Multiplayer API SDK

JavaScript client for the Multiplayer API — no dependencies, no mandatory build step.

JavaScript

Import directly from a module, no install required:

import { Multiplayer } from 'https://multiplayerapi.com/sdk/mp.esm.min.js';

const mp = new Multiplayer({
  key: 'mp_pk_...',
  // Prefer 'session' if the page may be exposed to XSS (tokens die with the tab).
  // store: 'session',
});

Session tokens default to localStorage. Pass store: 'session' or store: 'memory' to reduce XSS impact. Keep a strict Content-Security-Policy on your game origin.

Or via a script tag if your game doesn't use modules:

<script src="https://multiplayerapi.com/sdk/mp.min.js"></script>
<script>const mp = new MP.Multiplayer({ key: 'mp_pk_...' });</script>

File	Format	Usage
mp.esm.min.js	ESM minified	production
mp.esm.js	ESM readable	debugging
mp.min.js	UMD minified	script tag
version.json	JSON	published version

Unity

Add the package from the Package Manager via Git URL, then install com.unity.webrtc to enable peer-to-peer. Without it, the SDK still works: everything goes through the relay.

using MultiplayerApi;

var mp = new Multiplayer("mp_pk_...") { DisplayName = "Alice" };
await mp.Login();
var room = await mp.Quickmatch(new JObject { ["mode"] = "ffa", ["max_players"] = 8 });

Without an SDK

The API is JSON over HTTP: three routes are enough to play (/v1/auth/guest, /v1/rooms/quickmatch, /v1/rt/sync). The OpenAPI 3.1 schema lets you generate a client in any language.