Overriding settings via environment variables, command line?

Short answer: ✅ ASP.NET Core supports hierarchical override of config sources: Environment variables override appsettings.json: MyApp__Logging__LogLevel__Default=Warning Command line arguments override everything: dotnet run --Logging:LogLevel:Default=Debug

Real-world example (ShopNest)

ShopNest registers AppDbContext as Scoped and IMemoryCache as Singleton. Putting DbContext in a Singleton causes threading bugs.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.