[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Tracing](./puppeteer.protocol.tracing.md) > [StartRequest](./puppeteer.protocol.tracing.startrequest.md) ## Protocol.Tracing.StartRequest interface Signature: ```typescript export interface StartRequest ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [bufferUsageReportingInterval](./puppeteer.protocol.tracing.startrequest.bufferusagereportinginterval.md) | number | If set, the agent will issue bufferUsage events at this interval, specified in milliseconds | | [categories](./puppeteer.protocol.tracing.startrequest.categories.md) | string | Category/tag filter | | [options](./puppeteer.protocol.tracing.startrequest.options.md) | string | Tracing options | | [streamCompression](./puppeteer.protocol.tracing.startrequest.streamcompression.md) | [StreamCompression](./puppeteer.protocol.tracing.streamcompression.md) | Compression format to use. This only applies when using ReturnAsStream transfer mode (defaults to none) | | [streamFormat](./puppeteer.protocol.tracing.startrequest.streamformat.md) | [StreamFormat](./puppeteer.protocol.tracing.streamformat.md) | Trace data format to use. This only applies when using ReturnAsStream transfer mode (defaults to json). | | [traceConfig](./puppeteer.protocol.tracing.startrequest.traceconfig.md) | [TraceConfig](./puppeteer.protocol.tracing.traceconfig.md) | | | [transferMode](./puppeteer.protocol.tracing.startrequest.transfermode.md) | ('ReportEvents' \| 'ReturnAsStream') | Whether to report trace events as series of dataCollected events or to save trace to a stream (defaults to ReportEvents). |