uwebsockets

Simple, secure¹ & standards compliant² web server for the most demanding³ of applications. Read more...

⚡ Simple performance

µWebSockets.js is a web server bypass for Node.js that reimplements eventing, networking, encryption, web protocols, routing and pub/sub in highly optimized C++. As such, µWebSockets.js delivers web serving for Node.js, 8.5x that of Fastify and at least 10x that of Socket.IO. It is also the built-in web server of Bun.

• Browse the documentation and see the main repo. There are tons of examples but here's the gist of it all:

/* Non-SSL is simply App() */
require("uWebSockets.js")
  .SSLApp({
    /* There are more SSL options, cut for brevity */
    key_file_name: "misc/key.pem",
    cert_file_name: "misc/cert.pem",
  })
  .ws("/*", {
    /* There are many common helper features */
    idleTimeout: 32,
    maxBackpressure: 1024,
    maxPayloadLength: 512,
    compression: DEDICATED_COMPRESSOR_3KB,

    /* For brevity we skip the other events (upgrade, open, ping, pong, close) */
    message: (ws, message, isBinary) => {
      /* You can do app.publish('sensors/home/temperature', '22C') kind of pub/sub as well */

      /* Here we echo the message back, using compression if available */
      let ok = ws.send(message, isBinary, true);
    },
  })
  .get("/*", (res, req) => {
    /* It does Http as well */
    res
      .writeStatus("200 OK")
      .writeHeader("IsExample", "Yes")
      .end("Hello there!");
  })
  .listen(9001, (listenSocket) => {
    if (listenSocket) {
      console.log("Listening to port 9001");
    }
  });