JSON ↔ CSV Converter

What does the JSON ↔ CSV Converter do?

It converts a JSON array of objects (or a single object) into a CSV file with a header row, and converts CSV data back into a JSON array of objects. Fields containing commas, quotes or newlines are correctly quoted per RFC-4180 rules.

When is it useful?

• Migrating data between databases, spreadsheets and APIs.
• Preparing CSV exports from API responses for Excel or Google Sheets.
• Converting spreadsheet data into JSON for configuration files and scripts.

Is my data safe?

Yes. All conversion happens in your browser; your data is never uploaded or stored. Use it for private lists, reports and configuration data without worry.

When are flat rows not enough?

CSV works best for tabular data where every record has the same fields. Deeply nested JSON — objects inside arrays inside objects — does not translate cleanly to rows. Flatten with explicit keys (like user.address.city) so no information is lost, and rebuild from CSV only when the structure allows it.

Column mapping matters

Check the generated columns before you import: empty arrays become missing columns, and nested objects become dotted keys. Spend one minute verifying the mapping, and your spreadsheet or database import runs without surprises.