How to Use koanf as a Viper Alternative

Replace Viper with Koanf by initializing a Koanf instance, adding a file source, and reading values directly into your struct or map.

import (
	"github.com/knadh/koanf/parsers/yaml"
	"github.com/knadh/koanf/providers/file"
	"github.com/knadh/koanf/v2"
)

k := koanf.New(".")
if err := k.Load(file.Provider("config.yaml"), yaml.Parser(), nil); err != nil {
	panic(err)
}
port := k.Int("server.port")

1. Install the Koanf library and its YAML parser provider. go get github.com/knadh/koanf/v2 github.com/knadh/koanf/parsers/yaml
2. Create a new Koanf instance with a custom delimiter. k := koanf.New(".")
3. Load your configuration file using the file provider and YAML parser. k.Load(file.Provider("config.yaml"), yaml.Parser(), nil)
4. Retrieve configuration values using the dot-delimited key path. port := k.Int("server.port")

Koanf is a lightweight configuration library that replaces Viper by loading settings from files, environment variables, or command-line flags into your Go app. It works like a universal translator that reads different file formats and gives you the data you need without the extra complexity. You use it when you want a simpler, more modular way to manage your application settings compared to Viper's larger ecosystem.