Add appsettings.json to .NET 6 Console App

 When you start a new .NET 6 Console app, you will have little more than what you see here.  

If one wants to use the json configuration files typically used in a web app, there are a few things we need to add.

(1) Add package references to the following: 
Microsoft.Extensions.Configuration
Microsoft.Extensions.Configuration.Json
Microsoft.Extensions.Configuration.FileExtensions

(2) Right-click on the project, add new item, Json configuration file. Call it "appsettings.json". Then add some settings in the file, eg. 

{

  "TestSettings": {

    "Option1": "some string value",

    "Option2": 42

  }

}

Now just setup your host and builder, read the config file values and use them. In program.cs use something like this

using Microsoft.Extensions.Configuration;

var builder = new ConfigurationBuilder()

    .SetBasePath(Directory.GetCurrentDirectory())

    .AddJsonFile("appsettings.json", optional: false);

IConfiguration config = builder.Build();

var Option1 = config.GetSection("TestSettings:Option1");

string Opt = Option1.Value;

Console.WriteLine($"The answer is {Opt}");