Pairing .NET APIs with an Angular Frontend

A .NET backend and an Angular frontend is a common pairing, but a few small decisions make the integration much smoother.

Shape DTOs for the frontend, not the database

It's tempting to serialize EF Core entities directly. Instead, map to a DTO that matches what the Angular service actually needs — it avoids leaking internal fields and keeps the frontend's TypeScript interfaces stable even when the schema changes.

Centralize HTTP error handling

Angular's HttpClient interceptors are the right place to normalize .NET's ProblemDetails error responses into a shape your components can render consistently, instead of every component parsing errors differently.

CORS is a backend concern, not a frontend workaround

If a request fails with a CORS error in the browser console, the fix belongs in the .NET Program.cs CORS policy — not in a proxy hack on the Angular side. Getting this right once avoids repeated confusion later.