How to setup route for websocket server in express?

Question

I have a setup similar to this one:

var WebSocketServer = require(\"ws\").Server,
    express = require(\"express\"),
    http = require(\"http\"),
    app =         


        

Answer 1

UPDATE Paths are valid in the ws server options.

interface ServerOptions {
        host?: string;
        port?: number;
        backlog?: number;
        server?: http.Server | https.Server;
        verifyClient?: VerifyClientCallbackAsync | VerifyClientCallbackSync;
        handleProtocols?: any;
        path?: string;
        noServer?: boolean;
        clientTracking?: boolean;
        perMessageDeflate?: boolean | PerMessageDeflateOptions;
        maxPayload?: number;
    }

The accepted answer is no longer valid and will throw Frame Header Invalid errors. Pull Request #885.

WS Paths were removed as Lpinca puts it:

The problem here is that each WebSocketServer adds a new listener for the upgrade event on the HTTP server and when that event is emitted, handleUpgrade is called on all servers.

Here is the work around:

const wss1 = new WebSocket.Server({ noServer: true });
const wss2 = new WebSocket.Server({ noServer: true });
const server = http.createServer();

server.on('upgrade', (request, socket, head) => {
  const pathname = url.parse(request.url).pathname;

  if (pathname === '/foo') {
    wss1.handleUpgrade(request, socket, head, (ws) => {
      wss1.emit('connection', ws);
    });
  } else if (pathname === '/bar') {
    wss2.handleUpgrade(request, socket, head, (ws) => {
      wss2.emit('connection', ws);
    });
  } else {
    socket.destroy();
  }
});