yargs-parser is a command-line argument parser that powers the popular 'yargs' package. It focuses on parsing strings into JavaScript objects, making it easy to access arguments passed to your Node.js scripts. It handles options, flags, and positional arguments with flexibility. You can define aliases, boolean flags, and default values. Its key features include support for numbers, arrays, key-value pairs, and a clean API for seamless integration into your projects. It is well-tested and used in countless popular libraries.