ASP — ASP.NET Configuration

appsettings.json

{
  "ConnectionStrings": {
    "Default": "Server=.;Database=mydb;Trusted_Connection=True;"
  },
  "Jwt": {
    "Key": "secret-key",
    "Issuer": "MyApp",
    "Audience": "MyApp"
  }
}

Read Configuration

// In Program.cs
var connectionString = builder.Configuration.GetConnectionString("Default");

// In controller
public class MyController : ControllerBase
{
    private readonly IConfiguration _config;
    
    public MyController(IConfiguration config)
    {
        _config = config;
    }
    
    [HttpGet]
    public IActionResult Get()
    {
        var key = _config["Jwt:Key"];
        return Ok(new { Key = key });
    }
}

Environment Variables

{
  "Logging": {
    "LogLevel": {
      "Default": "Information"
    }
  }
}

Multiple Environments

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

Mini Practice

1. Configure appsettings.json
2. Read configuration values
3. Use environment variables
4. Create environment-specific config

Up Next

Continue with ASP.NET Deployment — deployment.