JSON to CSV Converter

Convert JSON objects and arrays into CSV spreadsheets. Smart flattening, live preview, large files — all in your browser.

🔒 Runs entirely in your browser — your data never leaves this device. How we verify this.
Also try: CSV to JSON Scenarios All Tools

How to Convert JSON to CSV

  1. Paste your JSON into the input editor. Accepts arrays of objects, single objects, or nested structures.
  2. Choose options. Pick a delimiter, a nested-key style (dot or underscore), and toggle the header row.
  3. Click "Convert to CSV". The tool flattens nested keys, builds the CSV, and shows a live preview table.
  4. Download or copy the result — opens in Excel, Google Sheets, or any spreadsheet app.

FAQ

Is my data secure?

Yes. All conversion runs in your browser using JavaScript (and a Web Worker for large files). After the page's static assets finish loading, clicking Convert makes no network request and your input is never uploaded — verify it yourself in DevTools (F12) → Network. This is an ad-free, tracker-free tool page.

Does this handle nested JSON?

Yes. Nested objects flatten into columns using either dot keys (address.city) or underscore keys (address_city) — your choice. Arrays are stringified into a single cell so no data is lost.

What if my JSON has special characters?

CSV fields with commas, quotes, or newlines are wrapped and escaped per RFC 4180. Output is compatible with Excel, Google Sheets, and LibreOffice Calc.