Enable compression for WebSocket messages

Per-message compression can be enabled with the perMessageDeflate parameter. When set, all messages will be compressed using the permessage-deflate WebSocket extension.

server.ts

Bun.serve({  // ...  websocket: {  // enable compression  perMessageDeflate: true,  }, }); 

To enable compression for individual messages, pass true as the second parameter to ws.send().

server.ts

Bun.serve({  // ...  websocket: {  async message(ws, message) {  // send a compressed message  ws.send(message, true);  },  }, }); 

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Enable compression for WebSocket messages