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# trace2json
```none {: style="white-space: break-spaces;" .devsite-disable-click-to-copy}
trace2json [options]: Convert a trace from fxt (Fuchsia trace format) to json (Chrome trace format).
Fuchsia trace format: https://fuchsia.googlesource.com/fuchsia/+/HEAD/docs/development/tracing/trace-format/
Chrome trace format: https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/edit
--category=[]: An exact string to match against event categories. Events that do not match will be dropped. This parameter may be specified multiple times.
--help: Print this help message.
--input-file=[]: Read trace from the specified file.
--output-file=[]: Write the converted trace to the specified file.
--pattern=[]: A regular expression to match against event names. Events that do not match will be dropped. This parameter may be specified multiple times.
--system-event-output-file=[]: Optional. Write the system trace events to the specified file in jsonlines format. If provided, the main output file will not contain system trace events.
```