# ADVANCED

- [Metadata](/4/advanced/metadata.md)
- [Middleware](/4/advanced/middleware.md): Dubnium has built-in Express middleware functions to manage Records. Data is never sent to the client without your permission.
- [Versioning](/4/advanced/versioning.md)
- [Synchronization](/4/advanced/synchronization.md)
- [Indexing](/4/advanced/indexing.md)
- [Miscellaneous](/4/advanced/miscellaneous.md): Other functions provided by Dubnium.
- [Events](/4/advanced/events.md): Dubnium uses the built-in Events module to send messages when something happens!
- [CLI](/4/advanced/cli.md): Run Dubnium functions from your command-line!