Convert JSON to Excel Online
Need a quick way to turn a JSON payload into a real .xlsx spreadsheet? JConvert generates properly formatted Excel files right in your browser — complete with auto-sized columns, correct data types, and a clean header row.
Unlike CSV exports that lose formatting when opened in Excel, the .xlsx output produced here is ready to share, filter, and pivot immediately.
No sign-up required. Paste your JSON, convert, and download the Excel file in seconds.
What this converter does
The tool parses your JSON (an array of objects or a single object), flattens nested structures using dot notation, and writes each record as a row in an Excel worksheet. Column widths are automatically adjusted to fit the content, so you get a readable spreadsheet without manual tweaking.
Numbers and booleans are stored as their native Excel types, not as text strings, which means formulas and sorting work as expected.
Common use cases
- Sharing API response data with business analysts who prefer Excel
- Creating reports from JSON log files or database exports
- Generating formatted spreadsheets for client deliverables
- Quick ad-hoc data analysis with pivot tables and charts
- Archiving structured data in a universally readable format
How to use JConvert
- Paste or upload your JSON data on the converter page.
- Select Excel (.xlsx) as the output format if not already selected.
- Click Convert and download the generated spreadsheet file.
Notes and limitations
- The Excel file is generated using the
xlsxlibrary (SheetJS) entirely in your browser. - Nested objects are flattened with dot-notation headers (e.g.
address.street). - Date strings are stored as text; they are not auto-converted to Excel date serial numbers.
- Very large arrays (100k+ rows) may take a few seconds to generate the file.
- Maximum input size is 10 MB.
Privacy and security
The entire conversion runs in your browser. No data is uploaded — the .xlsx file is assembled client-side and downloaded directly. This makes it safe for confidential datasets, internal dashboards, and PII-laden exports.
Example
JSON input
[
{ "product": "Widget A", "price": 9.99, "stock": 142 },
{ "product": "Widget B", "price": 14.50, "stock": 38 }
]Excel output
| product | price | stock |
|-----------|-------|-------|
| Widget A | 9.99 | 142 |
| Widget B | 14.50 | 38 |
(Downloads as a .xlsx file)Ready to convert your data?
Open JSON to Excel ConverterFrequently Asked Questions
- Is the output a real .xlsx file or just a renamed CSV?
- It is a real .xlsx file generated using the SheetJS library. It contains proper cell types, auto-width columns, and is fully compatible with Microsoft Excel, Google Sheets, and LibreOffice Calc.
- Can I convert nested JSON to Excel?
- Yes. Nested objects are flattened into dot-notation columns. For example, {"user":{"email":"[email protected]"}} becomes a column header user.email.
- Does my data leave my browser?
- No. The Excel file is generated entirely client-side. Your data never touches a server.
- What is the maximum file size?
- You can convert JSON files up to 10 MB. For larger files, consider splitting the data into smaller chunks.