Built-in plugins handle common configuration formats:

• YAML - Complex nested structures
• JSON - Modern API configs
• SQLite - Database-driven settings
• Your format here! - Add a plugin

• Plugin-based architecture for unlimited format support
• Smart key flattening for nested structures
• Preserves array indices
• Type-safe conversions
• Clean .env output

# Install
go install github.com/handaber/cfg2env@latest

# Use with any supported format
cat config.yaml | cfg2env > .env
cat config.json | cfg2env --format json > .env
cat config.db | cfg2env --format sqlite > .env

database:
  host: localhost
  port: 5432
  credentials:
    username: admin
    password: secret
api:
  features:
    - logging
    - metrics

{
  "database": {
    "host": "localhost",
    "port": 5432,
    "credentials": {
      "username": "admin",
      "password": "secret"
    }
  },
  "api": {
    "features": ["logging", "metrics"]
  }
}

CREATE TABLE config (
  key TEXT PRIMARY KEY,
  value TEXT
);

INSERT INTO config (key, value) VALUES
  ('database_host', 'localhost'),
  ('database_port', '5432');

-- Custom queries supported:
-- cfg2env --format sqlite --query "SELECT name as key, value FROM settings"

API_FEATURES_0=logging
API_FEATURES_1=metrics
DATABASE_CREDENTIALS_PASSWORD=secret
DATABASE_CREDENTIALS_USERNAME=admin
DATABASE_HOST=localhost
DATABASE_PORT=5432

make build  # Build the core and plugins
make test   # Run the test suite

The plugin system makes it easy to add support for new formats:

package myplugin

type Plugin struct {
    plugin.BasePlugin
}

func (p *Plugin) Parse(r io.Reader) (map[string]string, error) {
    // 1. Read your format
    // 2. Convert to key-value pairs
    // 3. Return the mapping
    return map[string]string{}, nil
}