If you're wanting to test your JavaScript skills this is the challenge for you. Use whichever JS framework you prefer and pull data from the REST Countries API.
frontendmentorio/rest-countries-api-with-color-theme-switcher
Instructions file CodexOpenCode
AGENTS.md instructions for frontendmentorio/rest-countries-api-with-color-theme-switcher, covering 1. role definition, 2. core principles, never do, always do and 3. teaching style.
frontendmentorio/rest-countries-api-with-color-theme-switcher
Instructions file
Claude Code instructions for frontendmentorio/rest-countries-api-with-color-theme-switcher: This project uses AGENTS.md as the source of truth for AI assistant behavior.