Utilizing perMessageDeflate with a websocket server in conjunction with express: A step-by-step guide

I need to configure a websocket server using perMessageDeflate and express. Currently, my configuration looks like this:

const server = createServer({
  cert: readFileSync('/path/to/cert.pem'),
  key: readFileSync('/path/to/key.pem')
});
const wss = new WebSocketServer({ server });

However, after reading the documentation, I see that I should update it to:

const wss = new WebSocketServer({
  port: 8080,
  perMessageDeflate: {
    zlibDeflateOptions: {
      // See zlib defaults.
      chunkSize: 1024,
      memLevel: 7,
      level: 3
    },

I'm unsure how to incorporate the perMessageDeflate object as an argument in new WebSocketServer({ server }).

Is there a way to include it while still utilizing { server }?

Answer №1

To implement the perMessageDeflate feature with the WebSocketServer using the server object as a parameter, you can update your code like this:

const server = createServer({
  cert: readFileSync('/path/to/cert.pem'),
  key: readFileSync('/path/to/key.pem')
});

const wss = new WebSocketServer({
  server,
  perMessageDeflate: {
    zlibDeflateOptions: {
      // Customized zlib options.
      chunkSize: 1024,
      memLevel: 7,
      level: 3
    }
  }
});

In the provided code snippet, both the server object and the perMessageDeflate configuration are passed to the WebSocketServer constructor.

By passing the server object as an argument, you ensure that the WebSocket server utilizes the existing HTTP/S server. The perMessageDeflate property is included in the configuration object supplied to the WebSocketServer constructor.

This approach allows you to utilize the perMessageDeflate feature while still incorporating the server object into your WebSocket server setup.

Remember to adjust the port number and any other settings as necessary in your actual implementation.

I trust this explanation proves beneficial :)

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