Convert rAthena TXT DB Files to YAML (.yml) and MySQL (.sql). To convert TXT to pure YML format & file requires PHP 7.1.3+ for Symfony/Yaml. Meanwhile, convert to JSON formatted file with .yml file extension, required PHP 5.2.0+.
"- 08-APR-2005 -- As it turns out, YAML is a superset of the JSON serialization language"
So don't worry, YAML parser can read JSON file, read more about YAML here.
To use YAML converter (optional, you can use JSON), you need composer installed (PHP 7.1.3+ required)
composer install