Question 1

How does konf compare to viper for Go configuration?

Accepted Answer

konf is designed for higher performance and better decoupling, with benchmarks showing faster unmarshaling. However, viper has a larger ecosystem and more community plugins, making it more battle-tested for diverse use cases. konf excels in cloud-native scenarios with built-in dynamic updates.

Question 2

Can konf load configuration from YAML files?

Accepted Answer

Yes, konf supports YAML files through the file or fs providers, as it uses Go's standard io/fs interface. You can load embedded or local YAML files similarly to JSON, but ensure the file content is parseable by your application.

Question 3

How to set up AWS S3 configuration watching with konf?

Accepted Answer

Use the s3 provider loader to load from S3 and pair it with the sns notifier for change notifications. Register the loader with the notifier and start it in a goroutine, as shown in the README example, to enable real-time updates without polling.

Question 4

Does konf support hot reloading of config files?

Accepted Answer

Yes, via the file provider's watch functionality and OnChange callbacks. When a file changes, konf can automatically reload and trigger registered callbacks, allowing hot reloading without restarting the Go application.

Question 5

What are the dependencies for konf cloud providers?

Accepted Answer

Cloud providers like appconfig or secretmanager add external SDK dependencies (e.g., AWS SDK for Go). The core module remains zero-dependency, but using cloud features requires importing additional packages, which increases binary size and complexity.

Question 6

How to create a custom configuration provider in konf?

Accepted Answer

Implement the Loader interface for static sources or both Loader and Watcher for dynamic sources. Follow the examples in the providers directory, such as fs or appconfig, to define how configuration is loaded and watched, then integrate it with konf.Config.

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