Can't speak for the rest of the world, but my team has been using an NX monorepo with a standard types library that can be imported into any application in the

Can't speak for the rest of the world, but my team has been using an NX monorepo with a standard types library that can be imported into any application in the monorepo. It is trivial to use the same interface, enum, class, or other type-enforcing mechanism across multiple frontend and backend services. The development experience has been quite nice, and refactoring/changing the data structures is a breeze. If you are in the Typescript world and haven't looked at NX...check it out. By the way, echoing some discussion above, we migrated from Express to NestJS, and it was an excellent decision.