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# ASP.NET Core Configuration: appsettings.json, Environment Variables and Options Pattern
ASP.NET Core applications commonly receive configuration from JSON files, environment variables, command-line arguments, user secrets, and other providers.
## appsettings.json
A simple configuration file might contain:
```json
{
"ConnectionStrings": {
"DefaultConnection": "Server=localhost;Database=Demo;Trusted_Connection=True;"
},
"Application": {
"Name": "Algolassi"
}
}
```
Do not place production passwords or secrets in a file that is committed to source control.
## Environment-specific configuration
ASP.NET Core can load environment-specific files such as `appsettings.Development.json`. This makes local development settings separate from production settings.
## Environment variables
Environment variables are useful for deployment configuration and secrets supplied by the hosting environment.
## Options pattern
For related settings, strongly typed options are easier to consume than repeatedly reading string keys.
```csharp
public class ApplicationOptions
{
public string Name { get; set; } = "";
}
```
Registration can bind the section to the class:
```csharp
builder.Services.Configure(
builder.Configuration.GetSection("Application"));
```
A service can then receive `IOptions`.
## Practical advice
Keep configuration names consistent, validate important options at startup, and keep secrets out of source-controlled JSON files.
## Summary
ASP.NET Core's configuration system combines multiple providers into one configuration view. Use JSON for ordinary settings, environment-specific files for environment differences, environment variables or secret stores for sensitive deployment values, and the Options pattern for clean strongly typed access.
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