@discoveryjs/json-ext extends JavaScript's built-in JSON object with enhanced functionality for handling complex data structures common in data visualization and analysis. It provides methods for serializing and deserializing JavaScript objects, arrays, and other data types to JSON format, addressing limitations in standard JSON regarding circular references, dates, and undefined values. This library ensures robust and reliable JSON handling, particularly beneficial when working with data-heavy applications or needing reliable data exchange with systems that rely on JSON.