Chrome Key Event Tester is a free add-on designed for the Chrome browser that assists developers in debugging keyboard-related issues in JavaScript and PNaCl applications. This tool provides a straightforward interface to monitor key events, including keyup, keydown, and keypress, making it easier to identify and troubleshoot problems. The left side of the app displays a summary of these JavaScript events, while the right side presents the corresponding PNaCl events, offering a comprehensive view of keyboard interactions.

Users can hover over key bubbles for additional information and can utilize the 'Debug log' feature to generate a copy/pastable log for bug reporting. This functionality is particularly useful for developers needing to ensure their applications properly handle keyboard inputs. The source code is also available, allowing users to explore further customization or integration options.