Convert JSON to CSV Online Free

Got JSON data you want in a spreadsheet? AllConvert converts JSON to CSV instantly, right in your browser — ready to open in Excel or Google Sheets. No upload, no account.

Why convert JSON to CSV?

JSON is how APIs and apps exchange data, but it is painful to read in bulk and impossible to filter, sort or chart without writing code. CSV opens directly in Excel, Google Sheets and Numbers, turning an API export into something anyone on the team can analyze. It is the fastest path from a developer-shaped file to a business-shaped spreadsheet.

What JSON shape works?

The converter expects an array of flat objects — the most common shape for API responses and database exports. Each object becomes a row, and the union of keys becomes the header row. Deeply nested structures should be flattened before converting; if a value is itself an object or array, it is serialized into its cell as text.

From CSV back to JSON or Excel

AllConvert covers the reverse trip too: CSV to JSON for getting spreadsheet data back into code, and CSV to XLSX when you want a real Excel workbook rather than plain text.

How to convert

1. Drop your JSON file into the converter box at the top of this page, or click the box to select it.
2. The CSV is generated immediately — everything runs in your browser.
3. Click the download button that appears to save the CSV.

The conversion never leaves your device, so there's no upload step even for a large API response — works the same on desktop and mobile.

Why some JSON doesn't map cleanly to CSV

CSV is a flat grid — rows and columns, nothing more — but JSON supports nesting: objects inside objects, arrays inside objects, arrays of arrays. There's no standard way to fit a nested object into a single CSV cell, so a converter has to make a choice: flatten it into dot-notation columns like "address.city", or serialize the whole nested value into the cell as text. AllConvert does the latter for anything that isn't a flat key-value pair, which keeps the output predictable even for irregular data. Going the other direction is simpler: a CSV's rows map directly onto an array of JSON objects, one column per key, with no ambiguity about structure.

Frequently asked questions

What JSON format can be converted to CSV?
An array of flat objects works best: each object becomes a row and the keys become column headers. Nested values are serialized into their cell as text.

How do I open JSON data in Excel?
Convert the JSON to CSV with AllConvert, then open the CSV in Excel or Google Sheets. For a native Excel file, AllConvert can also convert JSON directly to XLSX.

Is my data sent to a server during conversion?
No. The conversion runs entirely in your browser using JavaScript, so API responses containing sensitive data never leave your device.