
if (!matched) return null;

// Convert to dfs-engine's shape and grade.
const shape = gamelogEntryToShape(matched);
const points = extractStatForProp('Points', 'NBA', shape, 'prizepicks');
// → 28

What's in here

Module	Function
boxscore	fetchGameBoxScore(league, eventId) — per-game stats for live + final games. Returns BoxScore with home/away BoxScoreTeam blocks. NBA/WNBA/NCAAM/W/NHL coverage.
gamelog	fetchPlayerGamelog(athleteId, league) — season-level per-game history. NBA/WNBA/NCAAM/W/NFL/MLB/NHL coverage.
injuries	fetchInjuryStatus(athleteId, league) — current injury status. isAutoDnpStatus predicate for "this leg should auto-DNP."
converter	gamelogEntryToShape(entry) — convert this package's PlayerGameLogEntry to dfs-engine's PlayerGameLogEntryShape.

Custom fetch / timeouts

Every public fetcher accepts an options bag for fetch (override for caching, proxying, or testing) and timeoutMs:

await fetchGameBoxScore('NBA', 'event-123', {
  fetch: myCachedFetch,
  timeoutMs: 5000,
});

Status & limitations

• NFL / MLB on fetchGameBoxScore: not yet flattened — ESPN's boxscore ships multi-category data (passing / rushing for NFL, batting / pitching for MLB) that this parser doesn't yet collapse correctly. Use fetchPlayerGamelog for those leagues meanwhile.
• Soccer on gamelog: not yet implemented; soccer slips currently need a different data source.
• ESPN ToS: Endpoints are public but undocumented. Respect reasonable request volume (~1 req/sec per endpoint empirically safe). Use at your own risk.
• Coverage drift: If ESPN changes a response shape, the parser may silently return null. File an issue with a captured response.

License

MIT © Sarvesh Chidambaram