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I built a browser-based CSV comparison tool for large data exports

Comparing two CSV exports sounds simple until you're dealing with thousands of rows and need to figure out what actually changed.

I built CSVCompare to solve exactly that.

You drop in the before and after CSV files, and it automatically detects the best key and separates the differences into:

  • Modified
  • Added
  • Removed
  • Unchanged

Everything runs entirely in the browser. The CSV files aren't uploaded to a server.

I also wanted it to remain useful for larger exports rather than forcing everything into a spreadsheet and manually comparing rows.

Try it here:
https://csvcompare.pages.dev

This is a small independent experiment, and I'm mainly interested in whether this solves a problem other developers actually have. Feedback is welcome.

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