FileopiaConvert JSON to CSV
Convert JSON arrays to CSV. Nested objects are flattened to dot.keys; opens cleanly in Excel (UTF-8 BOM).
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- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: JSON to CSV
- Select a JSON file.
- Choose a delimiter.
- Download the CSV.
CSV opens in Excel, Google Sheets and Numbers, making it ideal for analysing API data or sharing it with non-developers.
Common uses
- Analyse API responses in a spreadsheet.
- Share app data with colleagues.
- Import JSON into tools that accept CSV.
Tips for best results
- Nested objects become dot.key columns.
- A UTF-8 BOM keeps accents correct in Excel.
Flattening nested data
APIs often return nested JSON. Spreadsheets need flat columns, so nested fields become dot-notation headers such as user.name or address.country. Arrays are written as text in one cell so nothing is lost.
Opening in Excel correctly
The file includes a UTF-8 byte order mark so Excel shows accents and non-Latin characters correctly. In Google Sheets, use File → Import to load the CSV.
Common sources
Exports from APIs, NoSQL databases, analytics tools and web scrapers are often JSON. Converting to CSV lets business teams review the data in familiar spreadsheet tools.
Why use Fileopia for JSON to CSV?
| Fileopia | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Your files never leave your device
JSON to CSV runs entirely in your browser using JavaScript and WebAssembly. Your files are read from your disk into this tab, processed in memory and saved straight back to your downloads folder – they are never uploaded to Fileopia or any third party.
- Test it yourself: once this page has loaded, switch off Wi‑Fi or mobile data and run the tool – it keeps working.
- Check the network: open your browser’s developer tools (F12 → Network) while processing; you will see no file upload requests.
- Nothing to delete: close the tab and the data is gone – there is no server copy, no retention period and no account.
Frequently asked questions
What input is supported?
A JSON array of objects, or an object containing such an array.
Are nested objects supported?
Yes, they become dot.key columns.
Is JSON to CSV really free?
Yes. Every tool on Fileopia is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. Fileopia processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. Fileopia works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.