Q:

How to generate the appsettings..json file? 

I have an asp.net core 2 web api which will be deployed across the following environments:
INT, QA, STAGE, PRODUCTION environments. 
Based on the above, I need to have appsettings.<EnvironmentName>.json file for each environment.  From the link : https://docs.microsoft.com/en-us/aspnet/core/fundamentals/environments?view=aspnetcore-2.1  , I see that 
In case of local development environment, the Environment Variable called ASPNETCORE_ENVIRONMENT is set to Development.  In case of the deployment where ASPNETCORE_ENVIRONMENT is not set, the default is Production
I would like to know what are the steps required to take care while preparing the appsettings.<EnvironmentName>.json file for INT, QA and STAGE environment.  Do I need to set the environment explicitly for each environment web server:
set ASPNETCORE_ENVIRONMENT=Development. 
Can anyone help me to by providing their guidance? 

A:

I might be missing something, but this seems pretty straight-forward.  To create the environment-specific setting files, you literally just create them in your project, i.e. create a new file called appsettings.Foo.json in the root of your project.  Visual Studio will automatically put it under appsettings.json as a parent in the Solution Explorer. 
On the server, yes, you'd need to set the environment you want to run under to ASPNETCORE_ENVIRONMENT.  If it's supposed to use appsettings.QA.json, then set it to QA.  That's all there is to it.