Granted, I’m in the B2B software space, so end-user expectations are those of accuracy, consistency and performance. I imagine expectations (or perhaps priorities) are different for consumer-facing applications.
I don't feel it's too much of a stretch to assume that most people doing SPA are probably using node on the server and something like Redux. Then it's a matter of "hydrating" the Redux store + React. Which basically amounts to serialization of the data and passing it to the client via a global variable embedded in the source of the HTML page. When done in this manner, the modelling and fetching of data is identical on the client and the server.
> I’m in the B2B software space
Does your software act like an application? I really feel like B2B is the place to use SPA. You have a login, some sort of dashboard, the user interacts and modifies things. SPA is really slick in this use case. Where SPA falls apart is when you need to present your site as individual pages to Google for SEO and try to get some of the benefits of SPA. That's a nightmare to get right and to maintain.
For B2B I would not use SPA on the marketing, landing, pricing, signup pages and use SPA for the application, itself. Effectively a dual site. Which works really well.
[0]: https://dotnet.microsoft.com/en-us/apps/aspnet/web-apps/blaz...
[1]: https://fable.io/
btw. most of the time I wish my company used such things or that code would be more isomorphic, BUT!!! most of the time isomorphic models lead to way more problem, especially when it comes to validation.
1: https://github.com/ferdikoomen/openapi-typescript-codegen
By the way, echoing some discussion above, we migrated from Express to NestJS, and it was an excellent decision.
After the migration to TS, I really want something I can use to model the data once and use in both the backend and frontend, because its very repetitive. Haven't found anything yet.