Local data converter

Move structured data between developer-friendly JSON and spreadsheet-friendly CSV, with nested flattening, delimiter detection, type inference, previews, and exports that stay in your browser.

01 Local-only
02 Nested data ready
03 Excel-safe option
Flatten
Nested objects become columns

Turn address.city, metadata.created, and arrays into clean tabular output.

Detect
CSV delimiter handling

Auto-detect comma, tab, semicolon, or pipe-separated data.

Export
Copy or download results

Review the preview, then export clean JSON or CSV without uploading anything.

Input JSON
Load sample
Drop JSON file here
Output CSV