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# Tracing
<!--introduced_in=v7.7.0-->
Trace Event provides a mechanism to centralize tracing information generated by
V8, Node core, and userspace code.
Tracing can be enabled by passing the `--trace-events-enabled` flag when starting a
Node.js application.
The set of categories for which traces are recorded can be specified using the
`--trace-event-categories` flag followed by a list of comma separated category names.
By default the `node`, `node.async_hooks`, and `v8` categories are enabled.
```txt
node --trace-events-enabled --trace-event-categories v8,node,node.async_hooks server.js
```
Running Node.js with tracing enabled will produce log files that can be opened
in the [`chrome://tracing`](https://www.chromium.org/developers/how-tos/trace-event-profiling-tool)
tab of Chrome.
Starting with Node 10.0.0, the tracing system uses the same time source as the
one used by `process.hrtime()` however the trace-event timestamps are expressed
in microseconds, unlike `process.hrtime()` which returns nanoseconds.
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