JSON to Excel Converter
Handle Million Rows in Your Browser

Convert JSON files to Excel (XLSX) format instantly in your browser. Paste JSON text directly or upload a .json file. Powered by DuckDB-WASM, dates and numbers are preserved as native Excel types.

Drag & drop your file here, or browse

Accepts: .json (up to 200 MB)

Max 10 million cells (rows × columns)

Your data stays in your browser. By using this tool, you agree to our Terms and Privacy Policy.

How to Convert JSON to Excel

Choose the "Upload File" tab and drag & drop your .json file, or switch to the "Paste Text" tab and paste your JSON data directly.

The tool reads your JSON using DuckDB-WASM. Supported formats: Array of objects ([{...}, {...}]) and NDJSON (one object per line).

Preview the output with column headers, data types, and row data.

Click the download button to save the Excel (.xlsx) file.

Features

100% Browser-Based: Your data never leaves your device. All conversion happens locally using WebAssembly — no server upload, no privacy concerns.
Paste or Upload: Paste JSON directly into the text area or upload a .json file. Perfect for quick tests or batch conversions.
Native Excel Types: Dates, timestamps, numbers, and booleans are detected and converted to proper Excel cell types, so formulas and sorting work correctly.

JSON vs Excel (XLSX): What's the Difference?

JSON (JavaScript Object Notation) is a lightweight text-based format ideal for APIs and applications. Excel (XLSX) is a rich binary format with typed cells, formatting, formulas, and multiple sheets — the standard tool for business data.

	JSON	Excel (XLSX)
Structure	Key-value pairs (nestable)	Multiple sheets, rich formatting
Data types	Strings, numbers, booleans, null	Numbers, dates, booleans, text
Formatting	None	Cell styles, colors, borders
Formulas	Not supported	Full formula support
Common use	Web APIs, config files, NoSQL	Business reports, Excel workflows

Benefits of Converting JSON to Excel

Open directly in Excel with correct data types — dates and numbers just work
Easy to share with business teams — Excel is the universal business tool
Start using formulas, sorting, and filtering immediately

Frequently Asked Questions

Is my data uploaded to a server?

No. Your file never leaves your browser. All processing happens locally using WebAssembly. No data is sent to any server.

Is it free?

Yes, this tool is completely free with no row limits.

What JSON structures are supported?

This tool supports JSON arrays of objects (e.g., [{"id": 1}, {"id": 2}]) and NDJSON (newline-delimited JSON). Each object becomes a row, and keys become column headers. Nested objects and arrays are converted to text in Excel cells.

Can I convert a large JSON file with millions of rows to Excel?

Yes, up to Excel's maximum of 1,048,576 rows. This tool uses DuckDB-WASM for fast in-browser processing.

Can I paste JSON directly instead of uploading a file?

Yes. Switch to the "Paste Text" tab and paste your JSON data directly. The tool validates and converts it instantly. For pasted text, the limit is 10MB — use file upload for larger data.

Are dates and numbers preserved as Excel types?

Yes. The converter detects date, timestamp, numeric, and boolean columns from your JSON and creates properly typed Excel cells, so formulas and sorting work correctly.

What is the file size limit?

The input limit is 200MB. Excel has a maximum of 1,048,576 rows per sheet. Since XLSX generation builds the entire workbook in memory, we limit input size to prevent browser memory issues.

What if my JSON has more than 1 million rows?

Excel supports a maximum of 1,048,576 rows per sheet. If your JSON exceeds this limit, the tool will show an error. For larger datasets, use JSON to Parquet for efficient columnar storage.

Can I clean up or filter data before converting?

This page is a dedicated conversion tool. For data cleansing before conversion, try LeapRows — no sign-up required.

What browsers are supported?

Any modern browser with WebAssembly support: Chrome, Firefox, Edge, Safari (14+).