Appsettings.json
appsettings.json is a conventional JSON configuration file used by .NET applications to store application settings.
Building Web APIs with ASP.NET Core
appsettings.json is a .NET application configuration file that stores settings as JSON key-value pairs shared across runtime environments unless overridden.
- How it is used
- Stores shared ASP.NET Core web API settings that environment-specific files can override.
- How deep it goes
- Explains JSON settings, override order, and a Program.cs boolean read; defers production-server environment setup.
- Examples
- Uses a developer exception page toggle, a thrown-error test endpoint, and staging and development Swagger settings.
- What you can do after
- Operate/configure it to set shared defaults and environment overrides, then verify an exception response through a test endpoint.
Read how Building Web APIs with ASP.NET Core explains appsettings.json →
.NET in Action, Second Edition
appsettings.json is a conventional .NET application configuration file containing default JSON settings.
- How it is used
- Provides default application settings that deployment-specific files and later configuration sources can replace.
- How deep it goes
- Explains file loading and override order, demonstrates IConfiguration access, and stops short of detailed configuration binding.
- Examples
- Uses Development settings, EnvironmentName and RegionName keys, a ConfigController, and TestOverwrite override experiments.
- What you can do after
- Operate/configure ASP.NET Core applications by defining defaults, selecting environment files, and verifying overrides through IConfiguration.
Read how .NET in Action, Second Edition explains appsettings.json →
Pro ASP.NET Core 7, Tenth Edition
appsettings.json is a conventional JSON file that stores application configuration settings for an ASP.NET Core application.
- How it is used
- Configures ASP.NET Core applications with logging, host restrictions, database connections, and environment-specific settings.
- How deep it goes
- Explains JSON structure, hierarchical processing, source merging, and environment overrides, but defers detailed configuration usage to consuming services.
- Examples
- Uses LocalDB connection strings for SportsStore, People, and Identity databases alongside logging and AllowedHosts settings.
- What you can do after
- Operate/configure ASP.NET Core applications with named connection strings and environment-specific logging settings.
Read how Pro ASP.NET Core 7, Tenth Edition explains appsettings.json →
ASP.NET Core in Action, 3e
appsettings.json is a conventional ASP.NET Core configuration file containing application settings in JSON format.
- How it is used
- Supplies runtime settings for ASP.NET Core applications through a conventional JSON configuration file.
- How deep it goes
- Explains default and custom nested settings, provider behavior, key casing, and security limits without detailing binding implementation.
- Examples
- Uses template logging settings, AllowedHosts, MapSettings, DefaultLocation, and appsettings.Production.json.
- What you can do after
- Operate/configure ASP.NET Core behavior with organized JSON settings and environment-specific files.
Read how ASP.NET Core in Action, 3e explains appsettings.json →
Related concepts
- appsettings.Development.jsonconfigured by · appsettings.Development.json is an ASP.NET Core environment-specific JSON configuration file whose settings apply when the Development environment is active.
- JSONuses · JSON is a standardized, language-independent text format for representing structured data using objects, arrays, strings, numbers, Boolean values, and null.
- connection stringconfigures · A connection string is a structured configuration value specifying how a client connects to a data source or service, including its location and connection parameters.
- logging serviceconfigures · A logging service is a system that receives, processes, aggregates, indexes, transports, or stores log records from applications or other systems.
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