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JSON Toolbox- Free online JSON tools

Excel to JSON

Convert an Excel (.xlsx / .xls) spreadsheet to a JSON array online. The header row becomes keys — all in your browser.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded

Upload an Excel file (.xlsx or .xls) to convert it to JSON. Everything is parsed in your browser — the file is never uploaded.

JSON output

Empty

How it works

About this tool

This Excel to JSON importer reads an .xlsx or .xls file and converts each sheet into a JSON array of objects. The first row of a sheet is used as the keys and every following row becomes an object.

Choose a file and it is parsed instantly in your browser. When the workbook has one sheet you get a plain array; when it has several, you get an object keyed by sheet name so nothing is lost.

Common uses include turning finance or ops spreadsheets into API-ready JSON, fixtures for tests, or payloads for scripts.

The file is read locally using an in-browser spreadsheet engine and is never uploaded, which makes it safe for confidential reports and internal data.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I convert Excel to JSON?
Select an .xlsx or .xls file. The sheet (or sheets) are parsed into JSON immediately — copy the result or download it as a .json file.
Which spreadsheet formats are supported?
Modern Excel workbooks (.xlsx) and legacy files (.xls). The first row of each sheet is treated as the column headers.
What happens with multiple sheets?
A single-sheet workbook becomes a JSON array. A multi-sheet workbook becomes an object whose keys are the sheet names and whose values are the row arrays.
Is my spreadsheet uploaded anywhere?
No. The file is parsed entirely in your browser and never sent to a server, so it is safe for sensitive spreadsheets.

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