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ISBNNeedle CLI Tool Catches Duplicate ISBNs Before Catalog Imports

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A developer has released ISBNNeedle, a lightweight Node.js command-line tool designed to preflight mixed ISBN-10 and ISBN-13 lists before catalog imports or inventory merges. The tool validates check digits, normalizes identifiers, and flags duplicate editions represented in different ISBN forms that could otherwise cause inventory splits or metadata conflicts. It converts ISBN-10 to 978-prefix ISBN-13 equivalents and vice versa, while correctly noting that 979-prefix ISBN-13 identifiers have no ISBN-10 counterpart. ISBNNeedle operates entirely offline with no network lookups, telemetry, or external dependencies, and restricts input to prevent abuse. Version 0.1.0 includes 14 tests verified across Node.js versions 20, 22, and 24, with JSON output support for CI pipeline integration.

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ISBNNeedle CLI Tool Catches Duplicate ISBNs Before Catalog Imports · ShortSingh