Using configuration in ASP .NET Core based on the video from Rahul Nath.
Updated to .NET 6 where Program.cs has replaced Startup.cs.
The separator to hierarchical keys is the colon (:).
There are other notations. Details @MSDN.
User secrets is a way to store configuration outside of a project.
Indeed its location is %APPDATA%/Roaming/Microsoft/UserSecrets.
It remain in clear text but being stored outside of the project path, accidental pushing to a source code manager is avoided.
We initialize the user secret for our project.
dotnet user-secrets init
Result:
Set UserSecretsId to '125d64bd-97b8-4262-a6fe-9750bae9537b'
for MSBuild project 'D:\Path\Project.csproj'.
This will generate a GUID which will be used as the folder name in the UserSecrets location mentioned above.
In it, a new secrets.json file is created.
dotnet user-secrets set "MyKey" "My Secret Value"