35 lines
973 B
Plaintext
35 lines
973 B
Plaintext
---
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title: Enable compression for WebSocket messages
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sidebarTitle: Enable compression
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mode: center
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---
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Set the `perMessageDeflate` parameter to enable the [permessage-deflate](https://tools.ietf.org/html/rfc7692) WebSocket extension. Bun then negotiates compression with clients that support it. Messages sent with `ws.send()` are still uncompressed unless you opt in per message (see below).
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```ts server.ts icon="/icons/typescript.svg"
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Bun.serve({
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// ...
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websocket: {
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// enable compression
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perMessageDeflate: true,
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},
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});
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```
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---
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To enable compression for individual messages, pass `true` as the second parameter to `ws.send()`. This requires `perMessageDeflate` to be enabled; otherwise Bun sends the message uncompressed.
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```ts server.ts icon="/icons/typescript.svg"
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Bun.serve({
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// ...
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websocket: {
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perMessageDeflate: true,
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async message(ws, message) {
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// send a compressed message
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ws.send(message, true);
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},
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},
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});
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```
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