Paste a list of objects — an API response, an export, a log — and get a workbook. The columns are the union of every key, so a record missing a field leaves a blank rather than shifting everything along.
The spreadsheet writer is a few kilobytes of our own code — no million-byte library is downloaded. Your file is read on your own machine and never sent anywhere — open your browser's network tab and watch while you use it.
A list of objects. A single object works too and becomes one row.
They are written into the cell as JSON text, so nothing is silently thrown away.
Everything here is free and works the same way — in your browser.