[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Tracing](./puppeteer.protocol.tracing.md) > [TracingCompleteEvent](./puppeteer.protocol.tracing.tracingcompleteevent.md) > [traceFormat](./puppeteer.protocol.tracing.tracingcompleteevent.traceformat.md) ## Protocol.Tracing.TracingCompleteEvent.traceFormat property Trace data format of returned stream. Signature: ```typescript traceFormat?: StreamFormat; ```