ASP.NET Core: when environments are not enough, use sub-environments!

Out of the box, ASP.NET Core has the concept of “environments”, which allows your app to use different settings based on which environment it's running in. For instance, you can have Development/Staging/Production environments, each with its own settings file, and a common settings file shared by all environments: appsettings.json: global settings appsettings.Development.json: settings specific to the Development environment appsettings.Staging.json: settings specific to the Staging environment appsettings.Production.json: settings specific to the Production environment With the default configuration, environment-specific settings just override global settings, so you don't have to specify unchanged settings in every environment if they're already specified in the global settings file.