Demonstrates how flash-flags integrates with JSON configuration files for flexible application setup.

• JSON configuration support: Load flags from config files
• Configuration hierarchy: Command line overrides config files
• Automatic config discovery: Searches for config files in standard locations
• Config file creation: Dynamic generation of sample configurations
• Mixed sources: Combining CLI arguments with config files

# Run with automatic config file detection go run main.go # Specify a custom config file go run main.go --config myapp.json # Override config values with CLI arguments go run main.go --config myapp.json --host 0.0.0.0 --port 9000 # Show help go run main.go --help

The example uses JSON configuration files:

{ "host": "config.example.com", "port": 9090, "ssl": true, "workers": 4, "log-level": "debug", "timeout": 30.5, "features": ["auth", "metrics", "cache"] }

The application searches for config files in:

• Current directory: ./config.json, ./app.json
• User config: ~/.config/myapp/config.json
• System config: /etc/myapp/config.json

1. Command line arguments (highest priority)
2. Configuration files
3. Default values (lowest priority)

• Graceful handling of missing config files
• JSON parsing error reporting
• Validation after config loading

go build -o config ./config

The example will create a sample demo-config.json file to demonstrate the functionality.

flash-flags • an AGILira library