CodeViewer is a Chrome extension developed by Xiaoxing Liang. It is a tool designed to enhance the readability of code structures on web pages. The extension currently supports parsing code on GitHub and GitLab, allowing users to quickly understand the code structure and navigate to specific functions, variables, and more.

One of the main features of CodeViewer is the ability to generate a code navigator directly in the Chrome browser. This allows users to easily navigate through the code and find the relevant sections they need. The extension also organizes imports, variables, classes, and functions into groups, making it even easier to understand the code structure.

Another useful feature of CodeViewer is the ability to save parsed results in the browser's local storage. This allows users to revisit the parsed code later without having to re-parse it. This can be especially helpful when working on large codebases or when needing to reference specific sections of code.

CodeViewer supports a wide range of programming languages including C++, C#, Go, Java, JavaScript, Python3, Rust, Scala, and Kotlin. This makes it a versatile tool for developers working with different languages.

Overall, CodeViewer is a valuable Chrome extension for developers who want to improve their code reading experience. Its parsing and navigation features, along with support for multiple programming languages, make it a useful tool for understanding code structures on GitHub and GitLab.