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Node.js CSV diff toolkit rejects duplicate IDs before comparing records

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A lightweight Node.js toolkit (csv-toolkit v0.2.0) has been released to compare CSV snapshots by matching records on named key columns rather than row position or column order. The tool deliberately halts any comparison when it detects duplicate or blank key values, preventing ambiguous record pairing. Running the included demo generates nine output files — including HTML audit and change reports — showing added, removed, changed, and unchanged records across two snapshots. An audit function also flags data quality issues such as missing fields or invalid numeric values without modifying the source files. The toolkit has no third-party dependencies and requires Node.js 22 or later to run.

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Node.js CSV diff toolkit rejects duplicate IDs before comparing records · ShortSingh