Why Your JSON-to-Excel Converter Is Silently Corrupting Your Data

Most JSON-to-Excel converters silently corrupt data due to JavaScript's IEEE-754 number limitations and Excel's float64 storage mechanism, creating an invisible blind spot where users ship incorrect financial records and database IDs without detection. Beyond large integers, the risks include loss of leading zeros in account numbers, formula injection vulnerabilities, and undetected timezone shifts—problems that only surface weeks later during data reconciliation.