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The LZ4 Compression Playground is a web application designed to facilitate the compression and decompression of files using the LZ4 algorithm directly in the browser. It's built as a companion playground for the open source package `@nick/lz4`, which is distributed via JSR at https://jsr.io/@nick/lz4. The playground provides users with a user-friendly interface to upload files or input text to compress or decompress, while also displaying performance metrics and historical data for previous operations. To use the app, users can either drag and drop files into the designated area or select files from their device. The application supports both text input and file uploads, allowing users to switch between modes for compression and decompression. Users can also select sample data for testing purposes. Once the input is provided, users can initiate the compression or decompression process, after which the results are displayed, including the output data and performance metrics such as processing time, compression ratio, and throughput. The app is privacy-friendly, and operates 100% client-side without sending any of the user's data outside of the confines of their browser. The app is built using modern web technologies, including TypeScript, React, and various libraries for UI components and data visualization. It utilizes the `@nick/lz4` package's compression library, loaded from JSR (the JavaScript Registry), allowing the user to select a specific version of the package to perform the compression or decompression with. Data persistence is handled via the Web Storage API (localStorage), allowing the app to save user preferences and compression history without the need for an external service. The application also features light/dark modes, with a retina-friendly dark mode enabled by default. Key features of the LZ4 Compression Playground include: - File and text input options for compression and decompression. - Performance metrics display, including original and result sizes, compression ratios, and processing speed. - Compression history tracking with the ability to clear or delete entries. - Sample data selection for quick testing. - Shareable links for sharing compression results, with considerations for data size limitations. - A responsive design that adapts to different screen sizes and devices. Overall, the LZ4 Compression Playground serves as a comprehensive tool for users looking to experiment with data compression in a secure, client-side environment, ensuring that their data remains private and is processed entirely within their browser.