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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [Protocol](./puppeteer.protocol.md) &gt; [Tracing](./puppeteer.protocol.tracing.md) &gt; [StartRequest](./puppeteer.protocol.tracing.startrequest.md) &gt; [streamFormat](./puppeteer.protocol.tracing.startrequest.streamformat.md)

## Protocol.Tracing.StartRequest.streamFormat property

Trace data format to use. This only applies when using `ReturnAsStream` transfer mode (defaults to `json`<!-- -->).

<b>Signature:</b>

```typescript
streamFormat?: StreamFormat;
```