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---
name: 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](https://tools.ietf.org/html/rfc7692) WebSocket extension.
```ts
Bun.serve({
// ...
websocket: {
// enable compression
perMessageDeflate: true,
},
});
```
---
To enable compression for individual messages, pass `true` as the second parameter to `ws.send()`.
```ts
Bun.serve({
// ...
websocket: {
async message(ws, message) {
// send a compressed message
ws.send("Hello world!", true);
},
},
});
```
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