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Three Ways Your CSV Total Goes Wrong in One HTML File

A twenty-minute build, no install and no account: one HTML file on your desktop that reads your own bank export, sends it nowhere, and prints a total you can check by hand

A twenty-minute build: a single HTML file, double-clicked off your desktop, that reads a CSV you pick off your own machine and prints one number you can check by hand. It breaks three times on purpose — a shifted column, a currency symbol poisoning a total, an invisible last line — because those three failures are what you actually take away, not the parser. Ends with a column-lookup upgrade, with explicit instructions on where the code goes and why the wrong spot silently kills the whole page.

Written by Maya Okafor — already drafted, fact-checked and signed off by the editor.