Data

CSV to JSON Converter

Turn spreadsheet CSV exports into API-ready JSON on your device. Processing stays on your device.

How to Use

  1. Paste CSV or upload a .csv file.
  2. Confirm delimiter if needed.
  3. Convert and download JSON.

Key Features & Privacy Advantage

  • All processing happens locally in your browser. Your files are never uploaded to a server.
  • Papa Parse for robust CSV parsing.
  • Delimiter options.
  • Pretty JSON download.

Technical Breakdown

CSV looks simple until quoted commas and newlines appear. Papa Parse handles common edge cases and returns objects keyed by header row.

Large sheets parse in-memory — extremely wide or tall files may be slow. Prefer filtered exports when possible.

Frequently Asked Questions

Is my spreadsheet uploaded?

No. All processing happens locally in your browser. Your files are never uploaded to a server.

First row headers?

Yes — the header row becomes JSON object keys.

Semicolon CSVs?

Choose the matching delimiter option.

Nested JSON?

CSV is flat; nested structures need a different source format.