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appsettings.json to .env Converter

v1.0.0

appsettings.json to .env Converter

Convert ASP.NET Core appsettings.json files to .env environment variable format. Supports Development and Production presets. Fully client-side.

Warning

This tool is not supported on mobile devices, please use a desktop device for better experience.

Your data never leaves your browser. All conversion is done locally — nothing is uploaded to any server.
Options

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  • Convert JSON data to YAML format for readable configuration and documentation.

  • Convert Markdown files to PDF format for easy sharing and printing.

  • Convert JSON data into Rust structs for easy integration with your codebase.

  • Convert JSON data into JavaScript object declarations with customizable variable names and export options.

  • Convert JSON data into CSV format for easier data analysis and sharing.

  • Convert CSV files to JSON format for easier data manipulation and integration.

  • Convert SVG markup to PNG, JPEG, or WebP images directly in your browser with custom resolution and background.

  • Convert YAML configuration files to JSON format for easier processing and integration.

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What is the appsettings.json to .env Converter?

The appsettings.json to .env Converter transforms ASP.NET Core configuration files into environment variable format (.env), making it easy to move settings between local development, Docker, and cloud deployments.

Why Convert appsettings.json to .env?

  • Docker & containers: Container environments prefer flat environment variables over JSON files.
  • 12-factor apps: The 12-factor methodology recommends storing config in environment variables for portability and security.
  • CI/CD pipelines: Most CI/CD platforms (GitHub Actions, GitLab, Azure DevOps) inject config as environment variables, not files.
  • Cloud hosting: Platforms like Azure App Service, Heroku, and Railway accept environment variables directly.

How ASP.NET Core Reads Environment Variables

ASP.NET Core's configuration system maps nested JSON keys to environment variables using double underscore (__) as a separator. For example:

  • ConnectionStrings:DefaultConnection → ConnectionStrings__DefaultConnection
  • Jwt:Secret → Jwt__Secret
  • Logging:LogLevel:Default → Logging__LogLevel__Default

This tool automatically applies that mapping so your converted variables work directly with ASP.NET Core's environment variable configuration provider.

File Type Presets

  • appsettings.json: Base configuration shared across all environments.
  • appsettings.Development.json: Overrides for local development (verbose logging, local DB connections).
  • appsettings.Production.json: Overrides for production (restricted logging, production secrets).

Features

  • Supports deeply nested JSON — flattened automatically with __ separator
  • Choose between double underscore, colon, or single underscore key separators
  • Values with spaces or special characters are automatically quoted
  • Load presets for Development or Production appsettings files
  • Copy the result to clipboard in one click
  • Fully client-side — your secrets never leave your browser

How to Use

  1. Select the file type (base, Development, or Production) from the settings panel, or paste your own JSON directly.
  2. Choose your preferred key separator (double underscore is the ASP.NET Core default).
  3. Click Convert or switch to the .env tab to see the result.
  4. Copy the output and paste it into your .env file or CI/CD pipeline secrets.
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