[Home](./index.md) > [@snowplow/react-native-tracker](./react-native-tracker.md) > [SubjectConfiguration](./react-native-tracker.subjectconfiguration.md) > [networkUserId](./react-native-tracker.subjectconfiguration.networkuserid.md) ## SubjectConfiguration.networkUserId property Override the network user id (UUIDv4) that is assigned by the collector and stored in cookies Signature: ```typescript networkUserId?: string; ```