League SDK

Typed TypeScript SDK for Riot LoL API. Handles routing, PUUID conversions, rate limiting.

LoL API Concepts

Scope: This SDK covers League of Legends only. TFT, Valorant, Wild Rift have separate APIs.

PUUID: Universal ID across Riot games. Preferred over SummonerId/AccountId (deprecated).

Platform: Use player's server (kr for Korean, euw1 for EU West). Wrong platform = 404.

Queue IDs: 420 Solo/Duo, 440 Flex, 450 ARAM, 400 Normal Draft, 430 Blind

Timestamps: Unix epoch milliseconds → new Date(match.gameCreation)

Match history: Riot retains ~2 years. Older matches may be unavailable.

Patterns

import { LolClient, NotFoundError, RateLimitError } from 'league-sdk';

const client = new LolClient({
  apiKey: process.env.RIOT_API_KEY!,
  platform: 'na1'
});

// Player lookup
const player = await client.players.getByRiotId('Name', 'Tag');

// Ranked stats
const soloQ = await player.getSoloQueueStats();
// soloQ.tier, soloQ.division, soloQ.winRate (0-1 decimal)

// Match history
const matches = await player.getMatches({ count: 10, queue: 420 }); // 420 = ranked
for (const match of matches) {
  const p = match.getParticipant(player.puuid)!;
  console.log(`${p.championName} ${p.kills}/${p.deaths}/${p.assists} - ${p.win ? 'W' : 'L'}`);
}

// Participant stats
const p = match.getParticipant(player.puuid)!;
p.kills; p.deaths; p.assists; p.kda;
p.championName; p.win;
p.items;          // { item0-5, trinket }
p.totalCs; p.csPerMinute;
p.damage.toChampions; p.damage.taken;
p.goldEarned; p.visionScore;

// Match stats
match.gameDurationFormatted;  // "32:15"
match.queueName;              // "Ranked Solo/Duo"
match.blueTeam; match.redTeam;
match.getWinner(); match.didPlayerWin(player.puuid);

// Team comparison
const { blueTeam, redTeam } = match;
console.log(`Blue: ${blueTeam.totalKills}K, ${blueTeam.totalGold}g`);

// Live game (null if not in game)
const game = await player.getLiveGame();

// Mastery
const top = await player.getTopMastery(3);
// m.championName, m.championPoints, m.championLevel

// Static data (no API key needed)
const champs = await client.dataDragon.getChampions();
const items = await client.dataDragon.getItems();
await client.dataDragon.getChampionIconUrl('Ahri');
await client.dataDragon.getItemIconUrl(3157);

Asset Downloads

npx league-sdk-assets --output ./assets --all

Programmatic: import { downloadAllAssets } from 'league-sdk/scripts'

Platforms

na1 euw1 eun1 kr jp1 br1 la1 la2 oc1 tr1 ru sg2 ph2 th2 tw2 vn2

Troubleshooting

• 401: API key expired (dev keys last 24h)
• 404: Wrong platform or player doesn't exist
• 429: Rate limited (SDK handles automatically)
• NotFoundError: Player/match doesn't exist
• RateLimitError: Has retryAfter property (seconds)
• AuthenticationError: Invalid API key