CSV to JSON Converter
Convert CSV to JSON and JSON to CSV with a single switch — free, private, in your browser.
✓ Your files never leave your device. Everything runs locally in your browser.
CSV and JSON are the two most common formats for moving tabular data. Developers need JSON for apps and APIs; analysts want CSV for spreadsheets. This converter handles both directions and runs entirely in your browser.
No data is uploaded — the parsing and re-serialisation happen on your device.
How it works
- Paste your data – Paste CSV or JSON into the input box (or switch direction first).
- Choose options – Pick the delimiter for CSV and whether the first row is a header.
- Convert – Click Convert to transform the data.
- Copy or download – Copy the result or download it as .csv / .json.
When to use which
- CSV for spreadsheets, exports and bulk import tools.
- JSON for web apps, APIs and nested data.
- CSV cannot represent nested structures — keep JSON for those.
Notes on CSV parsing
Commas inside quoted fields are handled correctly, and you can pick a semicolon, tab or pipe delimiter for European exports. With “first row is a header”, each row becomes a JSON object keyed by the column names.
Frequently asked questions
Is my data uploaded?
No. Conversion runs locally in your browser; nothing is sent to a server.
Does CSV support nested data?
No. CSV is flat; use JSON if your data has nested objects or arrays.
Which delimiter should I use?
Leave it on Auto-detect, or choose comma, semicolon, tab or pipe to match your file.
What if my JSON is an object, not an array?
A single object is wrapped into a one-row table when converting to CSV.
Related tools
Convert CSV or JSON now — free, private and without uploading your data.