LogRocket's log viewer is designed to replicate the look and feel of the Chrome console, allowing developers to replay console and Redux logs in production web apps for debugging purposes. The implementation involved overcoming challenges such as smooth scroll performance, lazy-loaded object expansion, and persisted state management. The viewer uses libraries like react-virtualized to handle large datasets efficiently by rendering only visible rows, and react-measure to manage dynamic row heights through Redux. Apollo Client is employed for data fetching, ensuring that log entries expand into a loading state while data is fetched, and react-inspector is utilized for object inspection. These tools and techniques collectively create a performant and maintainable log viewer that enhances the debugging experience by providing a familiar interface and functionality to developers.