The $extensions Checker is a browser-based tool that parses W3C design tokens files to extract, visualize, and manage $extensions metadata. It helps developers audit what extensions are being used, identify duplicates, clean up bloated token files, and migrate between metadata systems. The tool works entirely locally without sending data anywhere, allowing users to paste their JSON, review all extensions grouped logically, delete unwanted ones individually or in bulk, and export cleaned-up tokens.
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