JSON Viewer is a free Chrome extension designed for displaying JSON and JSONP data with enhanced readability. It features syntax highlighting, collapsible nodes, and 27 built-in themes that allow users to customize their viewing experience. Users can easily inspect JSON content through the console or by using the omnibox command, making it a versatile tool for developers and data analysts alike.

In addition to its core features, JSON Viewer offers options for viewing raw or highlighted data, displaying line numbers, and editing loaded JSON. It supports large numbers and provides a scratch pad for continuous formatting. The extension also includes sorting capabilities by keys and customizable tab sizes, ensuring a tailored experience for each user. Note that users may need to enable certain options manually, especially when working with local files or incognito tabs.