Merging appsettings with environment variables in .NET Core

docker .net-core environment-variables config

config.    AddJsonFile("appsettings.json").    AddJsonFile("appsettings.docker.json", true).    AddEnvironmentVariables();

is actually enough to override appsettings values using environment variables.

Let's say you have the following in your appsettings.json file;

{  "Logging": {      "Level": "Debug"  }}

you can override value of Logging.Level by setting the environment variable named Logging:Level to the value of your preference.

Be aware that : is used to specify nested properties in environment variable keys.

Also note: from docs;

If a colon (:) can't be used in environment variable names on your system, replace the colon (:) with a double-underscore (__).

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