µWebSockets.js™ (it's "micro") is simple, secure^[1] & standards compliant web I/O for the most demanding^[2] of applications.

• TypeScript docs • Read more & user manual (C++ project)

In a nutshell.

µWebSockets.js is the Google V8 bindings to µWebSockets, one of the most efficient web servers available for C++ programming^[2]. Bypassing the entire I/O stack of Node.js allows for unprecedented efficiency in back-end JavaScript - what you build stands on nothing but the best of C and C++. Scales to millions of active WebSockets using half a GB of user space memory^[3].

npm install uNetworking/uWebSockets.js#v15.9.0

, or any such tag (see releases).

Simple.

There are tons of examples but here's the gist of it all:

const uWS = require('uWebSockets.js');

/* Non-SSL is simply uWS.App() */
uWS.SSLApp({
  /* There are tons of SSL options */
  key_file_name: 'misc/key.pem',
  cert_file_name: 'misc/cert.pem',
}).ws('/*', {
  /* For brevity we skip the other events */
  message: (ws, message, isBinary) => {
    let ok = ws.send(message, isBinary);
  }
}).any('/*', (res, req) => {
  /* Let's deny all Http */
  res.end('Nothing to see here!');
}).listen(9001, (listenSocket) => {
  if (listenSocket) {
    console.log('Listening to port 9001');
  }
});

Pay what you want.

Commercially developed on a sponsored/consulting basis; BitMEX, Bitfinex and Coinbase are current or previous sponsors. Contact me, the author for support, feature development or consulting/contracting.

µWebSockets.js is intellectual property licensed Apache 2.0 with limitations on trademark use. Forks must be clearly labelled as such and must not be confused with the original.