PartyKit Has a Free API That Makes Real-Time Multiplayer Apps Simple

PartyKit is the platform for real-time, multiplayer, and AI applications. Build collaborative features with WebSockets, state machines, and AI in minutes. Party Server: Stateful WebSocket // party/main.ts import type { Party , Connection , ConnectionContext } from " partykit/server " ; export default class ScrapingRoom implements Party . Server { connections : Map < string , Connection > = new Map (); products : Product [] = []; onConnect ( conn : Connection , ctx : ConnectionContext ) { // Send current state to new connection conn . send ( JSON . stringify ({ type : " init " , products : this . products })); } onMessage ( message : string , sender : Connection ) { const data = JSON . parse ( message ); switch ( data . type ) { case " add-product " : this . products . push ( data . product ); // Broadcast to ALL connected clients this . room . broadcast ( JSON . stringify ({ type : " product-added " , product : data . product , })); break ; case " update-price " : const product = this