Is my JSON uploaded to Convertr?

No. JSON parsing, flattening and CSV generation run in JavaScript in your browser. The JSON content and CSV output are not uploaded.

Can this converter handle nested JSON?

Yes. Nested objects are flattened with dot notation, such as user.name or billing.address.city.

How are JSON arrays converted to CSV?

Arrays can be kept as JSON text in one CSV cell or expanded into indexed columns. Arrays of objects can also become multiple CSV rows when they are the top-level value.

Can I convert one JSON object instead of an array?

Yes. A single JSON object becomes one CSV row. A top-level array of objects becomes multiple rows.

JSON to CSV Converter

Convert API responses, exported JSON files and nested objects into spreadsheet-ready CSV without uploading your data.

入力 JSON

0 文字

CSV output

CSV appears here. Everything runs in your browser.

準備ができて

Header preview

No rows converted yet

Column names appear after conversion.

Conversion options

Nested arrays CSV delimiter Include header row Use flattened JSON paths as CSV column names. Blank null values Export null and missing values as empty CSV cells.

Large JSON files depend on browser memory. The file never leaves your device, and analytics only receive row, column and error buckets.

Nested object flattening

Object paths become readable columns like customer.email, billing.city and metrics.revenue.

Spreadsheet-ready escaping

Commas, quotes, line breaks and Unicode values are escaped for CSV import in Excel, Sheets and BI tools.

プライベートなローカル処理

JSON.parse and CSV generation run on your device. No upload endpoint, API key or third-party processing is involved.