Excel to JSON Converter Online

Web APIs don't understand .xlsx files; they speak JSON. If a client hands you a spreadsheet with 500 rows of user data and asks you to seed a database, manually typing out those JSON objects would take days. This parser lets you literally copy-paste Excel cells directly into the browser and instantly generate a perfectly formatted JSON array.

The TSV Clipboard Trick

When you highlight cells in Microsoft Excel or Google Sheets and press Ctrl+C, the OS clipboard doesn't actually copy "spreadsheet data". It copies plain text, separating columns with a hidden Tab character (\t) and rows with a Newline ( ). This tool leverages that OS-level behavior. It intercepts the tab-separated values (TSV) from your clipboard, splits the text block by newlines, and loops through the matrix.

Key Generation

The algorithm always assumes the very first row contains your headers. It extracts those header strings to create the JSON keys (e.g., "firstName"). It then maps every subsequent row to those exact keys. If your spreadsheet lacks a header row, the JSON will use your first row of actual data as the keys, which will break your structure.

String Types Only

Because the clipboard transfers plain text, the parser cannot know if a cell containing 25 is meant to be a mathematical integer or a string. By default, all generated JSON values are wrapped in quotes as strings ("25"). You will need to parse them on your backend if your database requires strict integers.