Koa v2 is now the default. For Koa v1 support install with koa-websocket@2 and see the legacy branch.

Supports ws:// and wss://

npm install koa-websocket

See examples directory for a simple implementation.

Example with Let's Encrypt (the Greenlock package):

const Koa = require('koa');
const greenlock = require('greenlock-express');
const websockify = require('koa-websocket');
 
const le = greenlock.create({
  // all your sweet Let's Encrypt options here
});
 
// the magic happens right here
const app = websockify(new Koa(), wsOptions, le.httpsOptions);
 
app.ws.use((ctx) => {
   // the websocket is added to the context as `ctx.websocket`.
  ctx.websocket.on('message', function(message) {
    // do something
  });
});
 
app.listen(3000);

The WebSocket options object just get passed right through to the new WebSocketServer(options) call.

The optional HTTPS options object gets passed right into https.createServer(options). If the HTTPS options are passed in, koa-websocket will use the built-in Node HTTPS server to provide support for the wss:// protocol.

MIT