JSON Formatter, a popular open source Chrome extension for viewing and exploring JSON API responses, has been archived. The developer is moving to a closed-source commercial model to build a more comprehensive API-browsing tool. The final open source version is published as 'JSON Formatter Classic' on the Chrome Web Store for users who prefer a simple, local-only, no-update extension. The repo remains available for forking. The extension features syntax highlighting, collapsible trees, dark mode, clickable URLs, and fast performance even on large JSON pages.
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