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Developer Builds Browser-Based Hash Calculator Using Web Crypto API and Vanilla JS

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A developer built a client-side file integrity tool after a silent file-upload failure revealed corruption during transfer, with no trusted hash utility on hand. The tool leverages the browser's native Web Crypto API for SHA-256, SHA-384, and SHA-512, while a custom vanilla JavaScript implementation covers MD5, which the API deliberately excludes due to security concerns. To handle large files without crashing the browser, the tool reads data in 1MB chunks rather than loading entire files into memory at once. A debounce mechanism and case-insensitive hash comparison feature were added to improve usability and prevent performance issues during rapid input. The project was built with AI assistance, though the developer notes that human review remained essential to catch algorithmic errors the AI introduced.

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