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Excel to JSON Converter

Free Excel to JSON converter online: upload an .xlsx or .xls file, pick a sheet, choose whether the first row is headers, then copy or download pretty JSON. Runs fully in your browser with SheetJS — nothing uploaded.

  • Upload .xlsx and legacy .xls workbooks
  • Sheet selector when the file has multiple tabs
  • Header row toggle (objects vs arrays)
  • Pretty JSON with copy and .json download
  • 100% client-side — spreadsheets never upload

Converter

Parsed locally — spreadsheets never upload

Upload an .xlsx or.xls workbook, pick a sheet, and get pretty JSON. Conversion uses SheetJS in your browser.

Have CSV instead?CSV to JSON Converter·CSV Viewer

How to convert Excel to JSON

  1. 01

    Upload the spreadsheet

    Drop or choose a .xlsx or .xls file. Parsing stays in your tab — the file is not uploaded.

  2. 02

    Pick a sheet and header mode

    If the workbook has multiple tabs, select one. Leave “First row is header” on for an array of objects, or turn it off for row arrays.

  3. 03

    Review the JSON

    The pretty-printed output updates when you change sheet or header settings.

  4. 04

    Copy or download

    Copy to the clipboard, or download a .json file named after your workbook.

Why convert Excel to JSON (and when an online tool helps)#

Spreadsheets are great for humans; APIs, fixtures, CMS imports, and front-end mocks usually want JSON. An Excel to JSON converter bridges that gap: you export (or keep) an .xlsx / .xls workbook, turn each data row into an object or array, and paste the result into a script, Postman body, or config file. Searches like excel to json converter online free and xlsx to json online usually mean the same job — get structured JSON without installing desktop ETL software.

This page is a xlsx to json converter that runs in the browser with SheetJS. That matters for privacy and speed: workbook bytes never leave your device for conversion, and you can iterate on sheet choice and header settings instantly. Prefer it for one-off exports, handoff to developers, and small-to-medium sheets. Huge enterprise workbooks with macros or external links may still belong in a pipeline — but everyday “convert this export to JSON” tasks fit here.

How this Excel to JSON converter online works#

After you drop a file, the tool loads SheetJS (xlsx) from a public CDN, reads the workbook in memory, and lists sheet names. With First row is header enabled (default), the first row becomes object keys and each following row becomes one object — the shape most APIs expect. Turn the toggle off to get an array of arrays (useful when there is no header row or you want raw cell grids). Blank cells become empty strings so keys stay consistent across rows.

Multi-sheet workbooks are common in Excel exports (Summary + Detail, Regions, months). The sheet selector switches which tab is converted without re-uploading. Output is always pretty-printed JSON (2-space indent) so you can skim keys before you copy or download. That covers convert xlsx to json online intent without forcing a minified blob you cannot audit.

Header rows, types, and Excel quirks#

Header quality drives JSON quality. Duplicate or empty header cells are normalized (Column_N, name_2) so every key is usable in JavaScript. Dates and numbers follow SheetJS’s cell parsing — you may see Excel serial dates as numbers unless the cell was stored as text. Formulas contribute their calculated values when present in the file; this tool does not re-run Excel’s calculation engine.

Merged cells, charts, pivot caches, and VBA are out of scope. If you need a flat table view of CSV instead, use the [CSV Viewer](/tools/csv-viewer). If your source is already CSV text (or you want JSON → CSV as well), use the [CSV to JSON Converter](/tools/csv-to-json-converter). Export the sheet to CSV from Excel when you only need a single rectangular table and want a lighter format.

Privacy: local conversion for business spreadsheets#

Payroll, CRM dumps, and inventory sheets often contain PII. Many “free converters” upload the file to a remote worker. This excel to json converter free workspace keeps parsing local: only the SheetJS library is fetched from the CDN; your workbook stays in memory in the page. Prefer that model whenever you would not paste the same file into an untrusted upload form.

If conversion fails, typical causes are a non-Excel file renamed with the wrong extension, a password-protected workbook, a truncated download, or a browser that blocked the CDN script. Re-export from Excel/Google Sheets (Download as .xlsx), try another sheet, or refresh after allowing cdnjs/jsDelivr.

SEO checklist for spreadsheet → JSON workflows#

1. Keep one canonical export — convert from a named sheet, not ad-hoc copy/paste, so API fixtures stay reproducible.

2. Stable header names — use slug-like column titles (sku, meta_title) so JSON keys match schema fields.

3. Validate after convert — run the output through a [JSON formatter / validator](/tools/json-formatter-validator) before shipping.

4. Prefer UTF-8 — avoid encoding surprises when product names or locales leave Excel.

5. Document the sheet — note which tab and header mode produced the JSON in your commit message or README.

6. Do not upload secrets — strip API keys and personal columns before sharing JSON publicly.

7. Link related formats — CSV pipelines → [CSV to JSON](/tools/csv-to-json-converter); tabular review → [CSV Viewer](/tools/csv-viewer).

Frequently asked questions

Is this Excel to JSON converter free and online?

Yes. It is a free Excel to JSON converter online — no account and no paywall for conversion. Processing runs in your browser; you copy or download the JSON when it is ready.

Does it support both .xlsx and .xls?

Yes. Modern Office Open XML (`.xlsx`) and legacy BIFF (`.xls`) workbooks are supported via SheetJS. Password-protected files are not supported.

Are my spreadsheets uploaded to a server?

No. The workbook is read in your tab and converted locally. Only the conversion library is loaded from a CDN; your data is not sent to DevSEOCraft for processing.

What does the header row toggle do?

When enabled (default), the first row becomes object keys and later rows become objects. When disabled, you get an array of arrays — one array per row, including the first.

How do I convert a specific sheet in a multi-tab workbook?

After upload, use the sheet selector to pick the tab. JSON regenerates for that sheet without re-uploading the file.

Can I download the result as a .json file?

Yes. Use Download JSON to save a pretty-printed file named after your workbook (extension changed to .json). You can also copy the output to the clipboard.

I have CSV instead of Excel — what should I use?

Use the CSV to JSON Converter for paste/upload of CSV text (and JSON → CSV). Use the CSV Viewer if you mainly need a table preview. This page is for native .xlsx / .xls files.

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