[Home](./index.md) > [@snowplow/node-tracker](./node-tracker.md) > [CorePlugin](./node-tracker.coreplugin.md) > [beforeTrack](./node-tracker.coreplugin.beforetrack.md) ## CorePlugin.beforeTrack property Called before the `filter` method is called and before the trackerCore callback fires (if the filter passes) Signature: ```typescript beforeTrack?: (payloadBuilder: PayloadBuilder) => void; ```