envdoc is a tool for generating documentation for environment variables in Go structs. It takes comments associated with env tags in Go structs and creates a Markdown, plaintext or HTML file with detailed documentation.

Run it with go run in source file:

//go:generate go run github.com/g4s8/envdoc@latest -output environments.md -type Config
type Config struct {
    // ...
}

Or download binary to run it:

go install github.com/g4s8/envdoc@latest

And use it in code:

//go:generate envdoc -output environments.md
type Config struct {
    // ...
}

//go:generate envdoc -output <output_file_name> -type <target_type_name> 

• -output (required) - Specify the output file name for the generated documentation.
• -type: Specify the target struct type name to generate documentation for. If ommited, the next type after go:generate comment will be used.
• -format (default: markdown) - Set output format type, either markdown, plaintext or html.
• -all - Generate documentation for all types in the file.
• -env-prefix - Environment variable prefix.
• -no-styles - Disable built-int CSS styles for HTML format.
• -field-names - Use field names instead of struct tags for variable names if tags are not set.

Suppose you have the following Go file config.go:

package foo

//go:generate envdoc --output env-doc.md
type Config struct {
  // Port to listen for incoming connections
  Port int `env:"PORT,required"`
  // Address to serve
  Address string `env:"ADDRESS" envDefault:"localhost"`
}

And the go:generate line above creates documentation in env-doc.md file:

# Environment Variables

- `PORT` (**required**) - Port to listen for incoming connections
- `ADDRESS` (default: `localhost`) - Address to serve

See _examples dir for more details.

This tool is compatible with

• full compatibility: caarlos0/env
• partial compatibility: sethvargo/go-envconfig
• partial compatibility: joeshaw/envdecode

Let me know about any new lib to check compatibility.

If you find any issues or have suggestions for improvement, feel free to open an issue or submit a pull request.

This project is licensed under the MIT License - see the LICENSE.md file for details.