Data converters

Excel (XLSX) to JSON Converter

Drop an Excel workbook or CSV and convert any sheet to JSON. Parsing happens locally with JavaScript — the file is never uploaded, which matters when spreadsheets contain people data.

Runs 100% in your browser
No signup · No uploads
Free, unlimited use

Options

Drop or select an .xlsx file (or paste CSV)

⌘/Ctrl + Enter converts · drop a file to load it · processed locally

JSON output

Output is read-only. Use Copy, Download or Share to move it out.

How to use the excel to json tool

Drop your .xlsx file

Drag the workbook onto the input pane, or use the File button. Sheets are parsed in your browser — no upload.
Pick a sheet and header row

Multi-sheet workbooks can be converted one sheet at a time. The first row becomes the header by default.
Copy or download JSON

Export an array of objects, ready for your database, API seed script or further conversion.

What makes this one different

Reads .xlsx workbooks and .csv files with no upload
Sheet selection for multi-sheet workbooks
Header row detection with array-of-arrays fallback
Dates and numbers exported with their real types
Keys sanitised (spaces and odd characters removed) so the JSON is code-friendly

Privacy by architecture: this page contains no analytics that receive your input, and the conversion code runs in your tab. You can disconnect from the network after loading and keep working.

Excel to JSON — frequently asked questions

Is my spreadsheet uploaded to a server?

No. The .xlsx file is parsed by JavaScript in your browser tab using a bundled reader. It never leaves your device, which makes the tool safe for HR, finance and customer data.

Which Excel formats are supported?

.xlsx (Excel 2007 and later) and .csv. The legacy binary .xls format is not supported — open it in Excel and save as .xlsx or .csv first.

How are formulas handled?

Cached values stored by Excel are used. If a file was saved with formulas but without cached results — rare, but possible — those cells may come through empty. Re-saving in Excel refreshes the cache.

What happens to dates?

Excel stores dates as serial numbers; the reader converts them to JavaScript dates and emits ISO strings, so "2025-03-14" arrives as text rather than 45730.

CSV to JSON Convert CSV/TSV exports to JSON arrays or JSON Lines. JSON to CSV Convert JSON arrays into Excel-ready CSV or TSV files. JSON to SQL Generate CREATE TABLE and INSERT statements from JSON data. JSON to JSON Schema Infer a validation-ready JSON Schema from any sample payload.

Searching for “xlsx to json”, “convert excel to json”, “spreadsheet to json”? You are in the right place — browse all 19 tools.

Deeper reading

Blog · 6 min read Excel to JSON: turning workbooks into structured data Convert Excel to JSON in the browser from XLSX workbooks — headers, date serials, formulas and multiple sheets explained, with nothing uploaded. Read the guide →