Feathers vs Nest
Nest is a backend framework that have similar capabilities with Feathers.
Nest uses dependency injection system and a module based architecture, Feathers uses service based architecture with a more functional approach.
Feathers can generate client code for its server, Nest can't.
Nest uses RxJS for running interceptors, guards, filters or validation pipes. Feathers uses before, after and around hooks.
For more details on the difference between them you can read more here: FeathersJS vs NestJS - Compared In 3 Key Areas