Does the downloaded file only contain the first 5 rows shown in the preview?

No. The preview is capped at five rows purely to keep the table on screen readable; the actual download processes and includes every row in your JSON array, however many there are.

My JSON is valid but the download still fails. What does that mean?

That's a separate failure from a JSON syntax error, it means the worker itself hit a problem while building the spreadsheet from otherwise-valid data. The tool keeps the two apart deliberately, so a real syntax mistake in your input isn't confused with a generation problem on a file that was actually fine.

Why does the preview only show columns from the first object in my array, even when a later object has an extra key?

The preview derives its column headers only from the first item in your array, purely so the table has something to render quickly. If your data has inconsistent keys across objects, check the downloaded file directly rather than relying on the five-row preview to catch every column.

JSON to Excel Converter: Download .xlsx from JSON Free

JSON Inputpaste or type · or drop a .json file

Browse

Preview

First 5 rows

Preview will appear here…

Generated in an isolated Web Worker: no data is uploaded to servers

From JSON array to a real Excel file

Sending a JSON array to a non-technical stakeholder means they need to run code to read it. Converting to Excel gives them a file they can open directly, filter with AutoFilter, and share without any setup.

This tool generates a proper .xlsx binary, not a renamed CSV, with correct column headers and cell types.

What the preview tells you

Before downloading, the live preview shows the first five rows of the Excel sheet so you can confirm that keys became column headers and values landed in the right cells.

If your JSON contains nested objects, flatten them first. Nested values otherwise serialize as JSON strings in the cell, which is usually not what you want in a spreadsheet.

Reporting and handoff use cases

Backend developers export JSON API responses to Excel for product review meetings. Support teams convert JSON log data to spreadsheets for ticket analysis.

Data analysts receive JSON from a data warehouse and convert it to Excel for pivot table work. The generated file downloads instantly, with no server round-trip and no file size limit imposed by an upload endpoint.

Frequently asked questions

The preview runs a quick parse directly in the page just to render up to five rows. Generating the real .xlsx binary happens in a separate Web Worker and only runs when you click Download, since building a full spreadsheet file on every keystroke would be wasted work almost every time.

JSON → Excel

From JSON array to a real Excel file

What the preview tells you

Reporting and handoff use cases

Frequently asked questions