appsettings.json configuration

appsettings.json is the standard configuration file for .NET applications, using JSON format.

Basic Example

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning"
    }
  },
  "ConnectionStrings": {
    "DefaultConnection": "Server=localhost;Database=MyDb;"
  },
  "AppSettings": {
    "ApplicationName": "MyApp",
    "Version": "1.0.0"
  }
}

Reading Configuration

using Microsoft.Extensions.Configuration;

var config = new ConfigurationBuilder()
    .AddJsonFile("appsettings.json")
    .Build();

string appName = config["AppSettings:ApplicationName"];
Console.WriteLine($"App: {appName}");

Environment-Specific Files

• appsettings.Development.json
• appsettings.Production.json