Building a Browser-Side Document Comparison Tool: Privacy-First .docx Diffing with JavaScript
1、The Problem — Why lawyers overpay for document comparison 2、Architecture — JSZip + LCS paragraph alignment + word-level diff 3、Implementation Details Extracting text from .docx (ZIP → XML → structured paragraphs) Fuzzy paragraph alignment (why LCS isn't enough) Word-level diff rendering (redline format) 4、Performance — 140ms for 20 pages, all client-side 5、Limitations & Next Steps — Formatting changes, tables, PDF
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