Header Normalization Can Create Column Collisions in Order CSV Files

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An order file containing both 'Order ID' and 'order_id' can become ambiguous if header names are trimmed and normalized before lookup construction. When two columns map to the same key, the value used for an order reference may depend on which column overwrote the other. The proposed remedy is to validate the full header set before mapping rows, rejecting ambiguous normalized names outright. The author, of YX Fulfillment, presents a JavaScript example that applies NFKC normalization, trimming, lowercasing, and whitespace-to-underscore replacement, and throws on duplicate keys or missing required fields. The example is described as an independent file-adapter check rather than a production connector.

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