This file is primarily used by Visual Studio to configure how your ASP.NET Core application launches during development. It contains settings for different profiles (e.g., IIS Express, ProjectName) and provides a convenient way to set environment variables without modifying your system’s global environment variables.
Location You’ll find launchSettings.json in the Properties folder within your project’s root directory.
Structure { “iisSettings”: { … }, // Settings for IIS Express (if used) “profiles”: { “IIS Express”: { … }, // Configuration for IIS Express profile “YourProjectName”: { // Configuration for running the project directly “commandName”: “Project”, “dotnetRunMessages”: “true”, “launchBrowser”: true, “applicationUrl”: “https://localhost:7272;http://localhost:5248”, // URLs to launch “environmentVariables”: { “ASPNETCORE_ENVIRONMENT”: “Development” // Setting the environment } } } }
Setting the ASPNETCORE_ENVIRONMENT Variable Within the environmentVariables section of the desired profile (e.g., “YourProjectName”), you can set the ASPNETCORE_ENVIRONMENT variable to one of the standard values: Development: For local development and debugging. Staging: For pre-production testing. Production: For the live environment. You can also use a custom environment name if needed.
Example: Setting the Development Environment “environmentVariables”: { “ASPNETCORE_ENVIRONMENT”: “Development” }
Important Considerations Environment-Specific Configuration Files: Remember that you’ll still need to create environment-specific configuration files (e.g., appsettings.Development.json) to store settings that vary between environments. launchSettings.json only sets the environment variable. Local Development: The launchSettings.json file is primarily for local development with Visual Studio. When you deploy your application to a server, you’ll typically set the ASPNETCORE_ENVIRONMENT variable through the hosting environment’s configuration (e.g., in the web server’s configuration file or environment variables). Multiple Profiles: launchSettings.json can contain multiple profiles, each with its own set of environment variables. This allows you to easily switch between different configurations during development.
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ASP.NET Core Environments