#real-time — 10LOC

Bunintermediate

A WebSocket server using Bun.serve's built-in upgrade

export const wsServer = Bun.serve({
  fetch(req, server) {
    return server.upgrade(req) ? undefined : new Response("Upgrade failed", { status: 500 });
  },
  websocket: {

Bun.serve() upgrades an HTTP request to a WebSocket in the fetch handler and reuses one handler object across every connection, no ws package needed.